* [syzbot] [btrfs?] KASAN: slab-use-after-free Read in btrfs_cleanup_defrag_inodes
@ 2024-09-16 14:44 syzbot
2024-09-16 14:59 ` Filipe Manana
2024-09-16 16:00 ` syzbot
0 siblings, 2 replies; 5+ messages in thread
From: syzbot @ 2024-09-16 14:44 UTC (permalink / raw)
To: clm, dsterba, josef, linux-btrfs, linux-kernel, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: adfc3ded5c33 Merge tag 'for-6.12/io_uring-discard-20240913..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1013a29f980000
kernel config: https://syzkaller.appspot.com/x/.config?x=6f94136b4da4e897
dashboard link: https://syzkaller.appspot.com/bug?extid=ad7966ca1f5dd8b001b3
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/4d908436e309/disk-adfc3ded.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c7ab09b5ccee/vmlinux-adfc3ded.xz
kernel image: https://storage.googleapis.com/syzbot-assets/fa3017710376/bzImage-adfc3ded.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ad7966ca1f5dd8b001b3@syzkaller.appspotmail.com
BTRFS info (device loop3 state EA): last unmount of filesystem ed167579-eb65-4e76-9a50-61ac97e9b59d
==================================================================
BUG: KASAN: slab-use-after-free in rb_left_deepest_node lib/rbtree.c:595 [inline]
BUG: KASAN: slab-use-after-free in rb_first_postorder+0x69/0x90 lib/rbtree.c:628
Read of size 8 at addr ffff888056652010 by task syz-executor/11584
CPU: 1 UID: 0 PID: 11584 Comm: syz-executor Not tainted 6.11.0-syzkaller-02520-gadfc3ded5c33 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:93 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
print_address_description mm/kasan/report.c:377 [inline]
print_report+0x169/0x550 mm/kasan/report.c:488
kasan_report+0x143/0x180 mm/kasan/report.c:601
rb_left_deepest_node lib/rbtree.c:595 [inline]
rb_first_postorder+0x69/0x90 lib/rbtree.c:628
btrfs_cleanup_defrag_inodes+0x2f/0x80 fs/btrfs/defrag.c:212
close_ctree+0x2af/0xd20 fs/btrfs/disk-io.c:4256
generic_shutdown_super+0x139/0x2d0 fs/super.c:642
kill_anon_super+0x3b/0x70 fs/super.c:1237
btrfs_kill_super+0x41/0x50 fs/btrfs/super.c:2121
deactivate_locked_super+0xc4/0x130 fs/super.c:473
cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1373
task_work_run+0x24f/0x310 kernel/task_work.c:228
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0xa2f/0x27f0 kernel/exit.c:882
do_group_exit+0x207/0x2c0 kernel/exit.c:1031
__do_sys_exit_group kernel/exit.c:1042 [inline]
__se_sys_exit_group kernel/exit.c:1040 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1040
x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6e26d7def9
Code: Unable to access opcode bytes at 0x7f6e26d7decf.
RSP: 002b:00007ffc1e161938 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f6e26df0a86 RCX: 00007f6e26d7def9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000010 R08: 00007ffc1e15f6d6 R09: 00007ffc1e162bf0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc1e162bf0
R13: 00007f6e26df0a14 R14: 000055555899a4a8 R15: 00007ffc1e163cb0
</TASK>
Allocated by task 11:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
unpoison_slab_object mm/kasan/common.c:312 [inline]
__kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook mm/slub.c:3989 [inline]
slab_alloc_node mm/slub.c:4038 [inline]
kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4045
btrfs_add_inode_defrag+0x15c/0x790 fs/btrfs/defrag.c:136
inode_should_defrag fs/btrfs/inode.c:888 [inline]
cow_file_range+0x380/0x11f0 fs/btrfs/inode.c:1382
btrfs_run_delalloc_range+0x33d/0xf70 fs/btrfs/inode.c:2334
writepage_delalloc+0x482/0x7d0 fs/btrfs/extent_io.c:1192
extent_writepage fs/btrfs/extent_io.c:1454 [inline]
extent_write_cache_pages fs/btrfs/extent_io.c:2130 [inline]
btrfs_writepages+0x1157/0x2370 fs/btrfs/extent_io.c:2261
do_writepages+0x35d/0x870 mm/page-writeback.c:2683
__writeback_single_inode+0x14f/0x10d0 fs/fs-writeback.c:1658
writeback_sb_inodes+0x812/0x1370 fs/fs-writeback.c:1954
wb_writeback+0x41b/0xbd0 fs/fs-writeback.c:2134
wb_do_writeback fs/fs-writeback.c:2281 [inline]
wb_workfn+0x410/0x1090 fs/fs-writeback.c:2321
process_one_work kernel/workqueue.c:3231 [inline]
process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
worker_thread+0x870/0xd30 kernel/workqueue.c:3393
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Freed by task 11917:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579
poison_slab_object+0xe0/0x150 mm/kasan/common.c:240
__kasan_slab_free+0x37/0x60 mm/kasan/common.c:256
kasan_slab_free include/linux/kasan.h:184 [inline]
slab_free_hook mm/slub.c:2250 [inline]
slab_free mm/slub.c:4474 [inline]
kmem_cache_free+0x145/0x350 mm/slub.c:4549
btrfs_cleanup_defrag_inodes+0x51/0x80 fs/btrfs/defrag.c:214
btrfs_remount_cleanup fs/btrfs/super.c:1263 [inline]
btrfs_reconfigure+0x269c/0x2d40 fs/btrfs/super.c:1555
reconfigure_super+0x445/0x880 fs/super.c:1083
do_remount fs/namespace.c:3047 [inline]
path_mount+0xc22/0xfa0 fs/namespace.c:3826
do_mount fs/namespace.c:3847 [inline]
__do_sys_mount fs/namespace.c:4055 [inline]
__se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4032
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff888056652000
which belongs to the cache btrfs_inode_defrag of size 56
The buggy address is located 16 bytes inside of
freed 56-byte region [ffff888056652000, ffff888056652038)
The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x56652
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xfdffffff(slab)
raw: 00fff00000000000 ffff888030f77780 dead000000000122 0000000000000000
raw: 0000000000000000 00000000802e002e 00000001fdffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x152c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 62, tgid 62 (kworker/u8:4), ts 261251744217, free_ts 261164089851
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1500
prep_new_page mm/page_alloc.c:1508 [inline]
get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3446
__alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4702
__alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
alloc_slab_page+0x5f/0x120 mm/slub.c:2319
allocate_slab+0x5a/0x2f0 mm/slub.c:2482
new_slab mm/slub.c:2535 [inline]
___slab_alloc+0xcd1/0x14b0 mm/slub.c:3721
__slab_alloc+0x58/0xa0 mm/slub.c:3811
__slab_alloc_node mm/slub.c:3864 [inline]
slab_alloc_node mm/slub.c:4026 [inline]
kmem_cache_alloc_noprof+0x1c1/0x2a0 mm/slub.c:4045
btrfs_add_inode_defrag+0x15c/0x790 fs/btrfs/defrag.c:136
inode_should_defrag fs/btrfs/inode.c:888 [inline]
compress_file_range+0x2ef/0x1300 fs/btrfs/inode.c:945
btrfs_work_helper+0x390/0xc50 fs/btrfs/async-thread.c:314
process_one_work kernel/workqueue.c:3231 [inline]
process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
worker_thread+0x870/0xd30 kernel/workqueue.c:3393
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
page last free pid 7513 tgid 7512 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1101 [inline]
free_unref_page+0xd19/0xea0 mm/page_alloc.c:2619
stack_depot_save_flags+0x6f6/0x830 lib/stackdepot.c:666
kasan_save_stack mm/kasan/common.c:48 [inline]
kasan_save_track+0x51/0x80 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
__kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387
kasan_kmalloc include/linux/kasan.h:211 [inline]
__do_kmalloc_node mm/slub.c:4159 [inline]
__kmalloc_noprof+0x1fc/0x400 mm/slub.c:4171
kmalloc_noprof include/linux/slab.h:694 [inline]
hfsplus_find_init+0x85/0x1c0 fs/hfsplus/bfind.c:21
hfsplus_lookup+0x1ae/0xc70 fs/hfsplus/dir.c:44
lookup_one_qstr_excl+0x11f/0x260 fs/namei.c:1633
filename_create+0x297/0x540 fs/namei.c:4027
do_mkdirat+0xbd/0x3a0 fs/namei.c:4272
__do_sys_mkdirat fs/namei.c:4295 [inline]
__se_sys_mkdirat fs/namei.c:4293 [inline]
__x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4293
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff888056651f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888056651f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888056652000: fa fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc
^
ffff888056652080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888056652100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
---
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syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
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If you want to overwrite report's subsystems, reply with:
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If the report is a duplicate of another one, reply with:
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If you want to undo deduplication, reply with:
#syz undup
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [syzbot] [btrfs?] KASAN: slab-use-after-free Read in btrfs_cleanup_defrag_inodes
2024-09-16 14:44 [syzbot] [btrfs?] KASAN: slab-use-after-free Read in btrfs_cleanup_defrag_inodes syzbot
@ 2024-09-16 14:59 ` Filipe Manana
2024-09-16 14:59 ` syzbot
2024-09-16 16:00 ` syzbot
1 sibling, 1 reply; 5+ messages in thread
From: Filipe Manana @ 2024-09-16 14:59 UTC (permalink / raw)
To: syzbot; +Cc: clm, dsterba, josef, linux-btrfs, linux-kernel, syzkaller-bugs
On Mon, Sep 16, 2024 at 3:44 PM syzbot
<syzbot+ad7966ca1f5dd8b001b3@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: adfc3ded5c33 Merge tag 'for-6.12/io_uring-discard-20240913..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=1013a29f980000
> kernel config: https://syzkaller.appspot.com/x/.config?x=6f94136b4da4e897
> dashboard link: https://syzkaller.appspot.com/bug?extid=ad7966ca1f5dd8b001b3
> compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
>
> Unfortunately, I don't have any reproducer for this issue yet.
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/4d908436e309/disk-adfc3ded.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/c7ab09b5ccee/vmlinux-adfc3ded.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/fa3017710376/bzImage-adfc3ded.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+ad7966ca1f5dd8b001b3@syzkaller.appspotmail.com
>
> BTRFS info (device loop3 state EA): last unmount of filesystem ed167579-eb65-4e76-9a50-61ac97e9b59d
> ==================================================================
> BUG: KASAN: slab-use-after-free in rb_left_deepest_node lib/rbtree.c:595 [inline]
> BUG: KASAN: slab-use-after-free in rb_first_postorder+0x69/0x90 lib/rbtree.c:628
> Read of size 8 at addr ffff888056652010 by task syz-executor/11584
>
> CPU: 1 UID: 0 PID: 11584 Comm: syz-executor Not tainted 6.11.0-syzkaller-02520-gadfc3ded5c33 #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
> Call Trace:
> <TASK>
> __dump_stack lib/dump_stack.c:93 [inline]
> dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
> print_address_description mm/kasan/report.c:377 [inline]
> print_report+0x169/0x550 mm/kasan/report.c:488
> kasan_report+0x143/0x180 mm/kasan/report.c:601
> rb_left_deepest_node lib/rbtree.c:595 [inline]
> rb_first_postorder+0x69/0x90 lib/rbtree.c:628
> btrfs_cleanup_defrag_inodes+0x2f/0x80 fs/btrfs/defrag.c:212
> close_ctree+0x2af/0xd20 fs/btrfs/disk-io.c:4256
> generic_shutdown_super+0x139/0x2d0 fs/super.c:642
> kill_anon_super+0x3b/0x70 fs/super.c:1237
> btrfs_kill_super+0x41/0x50 fs/btrfs/super.c:2121
> deactivate_locked_super+0xc4/0x130 fs/super.c:473
> cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1373
> task_work_run+0x24f/0x310 kernel/task_work.c:228
> exit_task_work include/linux/task_work.h:40 [inline]
> do_exit+0xa2f/0x27f0 kernel/exit.c:882
> do_group_exit+0x207/0x2c0 kernel/exit.c:1031
> __do_sys_exit_group kernel/exit.c:1042 [inline]
> __se_sys_exit_group kernel/exit.c:1040 [inline]
> __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1040
> x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232
> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7f6e26d7def9
> Code: Unable to access opcode bytes at 0x7f6e26d7decf.
> RSP: 002b:00007ffc1e161938 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
> RAX: ffffffffffffffda RBX: 00007f6e26df0a86 RCX: 00007f6e26d7def9
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
> RBP: 0000000000000010 R08: 00007ffc1e15f6d6 R09: 00007ffc1e162bf0
> R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc1e162bf0
> R13: 00007f6e26df0a14 R14: 000055555899a4a8 R15: 00007ffc1e163cb0
> </TASK>
>
> Allocated by task 11:
> kasan_save_stack mm/kasan/common.c:47 [inline]
> kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
> unpoison_slab_object mm/kasan/common.c:312 [inline]
> __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338
> kasan_slab_alloc include/linux/kasan.h:201 [inline]
> slab_post_alloc_hook mm/slub.c:3989 [inline]
> slab_alloc_node mm/slub.c:4038 [inline]
> kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4045
> btrfs_add_inode_defrag+0x15c/0x790 fs/btrfs/defrag.c:136
> inode_should_defrag fs/btrfs/inode.c:888 [inline]
> cow_file_range+0x380/0x11f0 fs/btrfs/inode.c:1382
> btrfs_run_delalloc_range+0x33d/0xf70 fs/btrfs/inode.c:2334
> writepage_delalloc+0x482/0x7d0 fs/btrfs/extent_io.c:1192
> extent_writepage fs/btrfs/extent_io.c:1454 [inline]
> extent_write_cache_pages fs/btrfs/extent_io.c:2130 [inline]
> btrfs_writepages+0x1157/0x2370 fs/btrfs/extent_io.c:2261
> do_writepages+0x35d/0x870 mm/page-writeback.c:2683
> __writeback_single_inode+0x14f/0x10d0 fs/fs-writeback.c:1658
> writeback_sb_inodes+0x812/0x1370 fs/fs-writeback.c:1954
> wb_writeback+0x41b/0xbd0 fs/fs-writeback.c:2134
> wb_do_writeback fs/fs-writeback.c:2281 [inline]
> wb_workfn+0x410/0x1090 fs/fs-writeback.c:2321
> process_one_work kernel/workqueue.c:3231 [inline]
> process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
> worker_thread+0x870/0xd30 kernel/workqueue.c:3393
> kthread+0x2f0/0x390 kernel/kthread.c:389
> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
> ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
>
> Freed by task 11917:
> kasan_save_stack mm/kasan/common.c:47 [inline]
> kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
> kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579
> poison_slab_object+0xe0/0x150 mm/kasan/common.c:240
> __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256
> kasan_slab_free include/linux/kasan.h:184 [inline]
> slab_free_hook mm/slub.c:2250 [inline]
> slab_free mm/slub.c:4474 [inline]
> kmem_cache_free+0x145/0x350 mm/slub.c:4549
> btrfs_cleanup_defrag_inodes+0x51/0x80 fs/btrfs/defrag.c:214
> btrfs_remount_cleanup fs/btrfs/super.c:1263 [inline]
> btrfs_reconfigure+0x269c/0x2d40 fs/btrfs/super.c:1555
> reconfigure_super+0x445/0x880 fs/super.c:1083
> do_remount fs/namespace.c:3047 [inline]
> path_mount+0xc22/0xfa0 fs/namespace.c:3826
> do_mount fs/namespace.c:3847 [inline]
> __do_sys_mount fs/namespace.c:4055 [inline]
> __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4032
> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
>
> The buggy address belongs to the object at ffff888056652000
> which belongs to the cache btrfs_inode_defrag of size 56
> The buggy address is located 16 bytes inside of
> freed 56-byte region [ffff888056652000, ffff888056652038)
>
> The buggy address belongs to the physical page:
> page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x56652
> flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
> page_type: 0xfdffffff(slab)
> raw: 00fff00000000000 ffff888030f77780 dead000000000122 0000000000000000
> raw: 0000000000000000 00000000802e002e 00000001fdffffff 0000000000000000
> page dumped because: kasan: bad access detected
> page_owner tracks the page as allocated
> page last allocated via order 0, migratetype Unmovable, gfp_mask 0x152c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 62, tgid 62 (kworker/u8:4), ts 261251744217, free_ts 261164089851
> set_page_owner include/linux/page_owner.h:32 [inline]
> post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1500
> prep_new_page mm/page_alloc.c:1508 [inline]
> get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3446
> __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4702
> __alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
> alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
> alloc_slab_page+0x5f/0x120 mm/slub.c:2319
> allocate_slab+0x5a/0x2f0 mm/slub.c:2482
> new_slab mm/slub.c:2535 [inline]
> ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3721
> __slab_alloc+0x58/0xa0 mm/slub.c:3811
> __slab_alloc_node mm/slub.c:3864 [inline]
> slab_alloc_node mm/slub.c:4026 [inline]
> kmem_cache_alloc_noprof+0x1c1/0x2a0 mm/slub.c:4045
> btrfs_add_inode_defrag+0x15c/0x790 fs/btrfs/defrag.c:136
> inode_should_defrag fs/btrfs/inode.c:888 [inline]
> compress_file_range+0x2ef/0x1300 fs/btrfs/inode.c:945
> btrfs_work_helper+0x390/0xc50 fs/btrfs/async-thread.c:314
> process_one_work kernel/workqueue.c:3231 [inline]
> process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
> worker_thread+0x870/0xd30 kernel/workqueue.c:3393
> kthread+0x2f0/0x390 kernel/kthread.c:389
> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
> ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
> page last free pid 7513 tgid 7512 stack trace:
> reset_page_owner include/linux/page_owner.h:25 [inline]
> free_pages_prepare mm/page_alloc.c:1101 [inline]
> free_unref_page+0xd19/0xea0 mm/page_alloc.c:2619
> stack_depot_save_flags+0x6f6/0x830 lib/stackdepot.c:666
> kasan_save_stack mm/kasan/common.c:48 [inline]
> kasan_save_track+0x51/0x80 mm/kasan/common.c:68
> poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
> __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387
> kasan_kmalloc include/linux/kasan.h:211 [inline]
> __do_kmalloc_node mm/slub.c:4159 [inline]
> __kmalloc_noprof+0x1fc/0x400 mm/slub.c:4171
> kmalloc_noprof include/linux/slab.h:694 [inline]
> hfsplus_find_init+0x85/0x1c0 fs/hfsplus/bfind.c:21
> hfsplus_lookup+0x1ae/0xc70 fs/hfsplus/dir.c:44
> lookup_one_qstr_excl+0x11f/0x260 fs/namei.c:1633
> filename_create+0x297/0x540 fs/namei.c:4027
> do_mkdirat+0xbd/0x3a0 fs/namei.c:4272
> __do_sys_mkdirat fs/namei.c:4295 [inline]
> __se_sys_mkdirat fs/namei.c:4293 [inline]
> __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4293
> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
>
> Memory state around the buggy address:
> ffff888056651f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ffff888056651f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> >ffff888056652000: fa fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc
> ^
> ffff888056652080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> ffff888056652100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> ==================================================================
>
>
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@googlegroups.com.
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>
> If the report is already addressed, let syzbot know by replying with:
> #syz fix: exact-commit-title
#syz btrfs: fix use-after-free on rbtree that tracks inodes for auto defrag
https://lore.kernel.org/linux-btrfs/743f120462032370c7ae8ff899bfd8dbfb0ed006.1726486545.git.fdmanana@suse.com/
>
> If you want to overwrite report's subsystems, reply with:
> #syz set subsystems: new-subsystem
> (See the list of subsystem names on the web dashboard)
>
> If the report is a duplicate of another one, reply with:
> #syz dup: exact-subject-of-another-report
>
> If you want to undo deduplication, reply with:
> #syz undup
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [syzbot] [btrfs?] KASAN: slab-use-after-free Read in btrfs_cleanup_defrag_inodes
2024-09-16 14:59 ` Filipe Manana
@ 2024-09-16 14:59 ` syzbot
2024-09-16 15:01 ` Filipe Manana
0 siblings, 1 reply; 5+ messages in thread
From: syzbot @ 2024-09-16 14:59 UTC (permalink / raw)
To: fdmanana
Cc: clm, dsterba, fdmanana, josef, linux-btrfs, linux-kernel,
syzkaller-bugs
> On Mon, Sep 16, 2024 at 3:44 PM syzbot
> <syzbot+ad7966ca1f5dd8b001b3@syzkaller.appspotmail.com> wrote:
>>
>> Hello,
>>
>> syzbot found the following issue on:
>>
>> HEAD commit: adfc3ded5c33 Merge tag 'for-6.12/io_uring-discard-20240913..
>> git tree: upstream
>> console output: https://syzkaller.appspot.com/x/log.txt?x=1013a29f980000
>> kernel config: https://syzkaller.appspot.com/x/.config?x=6f94136b4da4e897
>> dashboard link: https://syzkaller.appspot.com/bug?extid=ad7966ca1f5dd8b001b3
>> compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
>>
>> Unfortunately, I don't have any reproducer for this issue yet.
>>
>> Downloadable assets:
>> disk image: https://storage.googleapis.com/syzbot-assets/4d908436e309/disk-adfc3ded.raw.xz
>> vmlinux: https://storage.googleapis.com/syzbot-assets/c7ab09b5ccee/vmlinux-adfc3ded.xz
>> kernel image: https://storage.googleapis.com/syzbot-assets/fa3017710376/bzImage-adfc3ded.xz
>>
>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>> Reported-by: syzbot+ad7966ca1f5dd8b001b3@syzkaller.appspotmail.com
>>
>> BTRFS info (device loop3 state EA): last unmount of filesystem ed167579-eb65-4e76-9a50-61ac97e9b59d
>> ==================================================================
>> BUG: KASAN: slab-use-after-free in rb_left_deepest_node lib/rbtree.c:595 [inline]
>> BUG: KASAN: slab-use-after-free in rb_first_postorder+0x69/0x90 lib/rbtree.c:628
>> Read of size 8 at addr ffff888056652010 by task syz-executor/11584
>>
>> CPU: 1 UID: 0 PID: 11584 Comm: syz-executor Not tainted 6.11.0-syzkaller-02520-gadfc3ded5c33 #0
>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
>> Call Trace:
>> <TASK>
>> __dump_stack lib/dump_stack.c:93 [inline]
>> dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
>> print_address_description mm/kasan/report.c:377 [inline]
>> print_report+0x169/0x550 mm/kasan/report.c:488
>> kasan_report+0x143/0x180 mm/kasan/report.c:601
>> rb_left_deepest_node lib/rbtree.c:595 [inline]
>> rb_first_postorder+0x69/0x90 lib/rbtree.c:628
>> btrfs_cleanup_defrag_inodes+0x2f/0x80 fs/btrfs/defrag.c:212
>> close_ctree+0x2af/0xd20 fs/btrfs/disk-io.c:4256
>> generic_shutdown_super+0x139/0x2d0 fs/super.c:642
>> kill_anon_super+0x3b/0x70 fs/super.c:1237
>> btrfs_kill_super+0x41/0x50 fs/btrfs/super.c:2121
>> deactivate_locked_super+0xc4/0x130 fs/super.c:473
>> cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1373
>> task_work_run+0x24f/0x310 kernel/task_work.c:228
>> exit_task_work include/linux/task_work.h:40 [inline]
>> do_exit+0xa2f/0x27f0 kernel/exit.c:882
>> do_group_exit+0x207/0x2c0 kernel/exit.c:1031
>> __do_sys_exit_group kernel/exit.c:1042 [inline]
>> __se_sys_exit_group kernel/exit.c:1040 [inline]
>> __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1040
>> x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232
>> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
>> do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
>> entry_SYSCALL_64_after_hwframe+0x77/0x7f
>> RIP: 0033:0x7f6e26d7def9
>> Code: Unable to access opcode bytes at 0x7f6e26d7decf.
>> RSP: 002b:00007ffc1e161938 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
>> RAX: ffffffffffffffda RBX: 00007f6e26df0a86 RCX: 00007f6e26d7def9
>> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
>> RBP: 0000000000000010 R08: 00007ffc1e15f6d6 R09: 00007ffc1e162bf0
>> R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc1e162bf0
>> R13: 00007f6e26df0a14 R14: 000055555899a4a8 R15: 00007ffc1e163cb0
>> </TASK>
>>
>> Allocated by task 11:
>> kasan_save_stack mm/kasan/common.c:47 [inline]
>> kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
>> unpoison_slab_object mm/kasan/common.c:312 [inline]
>> __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338
>> kasan_slab_alloc include/linux/kasan.h:201 [inline]
>> slab_post_alloc_hook mm/slub.c:3989 [inline]
>> slab_alloc_node mm/slub.c:4038 [inline]
>> kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4045
>> btrfs_add_inode_defrag+0x15c/0x790 fs/btrfs/defrag.c:136
>> inode_should_defrag fs/btrfs/inode.c:888 [inline]
>> cow_file_range+0x380/0x11f0 fs/btrfs/inode.c:1382
>> btrfs_run_delalloc_range+0x33d/0xf70 fs/btrfs/inode.c:2334
>> writepage_delalloc+0x482/0x7d0 fs/btrfs/extent_io.c:1192
>> extent_writepage fs/btrfs/extent_io.c:1454 [inline]
>> extent_write_cache_pages fs/btrfs/extent_io.c:2130 [inline]
>> btrfs_writepages+0x1157/0x2370 fs/btrfs/extent_io.c:2261
>> do_writepages+0x35d/0x870 mm/page-writeback.c:2683
>> __writeback_single_inode+0x14f/0x10d0 fs/fs-writeback.c:1658
>> writeback_sb_inodes+0x812/0x1370 fs/fs-writeback.c:1954
>> wb_writeback+0x41b/0xbd0 fs/fs-writeback.c:2134
>> wb_do_writeback fs/fs-writeback.c:2281 [inline]
>> wb_workfn+0x410/0x1090 fs/fs-writeback.c:2321
>> process_one_work kernel/workqueue.c:3231 [inline]
>> process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
>> worker_thread+0x870/0xd30 kernel/workqueue.c:3393
>> kthread+0x2f0/0x390 kernel/kthread.c:389
>> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
>> ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
>>
>> Freed by task 11917:
>> kasan_save_stack mm/kasan/common.c:47 [inline]
>> kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
>> kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579
>> poison_slab_object+0xe0/0x150 mm/kasan/common.c:240
>> __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256
>> kasan_slab_free include/linux/kasan.h:184 [inline]
>> slab_free_hook mm/slub.c:2250 [inline]
>> slab_free mm/slub.c:4474 [inline]
>> kmem_cache_free+0x145/0x350 mm/slub.c:4549
>> btrfs_cleanup_defrag_inodes+0x51/0x80 fs/btrfs/defrag.c:214
>> btrfs_remount_cleanup fs/btrfs/super.c:1263 [inline]
>> btrfs_reconfigure+0x269c/0x2d40 fs/btrfs/super.c:1555
>> reconfigure_super+0x445/0x880 fs/super.c:1083
>> do_remount fs/namespace.c:3047 [inline]
>> path_mount+0xc22/0xfa0 fs/namespace.c:3826
>> do_mount fs/namespace.c:3847 [inline]
>> __do_sys_mount fs/namespace.c:4055 [inline]
>> __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4032
>> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
>> do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
>> entry_SYSCALL_64_after_hwframe+0x77/0x7f
>>
>> The buggy address belongs to the object at ffff888056652000
>> which belongs to the cache btrfs_inode_defrag of size 56
>> The buggy address is located 16 bytes inside of
>> freed 56-byte region [ffff888056652000, ffff888056652038)
>>
>> The buggy address belongs to the physical page:
>> page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x56652
>> flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
>> page_type: 0xfdffffff(slab)
>> raw: 00fff00000000000 ffff888030f77780 dead000000000122 0000000000000000
>> raw: 0000000000000000 00000000802e002e 00000001fdffffff 0000000000000000
>> page dumped because: kasan: bad access detected
>> page_owner tracks the page as allocated
>> page last allocated via order 0, migratetype Unmovable, gfp_mask 0x152c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 62, tgid 62 (kworker/u8:4), ts 261251744217, free_ts 261164089851
>> set_page_owner include/linux/page_owner.h:32 [inline]
>> post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1500
>> prep_new_page mm/page_alloc.c:1508 [inline]
>> get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3446
>> __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4702
>> __alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
>> alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
>> alloc_slab_page+0x5f/0x120 mm/slub.c:2319
>> allocate_slab+0x5a/0x2f0 mm/slub.c:2482
>> new_slab mm/slub.c:2535 [inline]
>> ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3721
>> __slab_alloc+0x58/0xa0 mm/slub.c:3811
>> __slab_alloc_node mm/slub.c:3864 [inline]
>> slab_alloc_node mm/slub.c:4026 [inline]
>> kmem_cache_alloc_noprof+0x1c1/0x2a0 mm/slub.c:4045
>> btrfs_add_inode_defrag+0x15c/0x790 fs/btrfs/defrag.c:136
>> inode_should_defrag fs/btrfs/inode.c:888 [inline]
>> compress_file_range+0x2ef/0x1300 fs/btrfs/inode.c:945
>> btrfs_work_helper+0x390/0xc50 fs/btrfs/async-thread.c:314
>> process_one_work kernel/workqueue.c:3231 [inline]
>> process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
>> worker_thread+0x870/0xd30 kernel/workqueue.c:3393
>> kthread+0x2f0/0x390 kernel/kthread.c:389
>> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
>> ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
>> page last free pid 7513 tgid 7512 stack trace:
>> reset_page_owner include/linux/page_owner.h:25 [inline]
>> free_pages_prepare mm/page_alloc.c:1101 [inline]
>> free_unref_page+0xd19/0xea0 mm/page_alloc.c:2619
>> stack_depot_save_flags+0x6f6/0x830 lib/stackdepot.c:666
>> kasan_save_stack mm/kasan/common.c:48 [inline]
>> kasan_save_track+0x51/0x80 mm/kasan/common.c:68
>> poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
>> __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387
>> kasan_kmalloc include/linux/kasan.h:211 [inline]
>> __do_kmalloc_node mm/slub.c:4159 [inline]
>> __kmalloc_noprof+0x1fc/0x400 mm/slub.c:4171
>> kmalloc_noprof include/linux/slab.h:694 [inline]
>> hfsplus_find_init+0x85/0x1c0 fs/hfsplus/bfind.c:21
>> hfsplus_lookup+0x1ae/0xc70 fs/hfsplus/dir.c:44
>> lookup_one_qstr_excl+0x11f/0x260 fs/namei.c:1633
>> filename_create+0x297/0x540 fs/namei.c:4027
>> do_mkdirat+0xbd/0x3a0 fs/namei.c:4272
>> __do_sys_mkdirat fs/namei.c:4295 [inline]
>> __se_sys_mkdirat fs/namei.c:4293 [inline]
>> __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4293
>> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
>> do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
>> entry_SYSCALL_64_after_hwframe+0x77/0x7f
>>
>> Memory state around the buggy address:
>> ffff888056651f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> ffff888056651f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> >ffff888056652000: fa fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc
>> ^
>> ffff888056652080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>> ffff888056652100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>> ==================================================================
>>
>>
>> ---
>> This report is generated by a bot. It may contain errors.
>> See https://goo.gl/tpsmEJ for more information about syzbot.
>> syzbot engineers can be reached at syzkaller@googlegroups.com.
>>
>> syzbot will keep track of this issue. See:
>> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>>
>> If the report is already addressed, let syzbot know by replying with:
>> #syz fix: exact-commit-title
>
> #syz btrfs: fix use-after-free on rbtree that tracks inodes for auto defrag
unknown command "btrfs:"
>
> https://lore.kernel.org/linux-btrfs/743f120462032370c7ae8ff899bfd8dbfb0ed006.1726486545.git.fdmanana@suse.com/
>
>>
>> If you want to overwrite report's subsystems, reply with:
>> #syz set subsystems: new-subsystem
>> (See the list of subsystem names on the web dashboard)
>>
>> If the report is a duplicate of another one, reply with:
>> #syz dup: exact-subject-of-another-report
>>
>> If you want to undo deduplication, reply with:
>> #syz undup
>>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [syzbot] [btrfs?] KASAN: slab-use-after-free Read in btrfs_cleanup_defrag_inodes
2024-09-16 14:59 ` syzbot
@ 2024-09-16 15:01 ` Filipe Manana
0 siblings, 0 replies; 5+ messages in thread
From: Filipe Manana @ 2024-09-16 15:01 UTC (permalink / raw)
To: syzbot; +Cc: clm, dsterba, josef, linux-btrfs, linux-kernel, syzkaller-bugs
On Mon, Sep 16, 2024 at 3:59 PM syzbot
<syzbot+ad7966ca1f5dd8b001b3@syzkaller.appspotmail.com> wrote:
>
> > On Mon, Sep 16, 2024 at 3:44 PM syzbot
> > <syzbot+ad7966ca1f5dd8b001b3@syzkaller.appspotmail.com> wrote:
> >>
> >> Hello,
> >>
> >> syzbot found the following issue on:
> >>
> >> HEAD commit: adfc3ded5c33 Merge tag 'for-6.12/io_uring-discard-20240913..
> >> git tree: upstream
> >> console output: https://syzkaller.appspot.com/x/log.txt?x=1013a29f980000
> >> kernel config: https://syzkaller.appspot.com/x/.config?x=6f94136b4da4e897
> >> dashboard link: https://syzkaller.appspot.com/bug?extid=ad7966ca1f5dd8b001b3
> >> compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> >>
> >> Unfortunately, I don't have any reproducer for this issue yet.
> >>
> >> Downloadable assets:
> >> disk image: https://storage.googleapis.com/syzbot-assets/4d908436e309/disk-adfc3ded.raw.xz
> >> vmlinux: https://storage.googleapis.com/syzbot-assets/c7ab09b5ccee/vmlinux-adfc3ded.xz
> >> kernel image: https://storage.googleapis.com/syzbot-assets/fa3017710376/bzImage-adfc3ded.xz
> >>
> >> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> >> Reported-by: syzbot+ad7966ca1f5dd8b001b3@syzkaller.appspotmail.com
> >>
> >> BTRFS info (device loop3 state EA): last unmount of filesystem ed167579-eb65-4e76-9a50-61ac97e9b59d
> >> ==================================================================
> >> BUG: KASAN: slab-use-after-free in rb_left_deepest_node lib/rbtree.c:595 [inline]
> >> BUG: KASAN: slab-use-after-free in rb_first_postorder+0x69/0x90 lib/rbtree.c:628
> >> Read of size 8 at addr ffff888056652010 by task syz-executor/11584
> >>
> >> CPU: 1 UID: 0 PID: 11584 Comm: syz-executor Not tainted 6.11.0-syzkaller-02520-gadfc3ded5c33 #0
> >> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
> >> Call Trace:
> >> <TASK>
> >> __dump_stack lib/dump_stack.c:93 [inline]
> >> dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
> >> print_address_description mm/kasan/report.c:377 [inline]
> >> print_report+0x169/0x550 mm/kasan/report.c:488
> >> kasan_report+0x143/0x180 mm/kasan/report.c:601
> >> rb_left_deepest_node lib/rbtree.c:595 [inline]
> >> rb_first_postorder+0x69/0x90 lib/rbtree.c:628
> >> btrfs_cleanup_defrag_inodes+0x2f/0x80 fs/btrfs/defrag.c:212
> >> close_ctree+0x2af/0xd20 fs/btrfs/disk-io.c:4256
> >> generic_shutdown_super+0x139/0x2d0 fs/super.c:642
> >> kill_anon_super+0x3b/0x70 fs/super.c:1237
> >> btrfs_kill_super+0x41/0x50 fs/btrfs/super.c:2121
> >> deactivate_locked_super+0xc4/0x130 fs/super.c:473
> >> cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1373
> >> task_work_run+0x24f/0x310 kernel/task_work.c:228
> >> exit_task_work include/linux/task_work.h:40 [inline]
> >> do_exit+0xa2f/0x27f0 kernel/exit.c:882
> >> do_group_exit+0x207/0x2c0 kernel/exit.c:1031
> >> __do_sys_exit_group kernel/exit.c:1042 [inline]
> >> __se_sys_exit_group kernel/exit.c:1040 [inline]
> >> __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1040
> >> x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232
> >> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> >> do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
> >> entry_SYSCALL_64_after_hwframe+0x77/0x7f
> >> RIP: 0033:0x7f6e26d7def9
> >> Code: Unable to access opcode bytes at 0x7f6e26d7decf.
> >> RSP: 002b:00007ffc1e161938 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
> >> RAX: ffffffffffffffda RBX: 00007f6e26df0a86 RCX: 00007f6e26d7def9
> >> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
> >> RBP: 0000000000000010 R08: 00007ffc1e15f6d6 R09: 00007ffc1e162bf0
> >> R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc1e162bf0
> >> R13: 00007f6e26df0a14 R14: 000055555899a4a8 R15: 00007ffc1e163cb0
> >> </TASK>
> >>
> >> Allocated by task 11:
> >> kasan_save_stack mm/kasan/common.c:47 [inline]
> >> kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
> >> unpoison_slab_object mm/kasan/common.c:312 [inline]
> >> __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338
> >> kasan_slab_alloc include/linux/kasan.h:201 [inline]
> >> slab_post_alloc_hook mm/slub.c:3989 [inline]
> >> slab_alloc_node mm/slub.c:4038 [inline]
> >> kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4045
> >> btrfs_add_inode_defrag+0x15c/0x790 fs/btrfs/defrag.c:136
> >> inode_should_defrag fs/btrfs/inode.c:888 [inline]
> >> cow_file_range+0x380/0x11f0 fs/btrfs/inode.c:1382
> >> btrfs_run_delalloc_range+0x33d/0xf70 fs/btrfs/inode.c:2334
> >> writepage_delalloc+0x482/0x7d0 fs/btrfs/extent_io.c:1192
> >> extent_writepage fs/btrfs/extent_io.c:1454 [inline]
> >> extent_write_cache_pages fs/btrfs/extent_io.c:2130 [inline]
> >> btrfs_writepages+0x1157/0x2370 fs/btrfs/extent_io.c:2261
> >> do_writepages+0x35d/0x870 mm/page-writeback.c:2683
> >> __writeback_single_inode+0x14f/0x10d0 fs/fs-writeback.c:1658
> >> writeback_sb_inodes+0x812/0x1370 fs/fs-writeback.c:1954
> >> wb_writeback+0x41b/0xbd0 fs/fs-writeback.c:2134
> >> wb_do_writeback fs/fs-writeback.c:2281 [inline]
> >> wb_workfn+0x410/0x1090 fs/fs-writeback.c:2321
> >> process_one_work kernel/workqueue.c:3231 [inline]
> >> process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
> >> worker_thread+0x870/0xd30 kernel/workqueue.c:3393
> >> kthread+0x2f0/0x390 kernel/kthread.c:389
> >> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
> >> ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
> >>
> >> Freed by task 11917:
> >> kasan_save_stack mm/kasan/common.c:47 [inline]
> >> kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
> >> kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579
> >> poison_slab_object+0xe0/0x150 mm/kasan/common.c:240
> >> __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256
> >> kasan_slab_free include/linux/kasan.h:184 [inline]
> >> slab_free_hook mm/slub.c:2250 [inline]
> >> slab_free mm/slub.c:4474 [inline]
> >> kmem_cache_free+0x145/0x350 mm/slub.c:4549
> >> btrfs_cleanup_defrag_inodes+0x51/0x80 fs/btrfs/defrag.c:214
> >> btrfs_remount_cleanup fs/btrfs/super.c:1263 [inline]
> >> btrfs_reconfigure+0x269c/0x2d40 fs/btrfs/super.c:1555
> >> reconfigure_super+0x445/0x880 fs/super.c:1083
> >> do_remount fs/namespace.c:3047 [inline]
> >> path_mount+0xc22/0xfa0 fs/namespace.c:3826
> >> do_mount fs/namespace.c:3847 [inline]
> >> __do_sys_mount fs/namespace.c:4055 [inline]
> >> __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4032
> >> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> >> do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
> >> entry_SYSCALL_64_after_hwframe+0x77/0x7f
> >>
> >> The buggy address belongs to the object at ffff888056652000
> >> which belongs to the cache btrfs_inode_defrag of size 56
> >> The buggy address is located 16 bytes inside of
> >> freed 56-byte region [ffff888056652000, ffff888056652038)
> >>
> >> The buggy address belongs to the physical page:
> >> page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x56652
> >> flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
> >> page_type: 0xfdffffff(slab)
> >> raw: 00fff00000000000 ffff888030f77780 dead000000000122 0000000000000000
> >> raw: 0000000000000000 00000000802e002e 00000001fdffffff 0000000000000000
> >> page dumped because: kasan: bad access detected
> >> page_owner tracks the page as allocated
> >> page last allocated via order 0, migratetype Unmovable, gfp_mask 0x152c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 62, tgid 62 (kworker/u8:4), ts 261251744217, free_ts 261164089851
> >> set_page_owner include/linux/page_owner.h:32 [inline]
> >> post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1500
> >> prep_new_page mm/page_alloc.c:1508 [inline]
> >> get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3446
> >> __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4702
> >> __alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
> >> alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
> >> alloc_slab_page+0x5f/0x120 mm/slub.c:2319
> >> allocate_slab+0x5a/0x2f0 mm/slub.c:2482
> >> new_slab mm/slub.c:2535 [inline]
> >> ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3721
> >> __slab_alloc+0x58/0xa0 mm/slub.c:3811
> >> __slab_alloc_node mm/slub.c:3864 [inline]
> >> slab_alloc_node mm/slub.c:4026 [inline]
> >> kmem_cache_alloc_noprof+0x1c1/0x2a0 mm/slub.c:4045
> >> btrfs_add_inode_defrag+0x15c/0x790 fs/btrfs/defrag.c:136
> >> inode_should_defrag fs/btrfs/inode.c:888 [inline]
> >> compress_file_range+0x2ef/0x1300 fs/btrfs/inode.c:945
> >> btrfs_work_helper+0x390/0xc50 fs/btrfs/async-thread.c:314
> >> process_one_work kernel/workqueue.c:3231 [inline]
> >> process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
> >> worker_thread+0x870/0xd30 kernel/workqueue.c:3393
> >> kthread+0x2f0/0x390 kernel/kthread.c:389
> >> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
> >> ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
> >> page last free pid 7513 tgid 7512 stack trace:
> >> reset_page_owner include/linux/page_owner.h:25 [inline]
> >> free_pages_prepare mm/page_alloc.c:1101 [inline]
> >> free_unref_page+0xd19/0xea0 mm/page_alloc.c:2619
> >> stack_depot_save_flags+0x6f6/0x830 lib/stackdepot.c:666
> >> kasan_save_stack mm/kasan/common.c:48 [inline]
> >> kasan_save_track+0x51/0x80 mm/kasan/common.c:68
> >> poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
> >> __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387
> >> kasan_kmalloc include/linux/kasan.h:211 [inline]
> >> __do_kmalloc_node mm/slub.c:4159 [inline]
> >> __kmalloc_noprof+0x1fc/0x400 mm/slub.c:4171
> >> kmalloc_noprof include/linux/slab.h:694 [inline]
> >> hfsplus_find_init+0x85/0x1c0 fs/hfsplus/bfind.c:21
> >> hfsplus_lookup+0x1ae/0xc70 fs/hfsplus/dir.c:44
> >> lookup_one_qstr_excl+0x11f/0x260 fs/namei.c:1633
> >> filename_create+0x297/0x540 fs/namei.c:4027
> >> do_mkdirat+0xbd/0x3a0 fs/namei.c:4272
> >> __do_sys_mkdirat fs/namei.c:4295 [inline]
> >> __se_sys_mkdirat fs/namei.c:4293 [inline]
> >> __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4293
> >> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> >> do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
> >> entry_SYSCALL_64_after_hwframe+0x77/0x7f
> >>
> >> Memory state around the buggy address:
> >> ffff888056651f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> >> ffff888056651f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> >> >ffff888056652000: fa fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc
> >> ^
> >> ffff888056652080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> >> ffff888056652100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> >> ==================================================================
> >>
> >>
> >> ---
> >> This report is generated by a bot. It may contain errors.
> >> See https://goo.gl/tpsmEJ for more information about syzbot.
> >> syzbot engineers can be reached at syzkaller@googlegroups.com.
> >>
> >> syzbot will keep track of this issue. See:
> >> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> >>
> >> If the report is already addressed, let syzbot know by replying with:
> >> #syz fix: exact-commit-title
> >
> > #syz btrfs: fix use-after-free on rbtree that tracks inodes for auto defrag
>
> unknown command "btrfs:"
#syz fix: btrfs: fix use-after-free on rbtree that tracks inodes for auto defrag
https://lore.kernel.org/linux-btrfs/743f120462032370c7ae8ff899bfd8dbfb0ed006.1726486545.git.fdmanana@suse.com/
>
> >
> > https://lore.kernel.org/linux-btrfs/743f120462032370c7ae8ff899bfd8dbfb0ed006.1726486545.git.fdmanana@suse.com/
> >
> >>
> >> If you want to overwrite report's subsystems, reply with:
> >> #syz set subsystems: new-subsystem
> >> (See the list of subsystem names on the web dashboard)
> >>
> >> If the report is a duplicate of another one, reply with:
> >> #syz dup: exact-subject-of-another-report
> >>
> >> If you want to undo deduplication, reply with:
> >> #syz undup
> >>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [syzbot] [btrfs?] KASAN: slab-use-after-free Read in btrfs_cleanup_defrag_inodes
2024-09-16 14:44 [syzbot] [btrfs?] KASAN: slab-use-after-free Read in btrfs_cleanup_defrag_inodes syzbot
2024-09-16 14:59 ` Filipe Manana
@ 2024-09-16 16:00 ` syzbot
1 sibling, 0 replies; 5+ messages in thread
From: syzbot @ 2024-09-16 16:00 UTC (permalink / raw)
To: clm, dsterba, fdmanana, josef, linux-btrfs, linux-kernel,
syzkaller-bugs
syzbot has found a reproducer for the following issue on:
HEAD commit: adfc3ded5c33 Merge tag 'for-6.12/io_uring-discard-20240913..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=152fa29f980000
kernel config: https://syzkaller.appspot.com/x/.config?x=71033c66cc4b01c4
dashboard link: https://syzkaller.appspot.com/bug?extid=ad7966ca1f5dd8b001b3
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12d79c07980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=160ca8a9980000
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-adfc3ded.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/14d8d89edd95/vmlinux-adfc3ded.xz
kernel image: https://storage.googleapis.com/syzbot-assets/77b35977c15b/bzImage-adfc3ded.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/16dc3a6129eb/mount_0.gz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ad7966ca1f5dd8b001b3@syzkaller.appspotmail.com
BTRFS info (device loop0 state EA): last unmount of filesystem c9fe44da-de57-406a-8241-57ec7d4412cf
==================================================================
BUG: KASAN: slab-use-after-free in rb_left_deepest_node lib/rbtree.c:595 [inline]
BUG: KASAN: slab-use-after-free in rb_first_postorder+0x69/0x90 lib/rbtree.c:628
Read of size 8 at addr ffff888047515010 by task syz-executor245/5095
CPU: 0 UID: 0 PID: 5095 Comm: syz-executor245 Not tainted 6.11.0-syzkaller-02520-gadfc3ded5c33 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:93 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
print_address_description mm/kasan/report.c:377 [inline]
print_report+0x169/0x550 mm/kasan/report.c:488
kasan_report+0x143/0x180 mm/kasan/report.c:601
rb_left_deepest_node lib/rbtree.c:595 [inline]
rb_first_postorder+0x69/0x90 lib/rbtree.c:628
btrfs_cleanup_defrag_inodes+0x2f/0x80 fs/btrfs/defrag.c:212
close_ctree+0x2af/0xd20 fs/btrfs/disk-io.c:4256
generic_shutdown_super+0x139/0x2d0 fs/super.c:642
kill_anon_super+0x3b/0x70 fs/super.c:1237
btrfs_kill_super+0x41/0x50 fs/btrfs/super.c:2121
deactivate_locked_super+0xc4/0x130 fs/super.c:473
cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1373
task_work_run+0x24f/0x310 kernel/task_work.c:228
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0xa2f/0x27f0 kernel/exit.c:882
do_group_exit+0x207/0x2c0 kernel/exit.c:1031
__do_sys_exit_group kernel/exit.c:1042 [inline]
__se_sys_exit_group kernel/exit.c:1040 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1040
x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f37d0596809
Code: Unable to access opcode bytes at 0x7f37d05967df.
RSP: 002b:00007ffd0eed81f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f37d0596809
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001
RBP: 00007f37d0618390 R08: ffffffffffffffb8 R09: 0000000000000000
R10: 0000000000001000 R11: 0000000000000246 R12: 00007f37d0618390
R13: 0000000000000000 R14: 00007f37d0619100 R15: 00007f37d05647a0
</TASK>
Allocated by task 5098:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
unpoison_slab_object mm/kasan/common.c:312 [inline]
__kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook mm/slub.c:3989 [inline]
slab_alloc_node mm/slub.c:4038 [inline]
kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4045
btrfs_add_inode_defrag+0x15c/0x790 fs/btrfs/defrag.c:136
inode_should_defrag fs/btrfs/inode.c:888 [inline]
cow_file_range+0x380/0x11f0 fs/btrfs/inode.c:1382
btrfs_run_delalloc_range+0x33d/0xf70 fs/btrfs/inode.c:2334
writepage_delalloc+0x482/0x7d0 fs/btrfs/extent_io.c:1192
extent_writepage fs/btrfs/extent_io.c:1454 [inline]
extent_write_cache_pages fs/btrfs/extent_io.c:2130 [inline]
btrfs_writepages+0x1157/0x2370 fs/btrfs/extent_io.c:2261
do_writepages+0x35d/0x870 mm/page-writeback.c:2683
filemap_fdatawrite_wbc+0x125/0x180 mm/filemap.c:397
__filemap_fdatawrite_range mm/filemap.c:430 [inline]
filemap_fdatawrite_range+0x120/0x180 mm/filemap.c:448
btrfs_fdatawrite_range+0x53/0xe0 fs/btrfs/file.c:3799
btrfs_direct_write+0x565/0xa70 fs/btrfs/direct-io.c:961
btrfs_do_write_iter+0x2a0/0x760 fs/btrfs/file.c:1505
new_sync_write fs/read_write.c:590 [inline]
vfs_write+0xa6d/0xc90 fs/read_write.c:683
ksys_pwrite64 fs/read_write.c:798 [inline]
__do_sys_pwrite64 fs/read_write.c:808 [inline]
__se_sys_pwrite64 fs/read_write.c:805 [inline]
__x64_sys_pwrite64+0x1aa/0x230 fs/read_write.c:805
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 5098:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579
poison_slab_object+0xe0/0x150 mm/kasan/common.c:240
__kasan_slab_free+0x37/0x60 mm/kasan/common.c:256
kasan_slab_free include/linux/kasan.h:184 [inline]
slab_free_hook mm/slub.c:2250 [inline]
slab_free mm/slub.c:4474 [inline]
kmem_cache_free+0x145/0x350 mm/slub.c:4549
btrfs_cleanup_defrag_inodes+0x51/0x80 fs/btrfs/defrag.c:214
btrfs_remount_cleanup fs/btrfs/super.c:1263 [inline]
btrfs_reconfigure+0x269c/0x2d40 fs/btrfs/super.c:1555
reconfigure_super+0x445/0x880 fs/super.c:1083
vfs_cmd_reconfigure fs/fsopen.c:263 [inline]
vfs_fsconfig_locked fs/fsopen.c:292 [inline]
__do_sys_fsconfig fs/fsopen.c:473 [inline]
__se_sys_fsconfig+0xb68/0xf70 fs/fsopen.c:345
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff888047515000
which belongs to the cache btrfs_inode_defrag of size 56
The buggy address is located 16 bytes inside of
freed 56-byte region [ffff888047515000, ffff888047515038)
The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x47515
flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff)
page_type: 0xfdffffff(slab)
raw: 04fff00000000000 ffff88803d4678c0 dead000000000122 0000000000000000
raw: 0000000000000000 00000000802e002e 00000001fdffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5098, tgid 5098 (syz-executor245), ts 85167218149, free_ts 0
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1500
prep_new_page mm/page_alloc.c:1508 [inline]
get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3446
__alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4702
__alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
alloc_slab_page+0x5f/0x120 mm/slub.c:2319
allocate_slab+0x5a/0x2f0 mm/slub.c:2482
new_slab mm/slub.c:2535 [inline]
___slab_alloc+0xcd1/0x14b0 mm/slub.c:3721
__slab_alloc+0x58/0xa0 mm/slub.c:3811
__slab_alloc_node mm/slub.c:3864 [inline]
slab_alloc_node mm/slub.c:4026 [inline]
kmem_cache_alloc_noprof+0x1c1/0x2a0 mm/slub.c:4045
btrfs_add_inode_defrag+0x15c/0x790 fs/btrfs/defrag.c:136
inode_should_defrag fs/btrfs/inode.c:888 [inline]
cow_file_range+0x380/0x11f0 fs/btrfs/inode.c:1382
btrfs_run_delalloc_range+0x33d/0xf70 fs/btrfs/inode.c:2334
writepage_delalloc+0x482/0x7d0 fs/btrfs/extent_io.c:1192
extent_writepage fs/btrfs/extent_io.c:1454 [inline]
extent_write_cache_pages fs/btrfs/extent_io.c:2130 [inline]
btrfs_writepages+0x1157/0x2370 fs/btrfs/extent_io.c:2261
do_writepages+0x35d/0x870 mm/page-writeback.c:2683
filemap_fdatawrite_wbc+0x125/0x180 mm/filemap.c:397
__filemap_fdatawrite_range mm/filemap.c:430 [inline]
filemap_fdatawrite_range+0x120/0x180 mm/filemap.c:448
page_owner free stack trace missing
Memory state around the buggy address:
ffff888047514f00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888047514f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888047515000: fa fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc
^
ffff888047515080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888047515100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
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2024-09-16 14:44 [syzbot] [btrfs?] KASAN: slab-use-after-free Read in btrfs_cleanup_defrag_inodes syzbot
2024-09-16 14:59 ` Filipe Manana
2024-09-16 14:59 ` syzbot
2024-09-16 15:01 ` Filipe Manana
2024-09-16 16:00 ` syzbot
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