* [syzbot] [ext4?] WARNING: locking bug in get_page_from_freelist
@ 2024-11-04 17:56 syzbot
2024-11-25 2:49 ` syzbot
0 siblings, 1 reply; 4+ messages in thread
From: syzbot @ 2024-11-04 17:56 UTC (permalink / raw)
To: adilger.kernel, linux-ext4, linux-kernel, syzkaller-bugs, tytso
Hello,
syzbot found the following issue on:
HEAD commit: f9f24ca362a4 Add linux-next specific files for 20241031
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1306e55f980000
kernel config: https://syzkaller.appspot.com/x/.config?x=328572ed4d152be9
dashboard link: https://syzkaller.appspot.com/bug?extid=5abecb17ba9299033d79
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/eb84549dd6b3/disk-f9f24ca3.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/beb29bdfa297/vmlinux-f9f24ca3.xz
kernel image: https://storage.googleapis.com/syzbot-assets/8881fe3245ad/bzImage-f9f24ca3.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5abecb17ba9299033d79@syzkaller.appspotmail.com
=============================
[ BUG: Invalid wait context ]
6.12.0-rc5-next-20241031-syzkaller #0 Not tainted
-----------------------------
syz.5.314/7533 is trying to lock:
ffff88813fffc298 (&zone->lock){-.-.}-{3:3}, at: rmqueue_buddy mm/page_alloc.c:2928 [inline]
ffff88813fffc298 (&zone->lock){-.-.}-{3:3}, at: rmqueue mm/page_alloc.c:3101 [inline]
ffff88813fffc298 (&zone->lock){-.-.}-{3:3}, at: get_page_from_freelist+0xb60/0x3870 mm/page_alloc.c:3492
other info that might help us debug this:
context-{2:2}
3 locks held by syz.5.314/7533:
#0: ffff88806324a420 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:515
#1: ffff88806366e708 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:852 [inline]
#1: ffff88806366e708 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: do_unlinkat+0x26a/0x830 fs/namei.c:4520
#2: ffff8880b8644618 (&pcp->lock){+.+.}-{3:3}, at: spin_trylock include/linux/spinlock.h:361 [inline]
#2: ffff8880b8644618 (&pcp->lock){+.+.}-{3:3}, at: rmqueue_pcplist mm/page_alloc.c:3051 [inline]
#2: ffff8880b8644618 (&pcp->lock){+.+.}-{3:3}, at: rmqueue mm/page_alloc.c:3095 [inline]
#2: ffff8880b8644618 (&pcp->lock){+.+.}-{3:3}, at: get_page_from_freelist+0x7e2/0x3870 mm/page_alloc.c:3492
stack backtrace:
CPU: 0 UID: 0 PID: 7533 Comm: syz.5.314 Not tainted 6.12.0-rc5-next-20241031-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
print_lock_invalid_wait_context kernel/locking/lockdep.c:4826 [inline]
check_wait_context kernel/locking/lockdep.c:4898 [inline]
__lock_acquire+0x15a8/0x2100 kernel/locking/lockdep.c:5176
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
rmqueue_buddy mm/page_alloc.c:2928 [inline]
rmqueue mm/page_alloc.c:3101 [inline]
get_page_from_freelist+0xb60/0x3870 mm/page_alloc.c:3492
__alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4771
alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265
stack_depot_save_flags+0x666/0x830 lib/stackdepot.c:627
kasan_save_stack+0x4f/0x60 mm/kasan/common.c:48
__kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:544
task_work_add+0xd9/0x490 kernel/task_work.c:77
__run_posix_cpu_timers kernel/time/posix-cpu-timers.c:1219 [inline]
run_posix_cpu_timers+0x6ac/0x810 kernel/time/posix-cpu-timers.c:1418
tick_sched_handle kernel/time/tick-sched.c:276 [inline]
tick_nohz_handler+0x37c/0x500 kernel/time/tick-sched.c:297
__run_hrtimer kernel/time/hrtimer.c:1691 [inline]
__hrtimer_run_queues+0x551/0xd50 kernel/time/hrtimer.c:1755
hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1817
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
__sysvec_apic_timer_interrupt+0x110/0x420 arch/x86/kernel/apic/apic.c:1055
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xd8/0x140 kernel/locking/spinlock.c:194
Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 1e ca 31 f6 f6 44 24 21 02 75 52 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 53 9e 95 f5 65 8b 05 74 43 36 74 85 c0 74 43 48 c7 04 24 0e 36
RSP: 0018:ffffc9000322e6c0 EFLAGS: 00000206
RAX: 17152d909170b000 RBX: 1ffff92000645cdc RCX: ffffffff8170c69a
RDX: dffffc0000000000 RSI: ffffffff8c0ad3a0 RDI: 0000000000000001
RBP: ffffc9000322e748 R08: ffffffff942cd847 R09: 1ffffffff2859b08
R10: dffffc0000000000 R11: fffffbfff2859b09 R12: dffffc0000000000
R13: 1ffff92000645cd8 R14: ffffc9000322e6e0 R15: 0000000000000246
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
rmqueue_bulk mm/page_alloc.c:2347 [inline]
__rmqueue_pcplist+0x22e8/0x2b70 mm/page_alloc.c:3022
rmqueue_pcplist mm/page_alloc.c:3064 [inline]
rmqueue mm/page_alloc.c:3095 [inline]
get_page_from_freelist+0x895/0x3870 mm/page_alloc.c:3492
__alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4771
alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265
stack_depot_save_flags+0x666/0x830 lib/stackdepot.c:627
kasan_save_stack mm/kasan/common.c:48 [inline]
kasan_save_track+0x51/0x80 mm/kasan/common.c:68
unpoison_slab_object mm/kasan/common.c:319 [inline]
__kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4104 [inline]
slab_alloc_node mm/slub.c:4153 [inline]
kmem_cache_alloc_noprof+0x1d9/0x380 mm/slub.c:4160
mempool_alloc_noprof+0x197/0x5a0 mm/mempool.c:402
bio_alloc_bioset+0x26f/0x1130 block/bio.c:554
bio_alloc include/linux/bio.h:374 [inline]
submit_bh_wbc+0x275/0x580 fs/buffer.c:2794
ext4_read_bh_lock+0x8d/0xc0 fs/ext4/super.c:211
ext4_bread_batch+0x24c/0x4e0 fs/ext4/inode.c:937
__ext4_find_entry+0x1051/0x1b30 fs/ext4/namei.c:1627
ext4_lookup_entry fs/ext4/namei.c:1729 [inline]
ext4_lookup+0x15f/0x750 fs/ext4/namei.c:1797
lookup_one_qstr_excl+0x11f/0x260 fs/namei.c:1633
do_unlinkat+0x297/0x830 fs/namei.c:4521
do_coredump+0x20e3/0x3100 fs/coredump.c:669
get_signal+0x13fc/0x1740 kernel/signal.c:2869
arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6ce317e719
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6ce15f6038 EFLAGS: 00000246 ORIG_RAX: 00000000000000df
RAX: 0000000000000000 RBX: 00007f6ce3335f80 RCX: 00007f6ce317e719
RDX: 00000000200000c0 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 00007f6ce31f132e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f6ce3335f80 R15: 00007ffdd07ea2b8
</TASK>
----------------
Code disassembly (best guess):
0: 9c pushf
1: 8f 44 24 20 pop 0x20(%rsp)
5: 42 80 3c 23 00 cmpb $0x0,(%rbx,%r12,1)
a: 74 08 je 0x14
c: 4c 89 f7 mov %r14,%rdi
f: e8 1e ca 31 f6 call 0xf631ca32
14: f6 44 24 21 02 testb $0x2,0x21(%rsp)
19: 75 52 jne 0x6d
1b: 41 f7 c7 00 02 00 00 test $0x200,%r15d
22: 74 01 je 0x25
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 53 9e 95 f5 call 0xf5959e82 <-- trapping instruction
2f: 65 8b 05 74 43 36 74 mov %gs:0x74364374(%rip),%eax # 0x743643aa
36: 85 c0 test %eax,%eax
38: 74 43 je 0x7d
3a: 48 rex.W
3b: c7 .byte 0xc7
3c: 04 24 add $0x24,%al
3e: 0e (bad)
3f: 36 ss
---
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
If you want to overwrite report's subsystems, reply with:
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(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] 4+ messages in thread
* Re: [syzbot] [ext4?] WARNING: locking bug in get_page_from_freelist
2024-11-04 17:56 [syzbot] [ext4?] WARNING: locking bug in get_page_from_freelist syzbot
@ 2024-11-25 2:49 ` syzbot
2024-11-25 10:52 ` Hillf Danton
0 siblings, 1 reply; 4+ messages in thread
From: syzbot @ 2024-11-25 2:49 UTC (permalink / raw)
To: adilger.kernel, akpm, linux-ext4, linux-kernel, linux-mm,
syzkaller-bugs, tytso
syzbot has found a reproducer for the following issue on:
HEAD commit: 9f16d5e6f220 Merge tag 'for-linus' of git://git.kernel.org..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1202a530580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7393f07275e8e571
dashboard link: https://syzkaller.appspot.com/bug?extid=5abecb17ba9299033d79
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=177ab75f980000
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-9f16d5e6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/8a4ab7536099/vmlinux-9f16d5e6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a94d1bc43eff/bzImage-9f16d5e6.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5abecb17ba9299033d79@syzkaller.appspotmail.com
=============================
[ BUG: Invalid wait context ]
6.12.0-syzkaller-09073-g9f16d5e6f220 #0 Not tainted
-----------------------------
sshd/5943 is trying to lock:
ffff88807ffd8298 (&zone->lock){..-.}-{3:3}, at: rmqueue_buddy mm/page_alloc.c:2907 [inline]
ffff88807ffd8298 (&zone->lock){..-.}-{3:3}, at: rmqueue mm/page_alloc.c:3080 [inline]
ffff88807ffd8298 (&zone->lock){..-.}-{3:3}, at: get_page_from_freelist+0xbbe/0x2f80 mm/page_alloc.c:3471
other info that might help us debug this:
context-{2:2}
3 locks held by sshd/5943:
#0: ffff888022f8b148 (&vma->vm_lock->lock){++++}-{4:4}, at: vma_start_read include/linux/mm.h:716 [inline]
#0: ffff888022f8b148 (&vma->vm_lock->lock){++++}-{4:4}, at: lock_vma_under_rcu+0x13e/0x980 mm/memory.c:6278
#1: ffff88806a944c58 (&pcp->lock){+.+.}-{3:3}, at: spin_trylock include/linux/spinlock.h:361 [inline]
#1: ffff88806a944c58 (&pcp->lock){+.+.}-{3:3}, at: rmqueue_pcplist mm/page_alloc.c:3030 [inline]
#1: ffff88806a944c58 (&pcp->lock){+.+.}-{3:3}, at: rmqueue mm/page_alloc.c:3074 [inline]
#1: ffff88806a944c58 (&pcp->lock){+.+.}-{3:3}, at: get_page_from_freelist+0x350/0x2f80 mm/page_alloc.c:3471
#2: ffff88806a93ebd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:598
stack backtrace:
CPU: 3 UID: 0 PID: 5943 Comm: sshd Not tainted 6.12.0-syzkaller-09073-g9f16d5e6f220 #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:
<IRQ>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_lock_invalid_wait_context kernel/locking/lockdep.c:4826 [inline]
check_wait_context kernel/locking/lockdep.c:4898 [inline]
__lock_acquire+0x878/0x3c40 kernel/locking/lockdep.c:5176
lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
rmqueue_buddy mm/page_alloc.c:2907 [inline]
rmqueue mm/page_alloc.c:3080 [inline]
get_page_from_freelist+0xbbe/0x2f80 mm/page_alloc.c:3471
__alloc_pages_noprof+0x223/0x25a0 mm/page_alloc.c:4751
alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2265
stack_depot_save_flags+0x566/0x8f0 lib/stackdepot.c:627
kasan_save_stack+0x42/0x60 mm/kasan/common.c:48
__kasan_record_aux_stack+0xba/0xd0 mm/kasan/generic.c:541
task_work_add+0xc0/0x3b0 kernel/task_work.c:77
task_tick_numa kernel/sched/fair.c:3607 [inline]
task_tick_fair+0x524/0x8e0 kernel/sched/fair.c:13054
sched_tick+0x1dd/0x4f0 kernel/sched/core.c:5652
update_process_times+0x19c/0x2d0 kernel/time/timer.c:2524
tick_sched_handle kernel/time/tick-sched.c:276 [inline]
tick_nohz_handler+0x376/0x530 kernel/time/tick-sched.c:297
__run_hrtimer kernel/time/hrtimer.c:1739 [inline]
__hrtimer_run_queues+0x5fb/0xae0 kernel/time/hrtimer.c:1803
hrtimer_interrupt+0x392/0x8e0 kernel/time/hrtimer.c:1865
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
__sysvec_apic_timer_interrupt+0x10f/0x400 arch/x86/kernel/apic/apic.c:1055
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1049
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:86 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:104 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:129 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:161 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0xfb/0x1a0 mm/kasan/generic.c:189
Code: d2 74 1e 41 83 e2 07 49 39 d1 75 0a 45 3a 11 b8 01 00 00 00 7c 0b 44 89 c2 e8 e1 ea ff ff 83 f0 01 5b 5d 41 5c c3 cc cc cc cc <48> 85 d2 74 4f 48 01 ea eb 09 48 83 c0 01 48 39 d0 74 41 80 38 00
RSP: 0000:ffffc90003e97610 EFLAGS: 00000283
RAX: fffffbfff20beb82 RBX: fffffbfff20beb83 RCX: ffffffff816b64e9
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffffff905f5c10
RBP: fffffbfff20beb82 R08: 0000000000000000 R09: fffffbfff20beb82
R10: ffffffff905f5c17 R11: 0000000000000001 R12: ffff88806a944c58
R13: 0000000000000070 R14: dffffc0000000000 R15: ffff88807ffd7c80
instrument_atomic_read include/linux/instrumented.h:68 [inline]
_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
cpumask_test_cpu include/linux/cpumask.h:570 [inline]
cpu_online include/linux/cpumask.h:1117 [inline]
trace_lock_release include/trace/events/lock.h:69 [inline]
lock_release+0xa9/0x6f0 kernel/locking/lockdep.c:5860
__raw_spin_unlock include/linux/spinlock_api_smp.h:141 [inline]
_raw_spin_unlock+0x16/0x50 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
rmqueue_pcplist mm/page_alloc.c:3044 [inline]
rmqueue mm/page_alloc.c:3074 [inline]
get_page_from_freelist+0x3df/0x2f80 mm/page_alloc.c:3471
__alloc_pages_noprof+0x223/0x25a0 mm/page_alloc.c:4751
alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2265
folio_alloc_mpol_noprof+0x36/0xd0 mm/mempolicy.c:2283
vma_alloc_folio_noprof+0xee/0x1b0 mm/mempolicy.c:2313
folio_prealloc mm/memory.c:1060 [inline]
alloc_anon_folio mm/memory.c:4752 [inline]
do_anonymous_page mm/memory.c:4809 [inline]
do_pte_missing+0x2021/0x3e70 mm/memory.c:3977
handle_pte_fault mm/memory.c:5801 [inline]
__handle_mm_fault+0x103c/0x2a40 mm/memory.c:5944
handle_mm_fault+0x3fa/0xaa0 mm/memory.c:6112
do_user_addr_fault+0x60d/0x13f0 arch/x86/mm/fault.c:1338
handle_page_fault arch/x86/mm/fault.c:1481 [inline]
exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x558b31029823
Code: 4c 89 ed 4c 89 e7 f3 aa eb 48 4c 89 e7 e8 95 48 f7 ff 48 89 c5 48 85 c0 74 38 48 89 c7 4c 89 ee 4d 39 f4 76 11 4c 89 f1 31 c0 <f3> a4 4c 89 e1 4c 29 f1 f3 aa eb 05 4c 89 e1 f3 a4 4c 89 ef 48 83
RSP: 002b:00007ffc18dbe180 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000350000 RCX: 000000000011e010
RDX: 0000000000000002 RSI: 00007fa8c26db000 RDI: 00007fa8c238a000
RBP: 00007fa8c2160010 R08: 00007fa8c2160010 R09: 0000000000000000
R10: 0000000000000022 R11: 0000000000000246 R12: 0000000000350000
R13: 00007fa8c24b1010 R14: 0000000000348000 R15: 00007ffc18dbe338
</TASK>
----------------
Code disassembly (best guess):
0: d2 74 1e 41 shlb %cl,0x41(%rsi,%rbx,1)
4: 83 e2 07 and $0x7,%edx
7: 49 39 d1 cmp %rdx,%r9
a: 75 0a jne 0x16
c: 45 3a 11 cmp (%r9),%r10b
f: b8 01 00 00 00 mov $0x1,%eax
14: 7c 0b jl 0x21
16: 44 89 c2 mov %r8d,%edx
19: e8 e1 ea ff ff call 0xffffeaff
1e: 83 f0 01 xor $0x1,%eax
21: 5b pop %rbx
22: 5d pop %rbp
23: 41 5c pop %r12
25: c3 ret
26: cc int3
27: cc int3
28: cc int3
29: cc int3
* 2a: 48 85 d2 test %rdx,%rdx <-- trapping instruction
2d: 74 4f je 0x7e
2f: 48 01 ea add %rbp,%rdx
32: eb 09 jmp 0x3d
34: 48 83 c0 01 add $0x1,%rax
38: 48 39 d0 cmp %rdx,%rax
3b: 74 41 je 0x7e
3d: 80 38 00 cmpb $0x0,(%rax)
---
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.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [syzbot] [ext4?] WARNING: locking bug in get_page_from_freelist
2024-11-25 2:49 ` syzbot
@ 2024-11-25 10:52 ` Hillf Danton
2024-11-25 11:10 ` syzbot
0 siblings, 1 reply; 4+ messages in thread
From: Hillf Danton @ 2024-11-25 10:52 UTC (permalink / raw)
To: syzbot
Cc: adilger.kernel, linux-ext4, linux-kernel, syzkaller-bugs,
Sebastian Andrzej Siewior, tytso
On Sun, 24 Nov 2024 18:49:19 -0800
> syzbot has found a reproducer for the following issue on:
>
> HEAD commit: 9f16d5e6f220 Merge tag 'for-linus' of git://git.kernel.org..
> git tree: upstream
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=177ab75f980000
Test the idea [1]
[1] https://lore.kernel.org/lkml/20241122155451.Mb2pmeyJ@linutronix.de/
#syz test
--- x/mm/kasan/generic.c
+++ y/mm/kasan/generic.c
@@ -538,7 +538,7 @@ static void __kasan_record_aux_stack(voi
return;
alloc_meta->aux_stack[1] = alloc_meta->aux_stack[0];
- alloc_meta->aux_stack[0] = kasan_save_stack(0, depot_flags);
+ alloc_meta->aux_stack[0] = kasan_save_stack(0, 0);
}
void kasan_record_aux_stack(void *addr)
--
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [syzbot] [ext4?] WARNING: locking bug in get_page_from_freelist
2024-11-25 10:52 ` Hillf Danton
@ 2024-11-25 11:10 ` syzbot
0 siblings, 0 replies; 4+ messages in thread
From: syzbot @ 2024-11-25 11:10 UTC (permalink / raw)
To: adilger.kernel, bigeasy, hdanton, linux-ext4, linux-kernel,
syzkaller-bugs, tytso
Hello,
syzbot has tested the proposed patch and the reproducer did not trigger any issue:
Reported-by: syzbot+5abecb17ba9299033d79@syzkaller.appspotmail.com
Tested-by: syzbot+5abecb17ba9299033d79@syzkaller.appspotmail.com
Tested on:
commit: 9f16d5e6 Merge tag 'for-linus' of git://git.kernel.org..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13a4dee8580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7393f07275e8e571
dashboard link: https://syzkaller.appspot.com/bug?extid=5abecb17ba9299033d79
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
patch: https://syzkaller.appspot.com/x/patch.diff?x=15b46530580000
Note: testing is done by a robot and is best-effort only.
^ permalink raw reply [flat|nested] 4+ messages in thread
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2024-11-04 17:56 [syzbot] [ext4?] WARNING: locking bug in get_page_from_freelist syzbot
2024-11-25 2:49 ` syzbot
2024-11-25 10:52 ` Hillf Danton
2024-11-25 11:10 ` syzbot
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