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Mon, 22 Sep 2025 22:15:47 -0700 (PDT) Date: Mon, 22 Sep 2025 22:15:47 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68d22d03.a70a0220.1b52b.004f.GAE@google.com> Subject: [moderation/CI] Re: ext4: optimize online defragment From: syzbot ci To: syzkaller-upstream-moderation@googlegroups.com Cc: syzbot@lists.linux.dev Content-Type: text/plain; charset="UTF-8" syzbot ci has tested the following series [v1] ext4: optimize online defragment https://lore.kernel.org/all/20250923012724.2378858-1-yi.zhang@huaweicloud.com * [PATCH 01/13] ext4: fix an off-by-one issue during moving extents * [PATCH 02/13] ext4: correct the checking of quota files before moving extents * [PATCH 03/13] ext4: introduce seq counter for the extent status entry * [PATCH 04/13] ext4: make ext4_es_lookup_extent() pass out the extent seq counter * [PATCH 05/13] ext4: pass out extent seq counter when mapping blocks * [PATCH 06/13] ext4: use EXT4_B_TO_LBLK() in mext_check_arguments() * [PATCH 07/13] ext4: add mext_check_validity() to do basic check * [PATCH 08/13] ext4: refactor mext_check_arguments() * [PATCH 09/13] ext4: rename mext_page_mkuptodate() to mext_folio_mkuptodate() * [PATCH 10/13] ext4: introduce mext_move_extent() * [PATCH 11/13] ext4: switch to using the new extent movement method * [PATCH 12/13] ext4: add large folios support for moving extents * [PATCH 13/13] ext4: add two trace points for moving extents and found the following issues: * KASAN: slab-out-of-bounds Read in ext4_inode_journal_mode * general protection fault in ext4_inode_journal_mode Full report is available here: https://ci.syzbot.org/series/89adca9b-1e59-47cd-8ba6-0a57d76309c9 *** KASAN: slab-out-of-bounds Read in ext4_inode_journal_mode tree: torvalds URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux base: 07e27ad16399afcd693be20211b0dfae63e0615f arch: amd64 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 config: https://ci.syzbot.org/builds/17d2b187-99c8-4493-9c72-e8fcf7741d20/config C repro: https://ci.syzbot.org/findings/b98c412d-c481-4663-b80b-a50550db3406/c_repro syz repro: https://ci.syzbot.org/findings/b98c412d-c481-4663-b80b-a50550db3406/syz_repro EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. ext4 filesystem being mounted at /0/bus supports timestamps until 2038-01-19 (0x7fffffff) ================================================================== BUG: KASAN: slab-out-of-bounds in ext4_inode_journal_mode+0x7b/0x480 fs/ext4/ext4_jbd2.c:12 Read of size 8 at addr ffff88801cefc378 by task syz.0.17/5984 CPU: 0 UID: 0 PID: 5984 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 ext4_inode_journal_mode+0x7b/0x480 fs/ext4/ext4_jbd2.c:12 ext4_should_journal_data fs/ext4/ext4_jbd2.h:381 [inline] mext_check_validity fs/ext4/move_extent.c:426 [inline] ext4_move_extents+0x2bb/0x3630 fs/ext4/move_extent.c:579 __ext4_ioctl fs/ext4/ioctl.c:1356 [inline] ext4_ioctl+0x26a7/0x33c0 fs/ext4/ioctl.c:1616 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:598 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:584 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6a6678ec29 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:00007ffea3688b38 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f6a669d5fa0 RCX: 00007f6a6678ec29 RDX: 0000200000000040 RSI: 00000000c028660f RDI: 0000000000000004 RBP: 00007f6a66811e41 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6a669d5fa0 R14: 00007f6a669d5fa0 R15: 0000000000000003 Allocated by task 1: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:388 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:405 kasan_kmalloc include/linux/kasan.h:260 [inline] __kmalloc_cache_noprof+0x230/0x3d0 mm/slub.c:4407 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] shmem_fill_super+0xc8/0x1190 mm/shmem.c:5059 vfs_get_super fs/super.c:1325 [inline] get_tree_nodev+0xbb/0x150 fs/super.c:1344 vfs_get_tree+0x92/0x2b0 fs/super.c:1815 fc_mount fs/namespace.c:1247 [inline] vfs_kern_mount+0xbe/0x160 fs/namespace.c:1286 devtmpfs_init+0x98/0x330 drivers/base/devtmpfs.c:484 driver_init+0x15/0x60 drivers/base/init.c:25 do_basic_setup+0xf/0x70 init/main.c:1363 kernel_init_freeable+0x334/0x4b0 init/main.c:1579 kernel_init+0x1d/0x1d0 init/main.c:1469 ret_from_fork+0x439/0x7d0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 The buggy address belongs to the object at ffff88801cefc000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 544 bytes to the right of allocated 344-byte region [ffff88801cefc000, ffff88801cefc158) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1cefc head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801a441c80 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801a441c80 dead000000000122 0000000000000000 head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000002 ffffea000073bf01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 1877776345, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851 prep_new_page mm/page_alloc.c:1859 [inline] get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416 alloc_slab_page mm/slub.c:2492 [inline] allocate_slab+0x8a/0x370 mm/slub.c:2660 new_slab mm/slub.c:2714 [inline] ___slab_alloc+0xbeb/0x1420 mm/slub.c:3901 __slab_alloc mm/slub.c:3992 [inline] __slab_alloc_node mm/slub.c:4067 [inline] slab_alloc_node mm/slub.c:4228 [inline] __kmalloc_cache_noprof+0x296/0x3d0 mm/slub.c:4402 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] shmem_fill_super+0xc8/0x1190 mm/shmem.c:5059 vfs_get_super fs/super.c:1325 [inline] get_tree_nodev+0xbb/0x150 fs/super.c:1344 vfs_get_tree+0x92/0x2b0 fs/super.c:1815 fc_mount fs/namespace.c:1247 [inline] vfs_kern_mount+0xbe/0x160 fs/namespace.c:1286 devtmpfs_init+0x98/0x330 drivers/base/devtmpfs.c:484 driver_init+0x15/0x60 drivers/base/init.c:25 do_basic_setup+0xf/0x70 init/main.c:1363 kernel_init_freeable+0x334/0x4b0 init/main.c:1579 kernel_init+0x1d/0x1d0 init/main.c:1469 page_owner free stack trace missing Memory state around the buggy address: ffff88801cefc200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801cefc280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88801cefc300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88801cefc380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801cefc400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== *** general protection fault in ext4_inode_journal_mode tree: torvalds URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux base: 07e27ad16399afcd693be20211b0dfae63e0615f arch: amd64 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 config: https://ci.syzbot.org/builds/17d2b187-99c8-4493-9c72-e8fcf7741d20/config syz repro: https://ci.syzbot.org/findings/9f9fdff9-ee39-4921-9a7a-35ab05cc081b/syz_repro EXT4-fs (loop1): mounted filesystem 76b65be2-f6da-4727-8c75-0525a5b65a09 r/w without journal. Quota mode: none. ext4 filesystem being mounted at /0/mnt supports timestamps until 2038-01-19 (0x7fffffff) Oops: general protection fault, probably for non-canonical address 0xdffffc000000006f: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000378-0x000000000000037f] CPU: 0 UID: 0 PID: 6013 Comm: syz.1.18 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:ext4_inode_journal_mode+0x6d/0x480 fs/ext4/ext4_jbd2.c:12 Code: 00 4d 03 7d 00 4c 89 f8 48 c1 e8 03 80 3c 28 00 74 08 4c 89 ff e8 03 9e b6 ff 41 bc 78 03 00 00 4d 03 27 4c 89 e0 48 c1 e8 03 <80> 3c 28 00 74 08 4c 89 e7 e8 e5 9d b6 ff 49 83 3c 24 00 0f 84 01 RSP: 0018:ffffc90002d6f638 EFLAGS: 00010206 RAX: 000000000000006f RBX: ffff88811249ad48 RCX: ffff888021ed9cc0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88811249ad48 RBP: dffffc0000000000 R08: ffff88811249ae2f R09: 1ffff110224935c5 R10: dffffc0000000000 R11: ffffed10224935c6 R12: 0000000000000378 R13: ffff88811249ad70 R14: 1ffff110224935ae R15: ffff88801bfa6640 FS: 00007fa922e456c0(0000) GS:ffff8880b8612000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000040 CR3: 000000010f5f6000 CR4: 00000000000006f0 Call Trace: ext4_should_journal_data fs/ext4/ext4_jbd2.h:381 [inline] mext_check_validity fs/ext4/move_extent.c:426 [inline] ext4_move_extents+0x2bb/0x3630 fs/ext4/move_extent.c:579 __ext4_ioctl fs/ext4/ioctl.c:1356 [inline] ext4_ioctl+0x26a7/0x33c0 fs/ext4/ioctl.c:1616 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:598 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:584 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa921f8ec29 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:00007fa922e45038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fa9221d5fa0 RCX: 00007fa921f8ec29 RDX: 0000200000000040 RSI: 00000000c028660f RDI: 0000000000000004 RBP: 00007fa922011e41 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa9221d6038 R14: 00007fa9221d5fa0 R15: 00007ffcaaedca68 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ext4_inode_journal_mode+0x6d/0x480 fs/ext4/ext4_jbd2.c:12 Code: 00 4d 03 7d 00 4c 89 f8 48 c1 e8 03 80 3c 28 00 74 08 4c 89 ff e8 03 9e b6 ff 41 bc 78 03 00 00 4d 03 27 4c 89 e0 48 c1 e8 03 <80> 3c 28 00 74 08 4c 89 e7 e8 e5 9d b6 ff 49 83 3c 24 00 0f 84 01 RSP: 0018:ffffc90002d6f638 EFLAGS: 00010206 RAX: 000000000000006f RBX: ffff88811249ad48 RCX: ffff888021ed9cc0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88811249ad48 RBP: dffffc0000000000 R08: ffff88811249ae2f R09: 1ffff110224935c5 R10: dffffc0000000000 R11: ffffed10224935c6 R12: 0000000000000378 R13: ffff88811249ad70 R14: 1ffff110224935ae R15: ffff88801bfa6640 FS: 00007fa922e456c0(0000) GS:ffff8881a3c12000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000000012c0 CR3: 000000010f5f6000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess): 0: 00 4d 03 add %cl,0x3(%rbp) 3: 7d 00 jge 0x5 5: 4c 89 f8 mov %r15,%rax 8: 48 c1 e8 03 shr $0x3,%rax c: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) 10: 74 08 je 0x1a 12: 4c 89 ff mov %r15,%rdi 15: e8 03 9e b6 ff call 0xffb69e1d 1a: 41 bc 78 03 00 00 mov $0x378,%r12d 20: 4d 03 27 add (%r15),%r12 23: 4c 89 e0 mov %r12,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 e7 mov %r12,%rdi 33: e8 e5 9d b6 ff call 0xffb69e1d 38: 49 83 3c 24 00 cmpq $0x0,(%r12) 3d: 0f .byte 0xf 3e: 84 01 test %al,(%rcx) *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com. The email will later be sent to: [adilger.kernel@dilger.ca jack@suse.cz libaokun1@huawei.com linux-ext4@vger.kernel.org linux-fsdevel@vger.kernel.org linux-kernel@vger.kernel.org tytso@mit.edu yangerkun@huawei.com yi.zhang@huawei.com yi.zhang@huaweicloud.com yukuai3@huawei.com] If the report looks fine to you, reply with: #syz upstream