syzbot


kernel BUG in clear_inode

Status: upstream: reported C repro on 2024/05/31 18:56
Subsystems: btrfs
[Documentation on labels]
Reported-by: syzbot+67ba3c42bcbb4665d3ad@syzkaller.appspotmail.com
Fix commit: 88b1afbf0f6b vfs: fix race between evice_inodes() and find_inode()&iput()
Patched on: [ci-qemu-gce-upstream-auto ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 ci-snapshot-upstream-root ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-usb], missing on: [ci-qemu-native-arm64-kvm ci-upstream-gce-arm64]
First crash: 129d, last: 36d
Duplicate bugs (1)
duplicates (1):
Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
kernel BUG in btrfs_run_defrag_inodes (2) btrfs 1 64d 60d 0/28 closed as dup on 2024/08/27 09:42
Discussions (2)
Title Replies (including bot) Last reply
[PATCH] vfs: fix race between evice_inodes() and find_inode()&iput() 6 (6) 2024/08/28 16:36
[syzbot] [btrfs?] kernel BUG in clear_inode 4 (9) 2024/08/23 05:53
Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 kernel BUG in clear_inode origin:upstream C 14 28d 496d 0/3 upstream: reported C repro on 2023/05/25 23:24
linux-5.15 kernel BUG in clear_inode 1 521d 521d 0/3 auto-obsoleted due to no activity on 2023/08/23 09:07
linux-5.15 kernel BUG in clear_inode (2) 2 76d 155d 0/3 upstream: reported on 2024/05/01 04:15
upstream kernel BUG at fs/inode.c:LINE! (2) fs C done unreliable 322 149d 1497d 25/28 fixed on 2024/05/21 07:00
Last patch testing requests (4)
Created Duration User Patch Repo Result
2024/08/23 05:52 0m sunjunchao2870@gmail.com patch git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git d30d0e49da71 error
2024/08/23 05:30 0m sunjunchao2870@gmail.com patch git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git d30d0e49da71 error
2024/08/21 09:43 24m sunjunchao2870@gmail.com patch git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git d30d0e49da71 OK log
2024/06/24 16:20 24m retest repro upstream report log

Sample crash report:
------------[ cut here ]------------
kernel BUG at fs/inode.c:626!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 1 PID: 5273 Comm: syz-executor331 Not tainted 6.10.0-rc2-syzkaller-00222-gd30d0e49da71 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:clear_inode+0x15b/0x190 fs/inode.c:626
Code: 00 00 00 5b 5d 41 5c c3 cc cc cc cc e8 5e c1 8c ff 90 0f 0b e8 56 c1 8c ff 90 0f 0b e8 4e c1 8c ff 90 0f 0b e8 46 c1 8c ff 90 <0f> 0b e8 3e c1 8c ff 90 0f 0b e8 e6 92 e8 ff e9 d2 fe ff ff e8 dc
RSP: 0018:ffffc900036f7ac0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888030369e90 RCX: ffffffff82012340
RDX: ffff888024190000 RSI: ffffffff820123aa RDI: 0000000000000007
RBP: 0000000000000040 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000040 R11: 0000000000000001 R12: 0000000000000020
R13: ffff88802f942000 R14: 0000000000000000 R15: ffff888030369e90
FS:  000055556268d380(0000) GS:ffff88806b100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555562697708 CR3: 000000001e888000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 btrfs_evict_inode+0x529/0xe80 fs/btrfs/inode.c:5262
 evict+0x2ed/0x6c0 fs/inode.c:667
 dispose_list+0x117/0x1e0 fs/inode.c:700
 evict_inodes+0x34e/0x450 fs/inode.c:750
 generic_shutdown_super+0xb5/0x3d0 fs/super.c:627
 kill_anon_super+0x3a/0x60 fs/super.c:1226
 btrfs_kill_super+0x3b/0x50 fs/btrfs/super.c:2096
 deactivate_locked_super+0xbe/0x1a0 fs/super.c:473
 deactivate_super+0xde/0x100 fs/super.c:506
 cleanup_mnt+0x222/0x450 fs/namespace.c:1267
 task_work_run+0x14e/0x250 kernel/task_work.c:180
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [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+0x278/0x2a0 kernel/entry/common.c:218
 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2ba3059777
Code: 07 00 48 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007fff42f9ee78 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f2ba3059777
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff42f9ef30
RBP: 00007fff42f9ef30 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000206 R12: 00007fff42f9ffa0
R13: 000055556268f6d0 R14: 431bde82d7b634db R15: 00007fff42f9ffc0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:clear_inode+0x15b/0x190 fs/inode.c:626
Code: 00 00 00 5b 5d 41 5c c3 cc cc cc cc e8 5e c1 8c ff 90 0f 0b e8 56 c1 8c ff 90 0f 0b e8 4e c1 8c ff 90 0f 0b e8 46 c1 8c ff 90 <0f> 0b e8 3e c1 8c ff 90 0f 0b e8 e6 92 e8 ff e9 d2 fe ff ff e8 dc
RSP: 0018:ffffc900036f7ac0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888030369e90 RCX: ffffffff82012340
RDX: ffff888024190000 RSI: ffffffff820123aa RDI: 0000000000000007
RBP: 0000000000000040 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000040 R11: 0000000000000001 R12: 0000000000000020
R13: ffff88802f942000 R14: 0000000000000000 R15: ffff888030369e90
FS:  000055556268d380(0000) GS:ffff88806b100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555562697708 CR3: 000000001e888000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (9):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/06/07 05:05 upstream d30d0e49da71 c2e07261 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro] ci-qemu-upstream kernel BUG in clear_inode
2024/07/24 14:58 upstream 786c8248dbd3 57b2edb1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in clear_inode
2024/07/15 02:38 upstream 0c3836482481 eaeb5c15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in clear_inode
2024/06/10 16:15 upstream 83a7eefedc9b 048c640a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in clear_inode
2024/05/27 18:51 upstream 2bfcfd584ff5 c2e07261 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 kernel BUG in clear_inode
2024/08/28 15:07 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci df54f4a16f82 940f38c1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in clear_inode
2024/08/12 05:58 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci c912bf709078 6f4edef4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in clear_inode
2024/07/26 15:29 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci c912bf709078 3f86dfed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in clear_inode
2024/07/22 22:19 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci c912bf709078 f063dfd9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in clear_inode
* Struck through repros no longer work on HEAD.