* [syzbot] [btrfs?] kernel BUG in compress_file_range
@ 2026-08-01 0:25 syzbot
2026-08-01 5:31 ` Qu Wenruo
0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2026-08-01 0:25 UTC (permalink / raw)
To: clm, dsterba, linux-btrfs, linux-kernel, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: f5098b6bae76 Linux 7.2-rc5
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17829632580000
kernel config: https://syzkaller.appspot.com/x/.config?x=b7079b368dcec295
dashboard link: https://syzkaller.appspot.com/bug?extid=db04810ad3d91a0a4697
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b18067cdf26c/disk-f5098b6b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2b364c33a0f2/vmlinux-f5098b6b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/2dfce6f90a4d/bzImage-f5098b6b.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+db04810ad3d91a0a4697@syzkaller.appspotmail.com
------------[ cut here ]------------
kernel BUG at fs/btrfs/inode.c:977!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 1 UID: 0 PID: 752 Comm: kworker/u8:6 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Workqueue: btrfs-delalloc btrfs_work_helper
RIP: 0010:compress_file_range+0x1e27/0x2430 fs/btrfs/inode.c:977
Code: af 0c 01 e8 db 39 8a fd e9 55 fd ff ff e8 51 fc ae fd 48 c7 c6 20 1d 28 8c 48 89 df e8 a2 ab ff fd 90 0f 0b e8 3a fc ae fd 90 <0f> 0b e8 32 fc ae fd 48 8b 54 24 78 48 b8 00 00 00 00 00 fc ff df
RSP: 0018:ffffc9000454fac0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000020000 RCX: ffffffff845b3929
RDX: ffff8880272e9f00 RSI: ffffffff845b42e6 RDI: ffff8880272e9f00
RBP: 00000000fffffff4 R08: 0000000000000005 R09: 0000000000000000
R10: 00000000fffffff4 R11: 0000000000000000 R12: 000000000001ffff
R13: 0000000000000fea R14: ffff888068d78000 R15: 0000000000000016
FS: 0000000000000000(0000) GS:ffff888123ede000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3ea6fb CR3: 000000001cbb3000 CR4: 0000000000350ef0
Call Trace:
<TASK>
btrfs_work_helper+0x214/0xc70 fs/btrfs/async-thread.c:312
process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
process_scheduled_works kernel/workqueue.c:3405 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:compress_file_range+0x1e27/0x2430 fs/btrfs/inode.c:977
Code: af 0c 01 e8 db 39 8a fd e9 55 fd ff ff e8 51 fc ae fd 48 c7 c6 20 1d 28 8c 48 89 df e8 a2 ab ff fd 90 0f 0b e8 3a fc ae fd 90 <0f> 0b e8 32 fc ae fd 48 8b 54 24 78 48 b8 00 00 00 00 00 fc ff df
RSP: 0018:ffffc9000454fac0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000020000 RCX: ffffffff845b3929
RDX: ffff8880272e9f00 RSI: ffffffff845b42e6 RDI: ffff8880272e9f00
RBP: 00000000fffffff4 R08: 0000000000000005 R09: 0000000000000000
R10: 00000000fffffff4 R11: 0000000000000000 R12: 000000000001ffff
R13: 0000000000000fea R14: ffff888068d78000 R15: 0000000000000016
FS: 0000000000000000(0000) GS:ffff888123dde000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f16bf558fb0 CR3: 000000007c548000 CR4: 0000000000350ef0
---
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:
#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] 2+ messages in thread
* Re: [syzbot] [btrfs?] kernel BUG in compress_file_range
2026-08-01 0:25 [syzbot] [btrfs?] kernel BUG in compress_file_range syzbot
@ 2026-08-01 5:31 ` Qu Wenruo
0 siblings, 0 replies; 2+ messages in thread
From: Qu Wenruo @ 2026-08-01 5:31 UTC (permalink / raw)
To: syzbot, clm, dsterba, linux-btrfs, linux-kernel, syzkaller-bugs
在 2026/8/1 09:55, syzbot 写道:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: f5098b6bae76 Linux 7.2-rc5
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=17829632580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=b7079b368dcec295
> dashboard link: https://syzkaller.appspot.com/bug?extid=db04810ad3d91a0a4697
> compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
>
> Unfortunately, I don't have any reproducer for this issue yet.
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/b18067cdf26c/disk-f5098b6b.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/2b364c33a0f2/vmlinux-f5098b6b.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/2dfce6f90a4d/bzImage-f5098b6b.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+db04810ad3d91a0a4697@syzkaller.appspotmail.com
>
> ------------[ cut here ]------------
> kernel BUG at fs/btrfs/inode.c:977!
This one is from the BUG_ON() of memory allocation.
We need to properly handle the memory allocation error.
Thanks for the report,
Qu
> Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
> CPU: 1 UID: 0 PID: 752 Comm: kworker/u8:6 Not tainted syzkaller #0 PREEMPT(full)
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
> Workqueue: btrfs-delalloc btrfs_work_helper
> RIP: 0010:compress_file_range+0x1e27/0x2430 fs/btrfs/inode.c:977
> Code: af 0c 01 e8 db 39 8a fd e9 55 fd ff ff e8 51 fc ae fd 48 c7 c6 20 1d 28 8c 48 89 df e8 a2 ab ff fd 90 0f 0b e8 3a fc ae fd 90 <0f> 0b e8 32 fc ae fd 48 8b 54 24 78 48 b8 00 00 00 00 00 fc ff df
> RSP: 0018:ffffc9000454fac0 EFLAGS: 00010293
> RAX: 0000000000000000 RBX: 0000000000020000 RCX: ffffffff845b3929
> RDX: ffff8880272e9f00 RSI: ffffffff845b42e6 RDI: ffff8880272e9f00
> RBP: 00000000fffffff4 R08: 0000000000000005 R09: 0000000000000000
> R10: 00000000fffffff4 R11: 0000000000000000 R12: 000000000001ffff
> R13: 0000000000000fea R14: ffff888068d78000 R15: 0000000000000016
> FS: 0000000000000000(0000) GS:ffff888123ede000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 000000110c3ea6fb CR3: 000000001cbb3000 CR4: 0000000000350ef0
> Call Trace:
> <TASK>
> btrfs_work_helper+0x214/0xc70 fs/btrfs/async-thread.c:312
> process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
> process_scheduled_works kernel/workqueue.c:3405 [inline]
> worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486
> kthread+0x370/0x450 kernel/kthread.c:436
> ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
> ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
> </TASK>
> Modules linked in:
> ---[ end trace 0000000000000000 ]---
> RIP: 0010:compress_file_range+0x1e27/0x2430 fs/btrfs/inode.c:977
> Code: af 0c 01 e8 db 39 8a fd e9 55 fd ff ff e8 51 fc ae fd 48 c7 c6 20 1d 28 8c 48 89 df e8 a2 ab ff fd 90 0f 0b e8 3a fc ae fd 90 <0f> 0b e8 32 fc ae fd 48 8b 54 24 78 48 b8 00 00 00 00 00 fc ff df
> RSP: 0018:ffffc9000454fac0 EFLAGS: 00010293
> RAX: 0000000000000000 RBX: 0000000000020000 RCX: ffffffff845b3929
> RDX: ffff8880272e9f00 RSI: ffffffff845b42e6 RDI: ffff8880272e9f00
> RBP: 00000000fffffff4 R08: 0000000000000005 R09: 0000000000000000
> R10: 00000000fffffff4 R11: 0000000000000000 R12: 000000000001ffff
> R13: 0000000000000fea R14: ffff888068d78000 R15: 0000000000000016
> FS: 0000000000000000(0000) GS:ffff888123dde000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f16bf558fb0 CR3: 000000007c548000 CR4: 0000000000350ef0
>
>
> ---
> 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:
> #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] 2+ messages in thread
end of thread, other threads:[~2026-08-01 5:31 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2026-08-01 0:25 [syzbot] [btrfs?] kernel BUG in compress_file_range syzbot
2026-08-01 5:31 ` Qu Wenruo
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox