kernel BUG in insert_state

Status: upstream: reported C repro on 2025/02/17 01:39
Bug presence: origin:upstream
Labels: missing-backport
[Documentation on labels]
Reported-by: syzbot+6a7319ed74eea021cf05@syzkaller.appspotmail.com
First crash: 530d, last: 47d
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (3)
Date Name Commit Repro Result
2025/08/03 linux-6.1.y (ToT) 3594f306da12 C [report] kernel BUG in insert_state
2025/03/17 upstream (ToT) 4701f33a1070 C [report] BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
2025/08/03 upstream (ToT) 186f3edfdd41 C Didn't crash
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream kernel BUG in insert_state btrfs -1 3 1244d 1295d 0/29 auto-obsoleted due to no activity on 2023/07/03 23:50
upstream kernel BUG in insert_state (2) btrfs -1 syz, C error done 7 770d 1071d 0/29 auto-obsoleted due to no activity on 2024/09/30 07:00
▶ ▼ Fix bisection attempts (2)
Created Duration User Patch Repo Result
2025/10/17 03:41 2h20m fix candidate upstream OK (0) job log
2025/03/20 07:00 16m bisect fix linux-6.1.y error job log

Sample crash report:
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
------------[ cut here ]------------
kernel BUG at fs/btrfs/extent-io-tree.c:381!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 4507 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/26/2026
pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : set_state_bits fs/btrfs/extent-io-tree.c:381 [inline]
pc : insert_state+0x364/0x368 fs/btrfs/extent-io-tree.c:403
lr : set_state_bits fs/btrfs/extent-io-tree.c:381 [inline]
lr : insert_state+0x364/0x368 fs/btrfs/extent-io-tree.c:403
sp : ffff8000212275e0
x29: ffff8000212275e0 x28: 00000000fffe5eff x27: 1fffe0001ac063b1
x26: dfff800000000000 x25: 0000000000000000 x24: 0000000000000fff
x23: 0000000000001000 x22: 00000000fffffff4 x21: 0000000000000fff
x20: ffff0000f2841400 x19: ffff0000d6031d80 x18: 0000000000000000
x17: 0000000000000000 x16: ffff8000082d92bc x15: 0000000000000000
x14: 0000000000000001 x13: 1ffff00002a9af86 x12: 0000000000ff0100
x11: ff0080000a18cc20 x10: 0000000000000000 x9 : ffff80000a18cc20
x8 : ffff0000c6d11bc0 x7 : 0000000000000001 x6 : 0000000000000001
x5 : 00000000ffffffff x4 : 0000000000000a20 x3 : 0000000000000a20
x2 : 0000000000000038 x1 : 00000000fffffff4 x0 : 0000000000000000
Call trace:
 set_state_bits fs/btrfs/extent-io-tree.c:381 [inline]
 insert_state+0x364/0x368 fs/btrfs/extent-io-tree.c:403
 __set_extent_bit+0x1154/0x1964 fs/btrfs/extent-io-tree.c:1115
 set_record_extent_bits+0x68/0x98 fs/btrfs/extent-io-tree.c:1607
 qgroup_reserve_data+0x20c/0x8d4 fs/btrfs/qgroup.c:3817
 btrfs_qgroup_reserve_data+0x40/0xec fs/btrfs/qgroup.c:3860
 btrfs_check_data_free_space+0x12c/0x208 fs/btrfs/delalloc-space.c:152
 btrfs_truncate_block+0x184/0xe34 fs/btrfs/inode.c:4969
 btrfs_punch_hole fs/btrfs/file.c:2682 [inline]
 btrfs_fallocate+0x96c/0x1720 fs/btrfs/file.c:3102
 vfs_fallocate+0x4a4/0x5f4 fs/open.c:323
 ksys_fallocate fs/open.c:346 [inline]
 __do_sys_fallocate fs/open.c:354 [inline]
 __se_sys_fallocate fs/open.c:352 [inline]
 __arm64_sys_fallocate+0xc0/0x110 fs/open.c:352
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
Code: aa1903e0 979d6a2b 17ffff54 978c7a5f (d4210000) 
---[ end trace 0000000000000000 ]---

Crashes (9):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/04/09 17:15 linux-6.1.y 1989cd3d56e2 38c8e246 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-linux-6-1-kasan-arm64 kernel BUG in insert_state
2025/02/17 02:47 linux-6.1.y 0cbb5f65e52f 40a34ec9 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-linux-6-1-kasan-arm64 kernel BUG in insert_state
2025/02/17 02:12 linux-6.1.y 0cbb5f65e52f 40a34ec9 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-linux-6-1-kasan-arm64 kernel BUG in insert_state
2026/06/14 22:19 linux-6.1.y 228da13e907e 1d2f3589 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in insert_state
2026/05/13 08:16 linux-6.1.y ad16b162f21d a0949470 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in insert_state
2026/04/09 16:25 linux-6.1.y 1989cd3d56e2 38c8e246 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in insert_state
2025/11/28 21:04 linux-6.1.y f6e38ae624cf d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in insert_state
2025/09/30 01:33 linux-6.1.y 7b34dc04e4ff 86341da6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in insert_state
2025/02/17 01:38 linux-6.1.y 0cbb5f65e52f 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in insert_state
* Struck through repros no longer work on HEAD.