WARNING in btrfs_clear_free_space_tree

Status: upstream: reported C repro on 2024/03/06 06:07
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+6773feba26320e20631d@syzkaller.appspotmail.com
First crash: 905d, last: 32d
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (1)
Date Name Commit Repro Result
2024/03/06 upstream (ToT) 5847c9777c30 C [report] BUG: MAX_LOCKDEP_KEYS too low!
▶ ▼ Last patch testing requests (7)
Created Duration User Patch Repo Result
2026/07/26 09:01 15m retest repro linux-5.15.y report log
2026/05/16 08:23 16m retest repro linux-5.15.y report log
2026/02/16 10:08 18m retest repro linux-5.15.y report log
2025/12/08 04:20 11m retest repro linux-5.15.y report log
2025/09/27 07:51 17m retest repro linux-5.15.y report log
2025/07/17 20:46 10m retest repro linux-5.15.y report log
2025/05/08 05:21 12m retest repro linux-5.15.y report log

Sample crash report:
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
------------[ cut here ]------------
WARNING: CPU: 0 PID: 4089 at fs/btrfs/free-space-tree.c:1267 btrfs_clear_free_space_tree+0x6bc/0x9bc fs/btrfs/free-space-tree.c:1267
Modules linked in:
CPU: 0 PID: 4089 Comm: syz-executor298 Not tainted 5.15.150-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : btrfs_clear_free_space_tree+0x6bc/0x9bc fs/btrfs/free-space-tree.c:1267
lr : btrfs_clear_free_space_tree+0x6bc/0x9bc fs/btrfs/free-space-tree.c:1267
sp : ffff80001d2977a0
x29: ffff80001d297840 x28: 1fffe0001817700b x27: dfff800000000000
x26: ffff700003a52ef8 x25: ffff0000d057e0bb x24: ffff0000dbe470b0
x23: 0000000000000006 x22: 00000000fffffff4 x21: ffff0000c0bb99d0
x20: ffff0000dbe47108 x19: 1fffe0001b7c8e21 x18: 0000000000000001
x17: 0000000000000000 x16: ffff8000119749f4 x15: 00000000ffffffff
x14: ffff0000c2351b40 x13: 0000000000000001 x12: 0000000000000001
x11: 0000000000000000 x10: 0000000000000000 x9 : 4cb9f81c53150000
x8 : 4cb9f81c53150000 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff80001d296f18 x4 : ffff8000149ef720 x3 : ffff80000854e218
x2 : 0000000000000001 x1 : 0000000100000000 x0 : 0000000000000026
Call trace:
 btrfs_clear_free_space_tree+0x6bc/0x9bc fs/btrfs/free-space-tree.c:1267
 btrfs_start_pre_rw_mount+0x24c/0x578 fs/btrfs/disk-io.c:3079
 btrfs_remount+0xb88/0x130c fs/btrfs/super.c:2082
 legacy_reconfigure+0xfc/0x114 fs/fs_context.c:634
 reconfigure_super+0x1d0/0x6ec fs/super.c:925
 do_remount fs/namespace.c:2661 [inline]
 path_mount+0xbec/0x101c fs/namespace.c:3327
 do_mount fs/namespace.c:3348 [inline]
 __do_sys_mount fs/namespace.c:3556 [inline]
 __se_sys_mount fs/namespace.c:3533 [inline]
 __arm64_sys_mount+0x510/0x5e0 fs/namespace.c:3533
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
irq event stamp: 70572
hardirqs last  enabled at (70571): [<ffff80000832a794>] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:257
hardirqs last disabled at (70572): [<ffff800011970080>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396
softirqs last  enabled at (70562): [<ffff800008021c64>] softirq_handle_end kernel/softirq.c:401 [inline]
softirqs last  enabled at (70562): [<ffff800008021c64>] __do_softirq+0xb5c/0xdb0 kernel/softirq.c:587
softirqs last disabled at (70541): [<ffff8000081b6568>] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
softirqs last disabled at (70541): [<ffff8000081b6568>] invoke_softirq kernel/softirq.c:439 [inline]
softirqs last disabled at (70541): [<ffff8000081b6568>] __irq_exit_rcu+0x264/0x4d4 kernel/softirq.c:637
---[ end trace 4130c4a767e44005 ]---
BTRFS: error (device loop0) in btrfs_clear_free_space_tree:1267: errno=-12 Out of memory
BTRFS warning (device loop0): failed to clear free space tree: -12

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/03/06 06:46 linux-5.15.y 80efc6265290 f39a7eed .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_clear_free_space_tree
2024/03/06 06:06 linux-5.15.y 80efc6265290 f39a7eed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in btrfs_clear_free_space_tree
* Struck through repros no longer work on HEAD.