[v5.15] WARNING in __btrfs_unlink_inode

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 3a5928702e71 Linux 5.15.167
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=12d5e207980000
kernel config: https://syzkaller.appspot.com/x/.config?x=171882977b524c53
dashboard link: https://syzkaller.appspot.com/bug?extid=c80d64708c6855389daa
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/22ee27cb312d/disk-3a592870.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/90bf6a3e3d20/vmlinux-3a592870.xz
kernel image: https://storage.googleapis.com/syzbot-assets/096dd2c73ac3/Image-3a592870.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c80d64...@syzkaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 1 PID: 5887 at fs/btrfs/inode.c:4167 __btrfs_unlink_inode+0x950/0xb3c fs/btrfs/inode.c:4167
Modules linked in:
CPU: 1 PID: 5887 Comm: syz.4.350 Not tainted 5.15.167-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __btrfs_unlink_inode+0x950/0xb3c fs/btrfs/inode.c:4167
lr : __btrfs_unlink_inode+0x950/0xb3c fs/btrfs/inode.c:4167
sp : ffff8000208679c0
x29: ffff800020867a60 x28: ffff800020867a20 x27: 1ffff0000410cf40
x26: 0000000000000104 x25: 00000000fffffff4 x24: ffff0000c0fd6d10
x23: ffff0000e64306e0 x22: 1ffff0000410cf44 x21: dfff800000000000
x20: 1fffe0001cc860e7 x19: ffff0000e6430738 x18: 0000000000000001
x17: 0000000000000000 x16: ffff800011ac23e0 x15: 00000000ffffffff
x14: ffff0000cba50000 x13: 0000000000000001 x12: 0000000000000001
x11: 0000000000000000 x10: 0000000000000000 x9 : 4d0a6e7a7531b500
x8 : 4d0a6e7a7531b500 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff800020867138 x4 : ffff800014b9fae0 x3 : ffff800008557c4c
x2 : 0000000000000001 x1 : 0000000100000000 x0 : 0000000000000026
Call trace:
__btrfs_unlink_inode+0x950/0xb3c fs/btrfs/inode.c:4167
btrfs_unlink_inode fs/btrfs/inode.c:4215 [inline]
btrfs_unlink+0x10c/0x254 fs/btrfs/inode.c:4258
vfs_unlink+0x2f0/0x508 fs/namei.c:4280
do_unlinkat+0x4cc/0x830 fs/namei.c:4348
__do_sys_unlinkat fs/namei.c:4391 [inline]
__se_sys_unlinkat fs/namei.c:4384 [inline]
__arm64_sys_unlinkat+0xcc/0xfc fs/namei.c:4384
__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: 82010
hardirqs last enabled at (82009): [<ffff80000832c17c>] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:257
hardirqs last disabled at (82010): [<ffff800011abda6c>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396
softirqs last enabled at (81986): [<ffff8000081b6d74>] softirq_handle_end kernel/softirq.c:401 [inline]
softirqs last enabled at (81986): [<ffff8000081b6d74>] handle_softirqs+0xb88/0xdbc kernel/softirq.c:586
softirqs last disabled at (81881): [<ffff8000081b740c>] __do_softirq kernel/softirq.c:592 [inline]
softirqs last disabled at (81881): [<ffff8000081b740c>] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
softirqs last disabled at (81881): [<ffff8000081b740c>] invoke_softirq kernel/softirq.c:439 [inline]
softirqs last disabled at (81881): [<ffff8000081b740c>] __irq_exit_rcu+0x268/0x4d8 kernel/softirq.c:641
---[ end trace 45418c6a8f0a94c2 ]---
BTRFS: error (device loop4) in __btrfs_unlink_inode:4167: errno=-12 Out of memory
BTRFS info (device loop4): forced readonly


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[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: 3a5928702e71 Linux 5.15.167
git tree: linux-5.15.y

console output: https://syzkaller.appspot.com/x/log.txt?x=1112e8a9980000

kernel config: https://syzkaller.appspot.com/x/.config?x=171882977b524c53
dashboard link: https://syzkaller.appspot.com/bug?extid=c80d64708c6855389daa
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12ba869f980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17bde207980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/22ee27cb312d/disk-3a592870.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/90bf6a3e3d20/vmlinux-3a592870.xz
kernel image: https://storage.googleapis.com/syzbot-assets/096dd2c73ac3/Image-3a592870.gz.xz

mounted in repro: https://storage.googleapis.com/syzbot-assets/1a4ba5ee495e/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c80d64...@syzkaller.appspotmail.com

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: 4024 at fs/btrfs/inode.c:4167 __btrfs_unlink_inode+0x950/0xb3c fs/btrfs/inode.c:4167
Modules linked in:
CPU: 0 PID: 4024 Comm: syz-executor385 Not tainted 5.15.167-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __btrfs_unlink_inode+0x950/0xb3c fs/btrfs/inode.c:4167
lr : __btrfs_unlink_inode+0x950/0xb3c fs/btrfs/inode.c:4167

sp : ffff8000200d79c0
x29: ffff8000200d7a60 x28: ffff8000200d7a20 x27: 1ffff0000401af40
x26: 0000000000000104 x25: 00000000fffffff4 x24: ffff0000d5914f20
x23: ffff0000dbe000b0 x22: 1ffff0000401af44 x21: dfff800000000000
x20: 1fffe0001b7c0021 x19: ffff0000dbe00108 x18: 0000000000000001

x17: 0000000000000000 x16: ffff800011ac23e0 x15: 00000000ffffffff

x14: ffff0000ccb21b40 x13: 0000000000000001 x12: 0000000000000001
x11: 0000000000000000 x10: 0000000000000000 x9 : 49f2997804009200
x8 : 49f2997804009200 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff8000200d7138 x4 : ffff800014b9fae0 x3 : ffff800008557c4c

x2 : 0000000000000001 x1 : 0000000100000000 x0 : 0000000000000026
Call trace:
__btrfs_unlink_inode+0x950/0xb3c fs/btrfs/inode.c:4167
btrfs_unlink_inode fs/btrfs/inode.c:4215 [inline]
btrfs_unlink+0x10c/0x254 fs/btrfs/inode.c:4258
vfs_unlink+0x2f0/0x508 fs/namei.c:4280
do_unlinkat+0x4cc/0x830 fs/namei.c:4348
__do_sys_unlinkat fs/namei.c:4391 [inline]
__se_sys_unlinkat fs/namei.c:4384 [inline]
__arm64_sys_unlinkat+0xcc/0xfc fs/namei.c:4384
__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: 86080
hardirqs last enabled at (86079): [<ffff80000832c17c>] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:257
hardirqs last disabled at (86080): [<ffff800011abda6c>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396
softirqs last enabled at (86060): [<ffff8000081b6d74>] softirq_handle_end kernel/softirq.c:401 [inline]
softirqs last enabled at (86060): [<ffff8000081b6d74>] handle_softirqs+0xb88/0xdbc kernel/softirq.c:586
softirqs last disabled at (85961): [<ffff8000081b740c>] __do_softirq kernel/softirq.c:592 [inline]
softirqs last disabled at (85961): [<ffff8000081b740c>] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
softirqs last disabled at (85961): [<ffff8000081b740c>] invoke_softirq kernel/softirq.c:439 [inline]
softirqs last disabled at (85961): [<ffff8000081b740c>] __irq_exit_rcu+0x268/0x4d8 kernel/softirq.c:641
---[ end trace 521860bb0a8358a2 ]---
BTRFS: error (device loop0) in __btrfs_unlink_inode:4167: errno=-12 Out of memory
BTRFS info (device loop0): forced readonly


---
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