[v5.15] WARNING in path_openat (3)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 0a51d2d4527b Linux 5.15.173
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=15c6d930580000
kernel config: https://syzkaller.appspot.com/x/.config?x=a6b3013b6f1a102b
dashboard link: https://syzkaller.appspot.com/bug?extid=110691fb91c5dec27f16
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/731bd13b5412/disk-0a51d2d4.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a53b07f54a18/vmlinux-0a51d2d4.xz
kernel image: https://storage.googleapis.com/syzbot-assets/5f1392034bb8/Image-0a51d2d4.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+110691...@syzkaller.appspotmail.com

------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff0000e8179950, owner = 0x0, curr 0xffff0000c7269b40, list empty
WARNING: CPU: 1 PID: 6681 at kernel/locking/rwsem.c:1350 __up_write kernel/locking/rwsem.c:1349 [inline]
WARNING: CPU: 1 PID: 6681 at kernel/locking/rwsem.c:1350 up_write+0x524/0x6f0 kernel/locking/rwsem.c:1604
Modules linked in:
CPU: 1 PID: 6681 Comm: syz.0.728 Not tainted 5.15.173-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __up_write kernel/locking/rwsem.c:1349 [inline]
pc : up_write+0x524/0x6f0 kernel/locking/rwsem.c:1604
lr : __up_write kernel/locking/rwsem.c:1349 [inline]
lr : up_write+0x524/0x6f0 kernel/locking/rwsem.c:1604
sp : ffff800020d676c0
x29: ffff800020d676d0 x28: ffff0000ccdec7d0 x27: ffff800020d67a18
x26: dfff800000000000 x25: 1fffe0001d02f337 x24: ffff0000e81799a8
x23: 0000000000000000 x22: 0000000000000000 x21: ffff0000c7269b40
x20: ffff0000e8179950 x19: ffff0000e8179950 x18: 1fffe00036835d8e
x17: 1fffe00036835d8e x16: ffff800011ab8a34 x15: ffff800014b5fa40
x14: 1ffff0000295806a x13: dfff800000000000 x12: 0000000000080000
x11: 000000000001d85a x10: ffff800024eab000 x9 : ec00db15ff22dd00
x8 : ec00db15ff22dd00 x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000000 x3 : ffff80000a98269c
x2 : ffff0001b41aed10 x1 : 0000000100000000 x0 : 00000000000000bd
Call trace:
__up_write kernel/locking/rwsem.c:1349 [inline]
up_write+0x524/0x6f0 kernel/locking/rwsem.c:1604
inode_unlock include/linux/fs.h:794 [inline]
open_last_lookups fs/namei.c:3536 [inline]
path_openat+0x1198/0x26cc fs/namei.c:3739
do_filp_open+0x1a8/0x3b4 fs/namei.c:3769
do_sys_openat2+0x128/0x3e0 fs/open.c:1253
do_sys_open fs/open.c:1269 [inline]
__do_sys_openat fs/open.c:1285 [inline]
__se_sys_openat fs/open.c:1280 [inline]
__arm64_sys_openat+0x1f0/0x240 fs/open.c:1280
__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: 518
hardirqs last enabled at (517): [<ffff80000826ac68>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1338 [inline]
hardirqs last enabled at (517): [<ffff80000826ac68>] finish_lock_switch+0xbc/0x1e8 kernel/sched/core.c:4781
hardirqs last disabled at (518): [<ffff800011ab40c0>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396
softirqs last enabled at (512): [<ffff8000081b691c>] softirq_handle_end kernel/softirq.c:401 [inline]
softirqs last enabled at (512): [<ffff8000081b691c>] handle_softirqs+0xb88/0xdbc kernel/softirq.c:586
softirqs last disabled at (487): [<ffff8000081b6fb4>] __do_softirq kernel/softirq.c:592 [inline]
softirqs last disabled at (487): [<ffff8000081b6fb4>] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
softirqs last disabled at (487): [<ffff8000081b6fb4>] invoke_softirq kernel/softirq.c:439 [inline]
softirqs last disabled at (487): [<ffff8000081b6fb4>] __irq_exit_rcu+0x268/0x4d8 kernel/softirq.c:641
---[ end trace 662f5c08b26a06db ]---


---
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[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: 0a51d2d4527b Linux 5.15.173
git tree: linux-5.15.y

console output: https://syzkaller.appspot.com/x/log.txt?x=1669d930580000

kernel config: https://syzkaller.appspot.com/x/.config?x=a6b3013b6f1a102b
dashboard link: https://syzkaller.appspot.com/bug?extid=110691fb91c5dec27f16
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=1169d930580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=151b4ec0580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/731bd13b5412/disk-0a51d2d4.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a53b07f54a18/vmlinux-0a51d2d4.xz
kernel image: https://storage.googleapis.com/syzbot-assets/5f1392034bb8/Image-0a51d2d4.gz.xz

mounted in repro #1: https://storage.googleapis.com/syzbot-assets/62cd8db6bfce/mount_0.gz
mounted in repro #2: https://storage.googleapis.com/syzbot-assets/a77c38b8d62e/mount_4.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+110691...@syzkaller.appspotmail.com

------------[ cut here ]------------

DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff0000debac590, owner = 0x0, curr 0xffff0000d63851c0, list empty
WARNING: CPU: 0 PID: 4931 at kernel/locking/rwsem.c:1350 __up_write kernel/locking/rwsem.c:1349 [inline]
WARNING: CPU: 0 PID: 4931 at kernel/locking/rwsem.c:1350 up_write+0x524/0x6f0 kernel/locking/rwsem.c:1604
Modules linked in:
CPU: 0 PID: 4931 Comm: syz-executor146 Not tainted 5.15.173-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __up_write kernel/locking/rwsem.c:1349 [inline]
pc : up_write+0x524/0x6f0 kernel/locking/rwsem.c:1604
lr : __up_write kernel/locking/rwsem.c:1349 [inline]
lr : up_write+0x524/0x6f0 kernel/locking/rwsem.c:1604

sp : ffff8000216276c0
x29: ffff8000216276d0 x28: ffff0000d10087d0 x27: ffff800021627a18
x26: dfff800000000000 x25: 1fffe0001bd758bf x24: ffff0000debac5e8
x23: 0000000000000000 x22: 0000000000000000 x21: ffff0000d63851c0
x20: ffff0000debac590 x19: ffff0000debac590 x18: 0000000000000000
x17: 0000000000000000 x16: ffff800011ab8a34 x15: 0000000000000005
x14: 1ffff0000295806a x13: dfff800000000000 x12: 0000000000000001
x11: 0000000000000000 x10: 0000000000000000 x9 : 64620b213f6ffb00
x8 : 64620b213f6ffb00 x7 : 0000000000000000 x6 : 0000000000000000

x5 : 0000000000000080 x4 : 0000000000000000 x3 : ffff80000a98269c

x2 : ffff0001b418dd10 x1 : 0000000100000000 x0 : 00000000000000bd

Call trace:
__up_write kernel/locking/rwsem.c:1349 [inline]
up_write+0x524/0x6f0 kernel/locking/rwsem.c:1604
inode_unlock include/linux/fs.h:794 [inline]
open_last_lookups fs/namei.c:3536 [inline]
path_openat+0x1198/0x26cc fs/namei.c:3739
do_filp_open+0x1a8/0x3b4 fs/namei.c:3769
do_sys_openat2+0x128/0x3e0 fs/open.c:1253
do_sys_open fs/open.c:1269 [inline]
__do_sys_openat fs/open.c:1285 [inline]
__se_sys_openat fs/open.c:1280 [inline]
__arm64_sys_openat+0x1f0/0x240 fs/open.c:1280
__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: 378
hardirqs last enabled at (377): [<ffff80000826ac68>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1338 [inline]
hardirqs last enabled at (377): [<ffff80000826ac68>] finish_lock_switch+0xbc/0x1e8 kernel/sched/core.c:4781
hardirqs last disabled at (378): [<ffff800011ab40c0>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396
softirqs last enabled at (372): [<ffff8000081b691c>] softirq_handle_end kernel/softirq.c:401 [inline]
softirqs last enabled at (372): [<ffff8000081b691c>] handle_softirqs+0xb88/0xdbc kernel/softirq.c:586
softirqs last disabled at (261): [<ffff8000081b6fb4>] __do_softirq kernel/softirq.c:592 [inline]
softirqs last disabled at (261): [<ffff8000081b6fb4>] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
softirqs last disabled at (261): [<ffff8000081b6fb4>] invoke_softirq kernel/softirq.c:439 [inline]
softirqs last disabled at (261): [<ffff8000081b6fb4>] __irq_exit_rcu+0x268/0x4d8 kernel/softirq.c:641
---[ end trace bd71198619bb34b6 ]---


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