INFO: task syz.3.2164:21429 blocked for more than 143 seconds.
Not tainted syzkaller #0
task:syz.3.2164 state:D stack:26008 pid:21429 tgid:21428 ppid:18869 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5504 [inline]
__schedule+0x16dc/0x5500 kernel/sched/core.c:7228
__schedule_loop kernel/sched/core.c:7307 [inline]
rt_mutex_schedule+0x76/0xf0 kernel/sched/core.c:7603
rt_mutex_slowlock_block kernel/locking/rtmutex.c:1670 [inline]
__rt_mutex_slowlock kernel/locking/rtmutex.c:1747 [inline]
__rt_mutex_slowlock_locked+0x1f84/0x25b0 kernel/locking/rtmutex.c:1787
__rwbase_read_lock+0xc3/0x180 kernel/locking/rwbase_rt.c:114
rwbase_read_lock kernel/locking/rwbase_rt.c:147 [inline]
__down_read kernel/locking/rwsem.c:1502 [inline]
down_read+0x132/0x200 kernel/locking/rwsem.c:1576
__super_lock fs/super.c:60 [inline]
super_lock+0x2d6/0x3d0 fs/super.c:122
user_get_super+0xc8/0x120 fs/super.c:941
quotactl_block fs/quota/quota.c:889 [inline]
__do_sys_quotactl fs/quota/quota.c:955 [inline]
__se_sys_quotactl+0x538/0x9a0 fs/quota/quota.c:917
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ffaa968ce59
RSP: 002b:00007ffaa78de028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007ffaa9905fa0 RCX: 00007ffaa968ce59
RDX: 000000000000ee01 RSI: 0000200000002e80 RDI: ffffffff80000701
RBP: 00007ffaa9722e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffaa9906038 R14: 00007ffaa9905fa0 R15: 00007ffe2d0868d8
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:122
nmi_trigger_cpumask_backtrace+0x17a/0x380 lib/nmi_backtrace.c:65
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
watchdog+0xfd7/0x1030 kernel/hung_task.c:561
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 7621 Comm: udevd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:on_stack arch/x86/include/asm/stacktrace.h:58 [inline]
RIP: 0010:stack_access_ok arch/x86/kernel/unwind_orc.c:409 [inline]
RIP: 0010:deref_stack_reg+0xa7/0x220 arch/x86/kernel/unwind_orc.c:419
Code: 4c 89 fb 48 c1 eb 03 0f b6 04 33 84 c0 0f 85 39 01 00 00 41 83 3f 00 0f 95 c0 4c 39 c5 0f 96 c1 20 c1 4d 39 c6 0f 97 c0 20 c8 <3c> 01 75 18 49 8d 40 08 48 39 e8 0f 97 c1 4c 39 f0 0f 96 c0 84 c1
RSP: 0018:ffffc9000e01f7f8 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 1ffff92001c03f1d RCX: 0000000000000001
RDX: ffffc9000e01f928 RSI: dffffc0000000000 RDI: ffffc9000e01f8f8
RBP: ffffc9000e018000 R08: ffffc9000e01fd00 R09: 0000000000000000
R10: ffffc9000e01f938 R11: fffff52001c03f29 R12: 1ffff92001c03f1e
R13: 1ffff92001c03f1f R14: ffffc9000e020000 R15: ffffc9000e01f8e8
FS: 00007fb34a837880(0000) GS:ffff888126242000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd32f41a540 CR3: 000000003e2d2000 CR4: 00000000003526f0
Call Trace:
unwind_next_frame+0x19bd/0x2550 arch/x86/kernel/unwind_orc.c:-1
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
unpoison_slab_object mm/kasan/common.c:340 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4612 [inline]
slab_alloc_node mm/slub.c:4945 [inline]
kmem_cache_alloc_noprof+0x355/0x650 mm/slub.c:4959
fsnotify_alloc_inode_connector fs/notify/mark.c:802 [inline]
fsnotify_attach_connector_to_object fs/notify/mark.c:838 [inline]
fsnotify_add_mark_list fs/notify/mark.c:922 [inline]
fsnotify_add_mark_locked+0x65f/0x1340 fs/notify/mark.c:997
fsnotify_add_inode_mark_locked include/linux/fsnotify_backend.h:913 [inline]
inotify_new_watch fs/notify/inotify/inotify_user.c:620 [inline]
inotify_update_watch fs/notify/inotify/inotify_user.c:648 [inline]
__do_sys_inotify_add_watch fs/notify/inotify/inotify_user.c:782 [inline]
__se_sys_inotify_add_watch+0xa82/0xf50 fs/notify/inotify/inotify_user.c:730
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb34a99f9a7
Code: f0 ff ff 73 01 c3 48 8b 0d 4e f4 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 fe 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 21 f4 0c 00 f7 d8 64 89 01 48
RSP: 002b:00007ffd78ca40d8 EFLAGS: 00000206 ORIG_RAX: 00000000000000fe
RAX: ffffffffffffffda RBX: 000055cf066265d0 RCX: 00007fb34a99f9a7
RDX: 0000000000000008 RSI: 000055cf06574430 RDI: 0000000000000007
RBP: 000055cf06573910 R08: 00000000000001d0 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000206 R12: 000055cf066265d0
R13: 000055cf06581190 R14: 0000000000000008 R15: 000055cf066265d0