rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P9734/1:b..l P3545/1:b..l
(detected by 1, t=10502 jiffies, g=36697, q=146)
task:udevd state:R running task stack:22176 pid: 3545 ppid: 1 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5029 [inline]
__schedule+0x12c4/0x45b0 kernel/sched/core.c:6375
preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:6551
preempt_schedule+0xd9/0xe0 kernel/sched/core.c:6576
preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
__raw_spin_unlock include/linux/spinlock_api_smp.h:152 [inline]
_raw_spin_unlock+0x36/0x40 kernel/locking/spinlock.c:186
fast_dput+0x125/0x290
dput+0xb7/0x1a0 fs/dcache.c:880
step_into+0x352/0xe90 fs/namei.c:1815
walk_component+0x359/0x610 fs/namei.c:1982
link_path_walk+0x642/0xd90
path_lookupat+0xa9/0x450 fs/namei.c:2454
filename_lookup+0x230/0x5c0 fs/namei.c:2484
user_path_at_empty+0x40/0x180 fs/namei.c:2883
do_readlinkat+0x114/0x3a0 fs/stat.c:442
__do_sys_readlink fs/stat.c:475 [inline]
__se_sys_readlink fs/stat.c:472 [inline]
__x64_sys_readlink+0x7b/0x90 fs/stat.c:472
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f651f9fdd47
RSP: 002b:00007fff57f30fa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000059
RAX: ffffffffffffffda RBX: 00007fff57f30fb8 RCX: 00007f651f9fdd47
RDX: 0000000000000400 RSI: 00007fff57f30fb8 RDI: 00007fff57f31498
RBP: 0000000000000400 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000246 R12: 00007fff57f31498
R13: 00007fff57f31408 R14: 000055a840c38910 R15: 0000000000000000
task:syz.3.1515 state:R running task stack:26744 pid: 9734 ppid: 4176 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5029 [inline]
__schedule+0x12c4/0x45b0 kernel/sched/core.c:6375
preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6779
irqentry_exit+0x53/0x80 kernel/entry/common.c:432
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:rcu_is_watching+0x63/0xa0 kernel/rcu/tree.c:1124
Code: 89 f7 e8 90 41 5f 00 48 c7 c3 c8 b2 03 00 49 03 1e 48 89 d8 48 c1 e8 03 42 0f b6 04 38 84 c0 75 1a 8b 03 65 ff 0d 25 22 97 7e <74> 08 24 01 5b 41 5e 41 5f c3 e8 06 3f 95 ff eb f1 89 d9 80 e1 07
RSP: 0018:ffffc90003b37680 EFLAGS: 00000286
RAX: 0000000000011fc1 RBX: ffff8880b8e3b2c8 RCX: ffff88802b1f8000
RDX: dffffc0000000000 RSI: ffffffff8af9fa60 RDI: ffffffff8af9fa20
RBP: ffffea0001735b00 R08: dffffc0000000000 R09: fffffbfff2131e19
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: 1ffff11002e8d5fb R14: ffffffff8c5ce810 R15: dffffc0000000000
rcu_read_lock_held_common kernel/rcu/update.c:108 [inline]
rcu_read_lock_held+0x11/0x40 kernel/rcu/update.c:309
get_mem_cgroup_from_mm+0xa3/0x260 mm/memcontrol.c:988
__mem_cgroup_charge+0x12/0x80 mm/memcontrol.c:6802
mem_cgroup_charge include/linux/memcontrol.h:700 [inline]
shmem_add_to_page_cache+0xc22/0x17c0 mm/shmem.c:718
shmem_getpage_gfp+0x1aa1/0x3190 mm/shmem.c:1940
shmem_getpage mm/shmem.c:151 [inline]
shmem_write_begin+0xce/0x1a0 mm/shmem.c:2474
generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3785
__generic_file_write_iter+0x243/0x4f0 mm/filemap.c:3912
generic_file_write_iter+0xa7/0x1b0 mm/filemap.c:3944
call_write_iter include/linux/fs.h:2172 [inline]
new_sync_write fs/read_write.c:507 [inline]
vfs_write+0xacd/0xe50 fs/read_write.c:594
ksys_write+0x1a2/0x2c0 fs/read_write.c:647
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f4b39cd9c1f
RSP: 002b:00007f4b37b22df0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000400000 RCX: 00007f4b39cd9c1f
RDX: 0000000000400000 RSI: 00007f4b2f703000 RDI: 0000000000000008
RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000000121c
R10: 0000000000000002 R11: 0000000000000293 R12: 0000000000000008
R13: 00007f4b37b22ef0 R14: 00007f4b37b22eb0 R15: 00007f4b2f703000
rcu: rcu_preempt kthread starved for 10568 jiffies! g36697 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:R running task stack:26368 pid: 15 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5029 [inline]
__schedule+0x12c4/0x45b0 kernel/sched/core.c:6375
preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6779
irqentry_exit+0x53/0x80 kernel/entry/common.c:432
asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:681
RIP: 0010:__free_object+0x9aa/0xa80 lib/debugobjects.c:419
Code: 84 24 80 00 00 00 42 80 3c 2b 00 74 08 4c 89 f7 e8 5b 9e b1 fd f6 84 24 81 00 00 00 02 75 5a f7 44 24 10 00 02 00 00 74 01 fb <48> c7 44 24 60 0e 36 e0 45 48 8b 44 24 40 49 c7 44 05 00 00 00 00
RSP: 0018:ffffc90000d47960 EFLAGS: 00000206
RAX: f47e3eda877fa100 RBX: 1ffff920001a8f40 RCX: ffffffff96a95f03
RDX: dffffc0000000000 RSI: ffffffff8aab2a60 RDI: ffffffff8af9fa80
RBP: ffffc90000d47b38 R08: ffffffff81871b70 R09: ffffc90000d47a40
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8880b8f36fd8
R13: dffffc0000000000 R14: ffffc90000d47a00 R15: ffff8880b8f36fd0
free_object lib/debugobjects.c:427 [inline]
debug_object_free+0x2c1/0x460 lib/debugobjects.c:852
destroy_timer_on_stack kernel/time/timer.c:759 [inline]
schedule_timeout+0x1d0/0x300 kernel/time/timer.c:1918
rcu_gp_fqs_loop+0x2bf/0x1080 kernel/rcu/tree.c:1972
rcu_gp_kthread+0xa4/0x360 kernel/rcu/tree.c:2145
kthread+0x3f6/0x4f0 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 9745 Comm: syz.0.1516 Not tainted 5.15.179-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:pv_queued_spin_unlock arch/x86/include/asm/paravirt.h:590 [inline]
RIP: 0010:queued_spin_unlock arch/x86/include/asm/qspinlock.h:56 [inline]
RIP: 0010:do_raw_spin_unlock+0x129/0x8b0 kernel/locking/spinlock_debug.c:141
Code: 06 ff ff ff ff 48 c7 c0 b8 29 99 8c 48 c1 e8 03 80 3c 28 00 74 0c 48 c7 c7 b8 29 99 8c e8 9f 32 66 00 48 83 3d 3f cd 34 0b 00 <0f> 84 9a 05 00 00 4c 89 ff e8 79 d8 ff ff 66 90 48 83 c4 28 5b 41
RSP: 0018:ffffc90003c37d10 EFLAGS: 00000086
RAX: 1ffffffff1932537 RBX: 1ffff110055d1a69 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88802ae8d340
RBP: dffffc0000000000 R08: dffffc0000000000 R09: ffffed10055d1a69
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff110055d1a6a
R13: ffff88802ae8d350 R14: ffff88802ae8d348 R15: ffff88802ae8d340
FS: 00007f8adcce36c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c44c59d CR3: 00000000532cc000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:167 [inline]
_raw_spin_unlock_irq+0x1a/0x40 kernel/locking/spinlock.c:202
spin_unlock_irq include/linux/spinlock.h:413 [inline]
__set_current_blocked+0x2a5/0x2f0 kernel/signal.c:3088
__do_sys_rt_sigreturn+0x181/0x250 arch/x86/kernel/signal.c:672
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f8adee37359
Code: 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec 48 01 00 00 49 89 d0 64 48 8b 04 25
RSP: 002b:00007f8adcce2b40 EFLAGS: 00000206 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007f8adf0b4088 RCX: 00007f8adee37359
RDX: 00007f8adcce2b40 RSI: 00007f8adcce2c70 RDI: 0000000000000021
RBP: 00007f8adf0b4080 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 00007f8adf0b408c
R13: 0000000000000000 R14: 00007ffefecd4770 R15: 00007ffefecd4858