[v5.15] INFO: rcu detected stall in sys_close (2)
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syzbot
Nov 16, 2025, 11:01:37 PM (2 days ago) Nov 16
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: cc5ec8769306 Linux 5.15.196
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=124ba692580000
kernel config: https://syzkaller.appspot.com/x/.config?x=e1bb6d24ef2164eb
dashboard link: https://syzkaller.appspot.com/bug?extid=98e454ff02bc9b001cbc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/c71c660545b2/disk-cc5ec876.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/4f011826cca6/vmlinux-cc5ec876.xz
kernel image: https://storage.googleapis.com/syzbot-assets/8ccd1a2c3f8c/bzImage-cc5ec876.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+98e454...@syzkaller.appspotmail.com
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-...!: (0 ticks this GP) idle=50d/1/0x4000000000000000 softirq=21175/21175 fqs=0
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P3561/1:b..l
(detected by 1, t=10502 jiffies, g=27965, q=1826)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4188 Comm: udevd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:mark_lock+0xa/0x320 kernel/locking/lockdep.c:4552
Code: 8d e8 aa 83 5f 00 4c 89 f7 41 89 d9 e9 79 ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 41 57 41 56 41 55 41 54 53 <50> 89 d5 49 89 f6 48 89 fb 49 bd 00 00 00 00 00 fc ff df 83 fa 08
RSP: 0018:ffffc90000007828 EFLAGS: 00000006
RAX: 00000000000c4000 RBX: 0000000000000001 RCX: ffffffff815cb124
RDX: 0000000000000008 RSI: ffff88801a5a8b18 RDI: ffff88801a5a8000
RBP: ffffc90000007ab0 R08: dffffc0000000000 R09: fffffbfff1ff7c19
R10: fffffbfff1ff7c19 R11: 1ffffffff1ff7c18 R12: ffff88801a5a8b38
R13: ffff88801a5a8000 R14: ffffffff8f94a5f8 R15: ffff88801a5a8b18
FS: 00007fdacdc2e880(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3261bff8 CR3: 0000000062513000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
mark_usage kernel/locking/lockdep.c:4512 [inline]
__lock_acquire+0xd5a/0x7c60 kernel/locking/lockdep.c:4966
lock_acquire+0x197/0x3f0 kernel/locking/lockdep.c:5623
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xa4/0xf0 kernel/locking/spinlock.c:162
debug_object_deactivate+0x63/0x340 lib/debugobjects.c:749
debug_hrtimer_deactivate kernel/time/hrtimer.c:415 [inline]
debug_deactivate+0x1d/0x1c0 kernel/time/hrtimer.c:471
__run_hrtimer kernel/time/hrtimer.c:1653 [inline]
__hrtimer_run_queues+0x2db/0xc40 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
__sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1108
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:_raw_spin_lock+0x0/0x40 kernel/locking/spinlock.c:153
Code: 21 a9 f7 48 83 c4 08 eb 0f 48 89 df be 01 02 00 00 e8 84 99 95 f7 31 ed 89 e8 5b 41 5e 5d c3 66 2e 0f 1f 84 00 00 00 00 00 90 <53> 48 89 fb bf 01 00 00 00 e8 a2 97 9e f7 48 8d 7b 18 31 f6 31 d2
RSP: 0018:ffffc90002e9fea8 EFLAGS: 00000293
RAX: ffffffff81ce235f RBX: ffff88802a961740 RCX: ffff88801a5a8000
RDX: 0000000000000000 RSI: 0000000000000009 RDI: ffff88802a961740
RBP: 0000000000000009 R08: dffffc0000000000 R09: fffffbfff1ad33a6
R10: fffffbfff1ad33a6 R11: 1ffffffff1ad33a5 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff88802a961680 R15: 0000000000000003
spin_lock include/linux/spinlock.h:364 [inline]
pick_file+0x2e/0x220 fs/file.c:623
close_fd+0x45/0x80 fs/file.c:648
__do_sys_close fs/open.c:1382 [inline]
__se_sys_close fs/open.c:1380 [inline]
__x64_sys_close+0x34/0x70 fs/open.c:1380
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fdacdd8aa67
Code: 44 00 00 48 83 ec 10 48 63 ff 45 31 c9 45 31 c0 6a 01 31 c9 e8 ca 19 f9 ff 48 83 c4 18 c3 0f 1f 44 00 00 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 61 b3 0d 00 f7 d8 64 89 02 b8
RSP: 002b:00007ffe88924cb8 EFLAGS: 00000297 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 000055e45bf39280 RCX: 00007fdacdd8aa67
RDX: 00007fdacde64ea0 RSI: 000055e45bf655c0 RDI: 0000000000000009
RBP: 00007fdacde64ff0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000297 R12: 0000000000000000
R13: 3d45505954564544 R14: 3d5845444e494649 R15: 3d454d414e564544
</TASK>
task:udevd state:R running task stack:23264 pid: 3561 ppid: 1 flags:0x00004002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11bb/0x4390 kernel/sched/core.c:6395
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:6571
preempt_schedule+0xa7/0xb0 kernel/sched/core.c:6596
preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
_raw_spin_unlock_irqrestore+0xf6/0x100 kernel/locking/spinlock.c:194
spin_unlock_irqrestore include/linux/spinlock.h:419 [inline]
__wake_up_common_lock kernel/sched/wait.c:140 [inline]
__wake_up_sync_key+0x11b/0x180 kernel/sched/wait.c:205
sock_def_readable+0x136/0x250 net/core/sock.c:3098
__netlink_sendskb net/netlink/af_netlink.c:1264 [inline]
netlink_sendskb+0x97/0x130 net/netlink/af_netlink.c:1270
netlink_sendmsg+0x8ab/0xbc0 net/netlink/af_netlink.c:1918
sock_sendmsg_nosec net/socket.c:706 [inline]
__sock_sendmsg net/socket.c:718 [inline]
____sys_sendmsg+0x5a2/0x8c0 net/socket.c:2446
___sys_sendmsg+0x1f0/0x260 net/socket.c:2500
__sys_sendmsg net/socket.c:2529 [inline]
__do_sys_sendmsg net/socket.c:2538 [inline]
__se_sys_sendmsg+0x190/0x250 net/socket.c:2536
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fdacdd1c407
RSP: 002b:00007ffe8892d760 EFLAGS: 00000202 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fdacdc2e880 RCX: 00007fdacdd1c407
RDX: 0000000000000000 RSI: 00007ffe8892d7c0 RDI: 0000000000000004
RBP: 000055e45bf559e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00000000000000b4
R13: 000055e45bf319e0 R14: 0000000000000000 R15: 0000000000000000
</TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g27965 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=12261
rcu: rcu_preempt kthread starved for 10502 jiffies! g27965 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:28064 pid: 15 ppid: 2 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11bb/0x4390 kernel/sched/core.c:6395
schedule+0x11b/0x1e0 kernel/sched/core.c:6478
schedule_timeout+0x15c/0x280 kernel/time/timer.c:1914
rcu_gp_fqs_loop+0x29e/0x11b0 kernel/rcu/tree.c:1972
rcu_gp_kthread+0x98/0x350 kernel/rcu/tree.c:2145
kthread+0x436/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
</TASK>
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: 4188 Comm: udevd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:mark_lock+0x1/0x320 kernel/locking/lockdep.c:4552
Code: c1 7c 90 48 c7 c7 c8 d0 69 8d e8 aa 83 5f 00 4c 89 f7 41 89 d9 e9 79 ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 <41> 57 41 56 41 55 41 54 53 50 89 d5 49 89 f6 48 89 fb 49 bd 00 00
RSP: 0018:ffffc900000078d0 EFLAGS: 00000006
RAX: 00000000000c405d RBX: ffff88801a5a8ae8 RCX: ffffffff815cb124
RDX: 0000000000000008 RSI: ffff88801a5a8af0 RDI: ffff88801a5a8000
RBP: ffffc90000007b30 R08: dffffc0000000000 R09: fffffbfff1ff7c1a
R10: fffffbfff1ff7c1a R11: 1ffffffff1ff7c19 R12: ffff88801a5a8b10
R13: ffff88801a5a8000 R14: 0000000000000000 R15: ffff88801a5a8af0
FS: 00007fdacdc2e880(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3261bff8 CR3: 0000000062513000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
mark_usage kernel/locking/lockdep.c:4512 [inline]
__lock_acquire+0xd5a/0x7c60 kernel/locking/lockdep.c:4966
lock_acquire+0x197/0x3f0 kernel/locking/lockdep.c:5623
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline]
_raw_spin_lock_irq+0x9f/0xe0 kernel/locking/spinlock.c:170
__run_hrtimer kernel/time/hrtimer.c:1689 [inline]
__hrtimer_run_queues+0x5ff/0xc40 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
__sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1108
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:_raw_spin_lock+0x0/0x40 kernel/locking/spinlock.c:153
Code: 21 a9 f7 48 83 c4 08 eb 0f 48 89 df be 01 02 00 00 e8 84 99 95 f7 31 ed 89 e8 5b 41 5e 5d c3 66 2e 0f 1f 84 00 00 00 00 00 90 <53> 48 89 fb bf 01 00 00 00 e8 a2 97 9e f7 48 8d 7b 18 31 f6 31 d2
RSP: 0018:ffffc90002e9fea8 EFLAGS: 00000293
RAX: ffffffff81ce235f RBX: ffff88802a961740 RCX: ffff88801a5a8000
RDX: 0000000000000000 RSI: 0000000000000009 RDI: ffff88802a961740
RBP: 0000000000000009 R08: dffffc0000000000 R09: fffffbfff1ad33a6
R10: fffffbfff1ad33a6 R11: 1ffffffff1ad33a5 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff88802a961680 R15: 0000000000000003
spin_lock include/linux/spinlock.h:364 [inline]
pick_file+0x2e/0x220 fs/file.c:623
close_fd+0x45/0x80 fs/file.c:648
__do_sys_close fs/open.c:1382 [inline]
__se_sys_close fs/open.c:1380 [inline]
__x64_sys_close+0x34/0x70 fs/open.c:1380
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fdacdd8aa67
Code: 44 00 00 48 83 ec 10 48 63 ff 45 31 c9 45 31 c0 6a 01 31 c9 e8 ca 19 f9 ff 48 83 c4 18 c3 0f 1f 44 00 00 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 61 b3 0d 00 f7 d8 64 89 02 b8
RSP: 002b:00007ffe88924cb8 EFLAGS: 00000297 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 000055e45bf39280 RCX: 00007fdacdd8aa67
RDX: 00007fdacde64ea0 RSI: 000055e45bf655c0 RDI: 0000000000000009
RBP: 00007fdacde64ff0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000297 R12: 0000000000000000
R13: 3d45505954564544 R14: 3d5845444e494649 R15: 3d454d414e564544
</TASK>
---
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(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
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If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: cc5ec8769306 Linux 5.15.196
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=124ba692580000
kernel config: https://syzkaller.appspot.com/x/.config?x=e1bb6d24ef2164eb
dashboard link: https://syzkaller.appspot.com/bug?extid=98e454ff02bc9b001cbc
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/c71c660545b2/disk-cc5ec876.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/4f011826cca6/vmlinux-cc5ec876.xz
kernel image: https://storage.googleapis.com/syzbot-assets/8ccd1a2c3f8c/bzImage-cc5ec876.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+98e454...@syzkaller.appspotmail.com
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-...!: (0 ticks this GP) idle=50d/1/0x4000000000000000 softirq=21175/21175 fqs=0
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P3561/1:b..l
(detected by 1, t=10502 jiffies, g=27965, q=1826)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4188 Comm: udevd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:mark_lock+0xa/0x320 kernel/locking/lockdep.c:4552
Code: 8d e8 aa 83 5f 00 4c 89 f7 41 89 d9 e9 79 ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 41 57 41 56 41 55 41 54 53 <50> 89 d5 49 89 f6 48 89 fb 49 bd 00 00 00 00 00 fc ff df 83 fa 08
RSP: 0018:ffffc90000007828 EFLAGS: 00000006
RAX: 00000000000c4000 RBX: 0000000000000001 RCX: ffffffff815cb124
RDX: 0000000000000008 RSI: ffff88801a5a8b18 RDI: ffff88801a5a8000
RBP: ffffc90000007ab0 R08: dffffc0000000000 R09: fffffbfff1ff7c19
R10: fffffbfff1ff7c19 R11: 1ffffffff1ff7c18 R12: ffff88801a5a8b38
R13: ffff88801a5a8000 R14: ffffffff8f94a5f8 R15: ffff88801a5a8b18
FS: 00007fdacdc2e880(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3261bff8 CR3: 0000000062513000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
mark_usage kernel/locking/lockdep.c:4512 [inline]
__lock_acquire+0xd5a/0x7c60 kernel/locking/lockdep.c:4966
lock_acquire+0x197/0x3f0 kernel/locking/lockdep.c:5623
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xa4/0xf0 kernel/locking/spinlock.c:162
debug_object_deactivate+0x63/0x340 lib/debugobjects.c:749
debug_hrtimer_deactivate kernel/time/hrtimer.c:415 [inline]
debug_deactivate+0x1d/0x1c0 kernel/time/hrtimer.c:471
__run_hrtimer kernel/time/hrtimer.c:1653 [inline]
__hrtimer_run_queues+0x2db/0xc40 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
__sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1108
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:_raw_spin_lock+0x0/0x40 kernel/locking/spinlock.c:153
Code: 21 a9 f7 48 83 c4 08 eb 0f 48 89 df be 01 02 00 00 e8 84 99 95 f7 31 ed 89 e8 5b 41 5e 5d c3 66 2e 0f 1f 84 00 00 00 00 00 90 <53> 48 89 fb bf 01 00 00 00 e8 a2 97 9e f7 48 8d 7b 18 31 f6 31 d2
RSP: 0018:ffffc90002e9fea8 EFLAGS: 00000293
RAX: ffffffff81ce235f RBX: ffff88802a961740 RCX: ffff88801a5a8000
RDX: 0000000000000000 RSI: 0000000000000009 RDI: ffff88802a961740
RBP: 0000000000000009 R08: dffffc0000000000 R09: fffffbfff1ad33a6
R10: fffffbfff1ad33a6 R11: 1ffffffff1ad33a5 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff88802a961680 R15: 0000000000000003
spin_lock include/linux/spinlock.h:364 [inline]
pick_file+0x2e/0x220 fs/file.c:623
close_fd+0x45/0x80 fs/file.c:648
__do_sys_close fs/open.c:1382 [inline]
__se_sys_close fs/open.c:1380 [inline]
__x64_sys_close+0x34/0x70 fs/open.c:1380
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fdacdd8aa67
Code: 44 00 00 48 83 ec 10 48 63 ff 45 31 c9 45 31 c0 6a 01 31 c9 e8 ca 19 f9 ff 48 83 c4 18 c3 0f 1f 44 00 00 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 61 b3 0d 00 f7 d8 64 89 02 b8
RSP: 002b:00007ffe88924cb8 EFLAGS: 00000297 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 000055e45bf39280 RCX: 00007fdacdd8aa67
RDX: 00007fdacde64ea0 RSI: 000055e45bf655c0 RDI: 0000000000000009
RBP: 00007fdacde64ff0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000297 R12: 0000000000000000
R13: 3d45505954564544 R14: 3d5845444e494649 R15: 3d454d414e564544
</TASK>
task:udevd state:R running task stack:23264 pid: 3561 ppid: 1 flags:0x00004002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11bb/0x4390 kernel/sched/core.c:6395
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:6571
preempt_schedule+0xa7/0xb0 kernel/sched/core.c:6596
preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
_raw_spin_unlock_irqrestore+0xf6/0x100 kernel/locking/spinlock.c:194
spin_unlock_irqrestore include/linux/spinlock.h:419 [inline]
__wake_up_common_lock kernel/sched/wait.c:140 [inline]
__wake_up_sync_key+0x11b/0x180 kernel/sched/wait.c:205
sock_def_readable+0x136/0x250 net/core/sock.c:3098
__netlink_sendskb net/netlink/af_netlink.c:1264 [inline]
netlink_sendskb+0x97/0x130 net/netlink/af_netlink.c:1270
netlink_sendmsg+0x8ab/0xbc0 net/netlink/af_netlink.c:1918
sock_sendmsg_nosec net/socket.c:706 [inline]
__sock_sendmsg net/socket.c:718 [inline]
____sys_sendmsg+0x5a2/0x8c0 net/socket.c:2446
___sys_sendmsg+0x1f0/0x260 net/socket.c:2500
__sys_sendmsg net/socket.c:2529 [inline]
__do_sys_sendmsg net/socket.c:2538 [inline]
__se_sys_sendmsg+0x190/0x250 net/socket.c:2536
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fdacdd1c407
RSP: 002b:00007ffe8892d760 EFLAGS: 00000202 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fdacdc2e880 RCX: 00007fdacdd1c407
RDX: 0000000000000000 RSI: 00007ffe8892d7c0 RDI: 0000000000000004
RBP: 000055e45bf559e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00000000000000b4
R13: 000055e45bf319e0 R14: 0000000000000000 R15: 0000000000000000
</TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g27965 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=12261
rcu: rcu_preempt kthread starved for 10502 jiffies! g27965 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:28064 pid: 15 ppid: 2 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11bb/0x4390 kernel/sched/core.c:6395
schedule+0x11b/0x1e0 kernel/sched/core.c:6478
schedule_timeout+0x15c/0x280 kernel/time/timer.c:1914
rcu_gp_fqs_loop+0x29e/0x11b0 kernel/rcu/tree.c:1972
rcu_gp_kthread+0x98/0x350 kernel/rcu/tree.c:2145
kthread+0x436/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
</TASK>
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: 4188 Comm: udevd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:mark_lock+0x1/0x320 kernel/locking/lockdep.c:4552
Code: c1 7c 90 48 c7 c7 c8 d0 69 8d e8 aa 83 5f 00 4c 89 f7 41 89 d9 e9 79 ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 <41> 57 41 56 41 55 41 54 53 50 89 d5 49 89 f6 48 89 fb 49 bd 00 00
RSP: 0018:ffffc900000078d0 EFLAGS: 00000006
RAX: 00000000000c405d RBX: ffff88801a5a8ae8 RCX: ffffffff815cb124
RDX: 0000000000000008 RSI: ffff88801a5a8af0 RDI: ffff88801a5a8000
RBP: ffffc90000007b30 R08: dffffc0000000000 R09: fffffbfff1ff7c1a
R10: fffffbfff1ff7c1a R11: 1ffffffff1ff7c19 R12: ffff88801a5a8b10
R13: ffff88801a5a8000 R14: 0000000000000000 R15: ffff88801a5a8af0
FS: 00007fdacdc2e880(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3261bff8 CR3: 0000000062513000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
mark_usage kernel/locking/lockdep.c:4512 [inline]
__lock_acquire+0xd5a/0x7c60 kernel/locking/lockdep.c:4966
lock_acquire+0x197/0x3f0 kernel/locking/lockdep.c:5623
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline]
_raw_spin_lock_irq+0x9f/0xe0 kernel/locking/spinlock.c:170
__run_hrtimer kernel/time/hrtimer.c:1689 [inline]
__hrtimer_run_queues+0x5ff/0xc40 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
__sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1108
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:_raw_spin_lock+0x0/0x40 kernel/locking/spinlock.c:153
Code: 21 a9 f7 48 83 c4 08 eb 0f 48 89 df be 01 02 00 00 e8 84 99 95 f7 31 ed 89 e8 5b 41 5e 5d c3 66 2e 0f 1f 84 00 00 00 00 00 90 <53> 48 89 fb bf 01 00 00 00 e8 a2 97 9e f7 48 8d 7b 18 31 f6 31 d2
RSP: 0018:ffffc90002e9fea8 EFLAGS: 00000293
RAX: ffffffff81ce235f RBX: ffff88802a961740 RCX: ffff88801a5a8000
RDX: 0000000000000000 RSI: 0000000000000009 RDI: ffff88802a961740
RBP: 0000000000000009 R08: dffffc0000000000 R09: fffffbfff1ad33a6
R10: fffffbfff1ad33a6 R11: 1ffffffff1ad33a5 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff88802a961680 R15: 0000000000000003
spin_lock include/linux/spinlock.h:364 [inline]
pick_file+0x2e/0x220 fs/file.c:623
close_fd+0x45/0x80 fs/file.c:648
__do_sys_close fs/open.c:1382 [inline]
__se_sys_close fs/open.c:1380 [inline]
__x64_sys_close+0x34/0x70 fs/open.c:1380
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fdacdd8aa67
Code: 44 00 00 48 83 ec 10 48 63 ff 45 31 c9 45 31 c0 6a 01 31 c9 e8 ca 19 f9 ff 48 83 c4 18 c3 0f 1f 44 00 00 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 61 b3 0d 00 f7 d8 64 89 02 b8
RSP: 002b:00007ffe88924cb8 EFLAGS: 00000297 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 000055e45bf39280 RCX: 00007fdacdd8aa67
RDX: 00007fdacde64ea0 RSI: 000055e45bf655c0 RDI: 0000000000000009
RBP: 00007fdacde64ff0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000297 R12: 0000000000000000
R13: 3d45505954564544 R14: 3d5845444e494649 R15: 3d454d414e564544
</TASK>
---
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