rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (2 ticks this GP) idle=e5fc/1/0x4000000000000000 softirq=51106/51108 fqs=42
rcu: (detected by 0, t=10506 jiffies, g=69589, q=535 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 15790 Comm: syz-executor.0 Not tainted 6.6.0-rc2-syzkaller-00244-g27bbf45eae9c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:173 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x10/0x60 kernel/kcov.c:207
Code: 89 fb e8 13 00 00 00 48 8b 3d 24 61 0c 0d 48 89 de 5b e9 b3 93 59 00 0f 1f 00 f3 0f 1e fa 48 8b 04 24 65 48 8b 0d f0 ae 75 7e <65> 8b 15 f1 ae 75 7e f7 c2 00 01 ff 00 74 11 f7 c2 00 01 00 00 74
RSP: 0018:ffffc900001f0d58 EFLAGS: 00000002
RAX: ffffffff817d285d RBX: 0000000000000001 RCX: ffff8880147c0000
RDX: ffff8880147c0000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900001f0ea8 R08: ffffffff817d2850 R09: 0000000000000000
R10: ffff8880347d7340 R11: ffffed10068fae6b R12: ffff8880b992b840
R13: ffff8880b992ba40 R14: ffff8880347d7340 R15: dffffc0000000000
FS: 00007f614c66a6c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f614b998000 CR3: 0000000032f89000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__run_hrtimer kernel/time/hrtimer.c:1654 [inline]
__hrtimer_run_queues+0x30d/0xd10 kernel/time/hrtimer.c:1752
hrtimer_interrupt+0x396/0x980 kernel/time/hrtimer.c:1814
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1063 [inline]
__sysvec_apic_timer_interrupt+0x104/0x390 arch/x86/kernel/apic/apic.c:1080
sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1074
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xd8/0x140 kernel/locking/spinlock.c:194
Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 7e f3 10 f7 f6 44 24 21 02 75 4e 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 03 e9 88 f6 65 8b 05 c4 32 2c 75 85 c0 74 3f 48 c7 04 24 0e 36
RSP: 0018:ffffc9000ce6fb40 EFLAGS: 00000206
RAX: d9ed874ff711b600 RBX: 1ffff920019cdf6c RCX: ffffffff816dbf3a
RDX: dffffc0000000000 RSI: ffffffff8b0aa4a0 RDI: 0000000000000001
RBP: ffffc9000ce6fbd0 R08: ffffffff906f9387 R09: 1ffffffff20df270
R10: dffffc0000000000 R11: fffffbfff20df271 R12: dffffc0000000000
R13: 1ffff920019cdf68 R14: ffffc9000ce6fb60 R15: 0000000000000246
clock_was_set+0x6a1/0x830 kernel/time/hrtimer.c:972
do_settimeofday64+0x677/0x7e0 kernel/time/timekeeping.c:1345
__do_sys_clock_settime kernel/time/posix-timers.c:1129 [inline]
__se_sys_clock_settime kernel/time/posix-timers.c:1113 [inline]
__x64_sys_clock_settime+0x236/0x270 kernel/time/posix-timers.c:1113
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f614b87cae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f614c66a0c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3
RAX: ffffffffffffffda RBX: 00007f614b99bf80 RCX: 00007f614b87cae9
RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000000
RBP: 00007f614b8c847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f614b99bf80 R15: 00007ffecc84d028
rcu: rcu_preempt kthread starved for 10295 jiffies! g69589 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:26504 pid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x196c/0x4af0 kernel/sched/core.c:6695
schedule+0xc3/0x180 kernel/sched/core.c:6771
schedule_timeout+0x1bd/0x300 kernel/time/timer.c:2167
rcu_gp_fqs_loop+0x2c6/0x1010 kernel/rcu/tree.c:1613
rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:1812
kthread+0x2d3/0x370 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 5128 Comm: kworker/0:7 Not tainted 6.6.0-rc2-syzkaller-00244-g27bbf45eae9c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
Workqueue: events fqdir_free_fn
RIP: 0010:csd_lock_wait kernel/smp.c:300 [inline]
RIP: 0010:smp_call_function_single+0x459/0x1610 kernel/smp.c:639
Code: 0d 91 0b 00 41 83 e4 01 75 16 e8 52 8d 0b 00 4d 89 fc 44 8b 7c 24 14 eb 46 e8 43 8d 0b 00 eb 3f 4d 89 fc 44 8b 7c 24 14 f3 90 <42> 0f b6 04 2b 84 c0 75 10 41 f7 06 01 00 00 00 74 1e e8 20 8d 0b
RSP: 0018:ffffc900049279c0 EFLAGS: 00000293
RAX: ffffffff81827ca0 RBX: 1ffff92000924f51 RCX: ffff8880218a1dc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90004927b30 R08: ffffffff81827c63 R09: 1ffff92000924f04
R10: dffffc0000000000 R11: fffff52000924f05 R12: 1ffff92000924f4c
R13: dffffc0000000000 R14: ffffc90004927a88 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd2af398000 CR3: 000000002e7cd000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
rcu_barrier+0x32e/0x540 kernel/rcu/tree.c:4053
fqdir_free_fn+0x32/0x130 net/ipv4/inet_fragment.c:164
process_one_work kernel/workqueue.c:2630 [inline]
process_scheduled_works+0x90f/0x1400 kernel/workqueue.c:2703
worker_thread+0xa5f/0xff0 kernel/workqueue.c:2784
kthread+0x2d3/0x370 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304