rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-...!: (0 ticks this GP) idle=3f1c/1/0x4000000000000000 softirq=37844/37844 fqs=0
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P8904/1:b..l
rcu: (detected by 1, t=10505 jiffies, g=42609, q=211 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 9647 Comm: syz.8.760 Not tainted 6.14.0-rc3-next-20250218-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:26 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:87 [inline]
RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:147 [inline]
RIP: 0010:__raw_spin_lock_irq include/linux/spinlock_api_smp.h:117 [inline]
RIP: 0010:_raw_spin_lock_irq+0x89/0x120 kernel/locking/spinlock.c:170
Code: f1 00 f3 f3 f3 4b 89 44 3d 00 4c 89 f3 48 c1 eb 03 42 80 3c 3b 00 74 08 4c 89 f7 e8 c1 4d 19 f6 48 c7 44 24 20 00 00 00 00 9c <8f> 44 24 20 42 80 3c 3b 00 74 08 4c 89 f7 e8 b4 4c 19 f6 8b 44 24
RSP: 0018:ffffc90000007c98 EFLAGS: 00000046
RAX: f3f3f300f1f1f1f1 RBX: 1ffff92000000f98 RCX: ffff88805d470000
RDX: 0000000000010000 RSI: ffffffff8c8156c0 RDI: ffff8880b862c500
RBP: ffffc90000007d30 R08: ffffffff81af5a26 R09: 1ffffffff207b48e
R10: dffffc0000000000 R11: fffffbfff207b48f R12: ffff8880b862c500
R13: 1ffff92000000f94 R14: ffffc90000007cc0 R15: dffffc0000000000
FS: 00007f15dcbc06c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f15dcbbff98 CR3: 0000000068616000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__run_hrtimer kernel/time/hrtimer.c:1805 [inline]
__hrtimer_run_queues+0x670/0xd30 kernel/time/hrtimer.c:1865
hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1927
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
__sysvec_apic_timer_interrupt+0x110/0x420 arch/x86/kernel/apic/apic.c:1055
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
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 9e 4a 19 f6 f6 44 24 21 02 75 52 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 a3 83 7f f5 65 8b 05 84 a0 f3 73 85 c0 74 43 48 c7 04 24 0e 36
RSP: 0018:ffffc9000d0d7ba0 EFLAGS: 00000206
RAX: 100aecbb5e48ba00 RBX: 1ffff92001a1af78 RCX: ffffffff819d865a
RDX: dffffc0000000000 RSI: ffffffff8c2a9d00 RDI: 0000000000000001
RBP: ffffc9000d0d7c30 R08: ffffffff9456b007 R09: 1ffffffff28ad600
R10: dffffc0000000000 R11: fffffbfff28ad601 R12: dffffc0000000000
R13: 1ffff92001a1af74 R14: ffffc9000d0d7bc0 R15: 0000000000000246
clock_was_set+0x686/0x810 kernel/time/hrtimer.c:984
do_settimeofday64+0x343/0x5e0 kernel/time/timekeeping.c:1381
__do_sys_clock_settime kernel/time/posix-timers.c:1135 [inline]
__se_sys_clock_settime kernel/time/posix-timers.c:1119 [inline]
__x64_sys_clock_settime+0x23a/0x280 kernel/time/posix-timers.c:1119
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f15dbd8d169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f15dcbc0038 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3
RAX: ffffffffffffffda RBX: 00007f15dbfa6080 RCX: 00007f15dbd8d169
RDX: 0000000000000000 RSI: 0000400000000240 RDI: 0000000000000000
RBP: 00007f15dbe0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f15dbfa6080 R15: 00007ffe6dd12188
task:kworker/u8:18 state:R running task stack:20096 pid:8904 tgid:8904 ppid:2 task_flags:0x4208060 flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
context_switch kernel/sched/core.c:5373 [inline]
__schedule+0x190e/0x4c90 kernel/sched/core.c:6760
preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7082
irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:lock_acquire+0x264/0x550 kernel/locking/lockdep.c:5855
Code: 2b 00 74 08 4c 89 f7 e8 3a 71 8c 00 f6 44 24 61 02 0f 85 85 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25
RSP: 0018:ffffc90004ba7940 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff92000974f34 RCX: ffff888025b00ae8
RDX: dffffc0000000000 RSI: ffffffff8c2aaf60 RDI: ffffffff8c8156e0
RBP: ffffc90004ba7aa0 R08: ffffffff9456b007 R09: 1ffffffff28ad600
R10: dffffc0000000000 R11: fffffbfff28ad601 R12: 1ffff92000974f30
R13: dffffc0000000000 R14: ffffc90004ba79a0 R15: 0000000000000246
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:841 [inline]
batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline]
batadv_nc_worker+0xec/0x610 net/batman-adv/network-coding.c:719
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xabe/0x18e0 kernel/workqueue.c:3319
worker_thread+0x870/0xd30 kernel/workqueue.c:3400
kthread+0x7a9/0x920 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: rcu_preempt kthread timer wakeup didn't happen for 10504 jiffies! g42609 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=32462
rcu: rcu_preempt kthread starved for 10505 jiffies! g42609 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:24944 pid:15 tgid:15 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5373 [inline]
__schedule+0x190e/0x4c90 kernel/sched/core.c:6760
__schedule_loop kernel/sched/core.c:6837 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6852
schedule_timeout+0x15a/0x290 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2044
rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2246
kthread+0x7a9/0x920 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245