rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 0-...!: (1 GPs behind) idle=2b3/1/0x4000000000000000 softirq=22220/22221 fqs=12
(t=10500 jiffies g=29961 q=311)
rcu: rcu_preempt kthread starved for 10470 jiffies! g29961 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
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:26576 pid: 14 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:4969 [inline]
__schedule+0xb72/0x1460 kernel/sched/core.c:6250
schedule+0x12b/0x1f0 kernel/sched/core.c:6323
schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1881
rcu_gp_fqs_loop+0x1fd/0x770 kernel/rcu/tree.c:1955
rcu_gp_kthread+0xa5/0x350 kernel/rcu/tree.c:2128
kthread+0x468/0x490 kernel/kthread.c:327
ret_from_fork+0x1f/0x30
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 14091 Comm: syz-executor.4 Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:29 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline]
RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:106 [inline]
RIP: 0010:lock_is_held_type+0x63/0x190 kernel/locking/lockdep.c:5664
Code: fd 00 00 00 65 4c 8b 2c 25 c0 ef 01 00 41 83 bd 5c 0a 00 00 00 0f 85 e6 00 00 00 41 89 f6 49 89 ff 48 c7 04 24 00 00 00 00 9c <8f> 04 24 4c 8b 24 24 fa 48 c7 c7 80 09 4f 8a e8 79 11 00 00 65 ff
RSP: 0018:ffffc90000dc0730 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 00000000ffffffff RCX: 0000000000010002
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffffffff8c91d460
RBP: ffffc90000dc0808 R08: dffffc0000000000 R09: fffffbfff1bb8fc6
R10: fffffbfff1bb8fc6 R11: 0000000000000000 R12: 0000000000000002
R13: ffff88807b9e5700 R14: 00000000ffffffff R15: ffffffff8c91d460
FS: 00007f11dd479700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30122000 CR3: 000000007be00000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lock_is_held include/linux/lockdep.h:283 [inline]
rcu_read_lock_sched_held+0x89/0x130 kernel/rcu/update.c:125
trace_lock_acquire+0x59/0x190 include/trace/events/lock.h:13
lock_acquire+0xa5/0x4d0 kernel/locking/lockdep.c:5596
seqcount_lockdep_reader_access+0xfe/0x230 include/linux/seqlock.h:103
ktime_get+0x35/0x2b0 kernel/time/timekeeping.c:827
hrtimer_forward_now include/linux/hrtimer.h:506 [inline]
perf_swevent_hrtimer+0x485/0x530 kernel/events/core.c:10602
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x4cb/0xa60 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x3b3/0x1040 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
__sysvec_apic_timer_interrupt+0xf9/0x270 arch/x86/kernel/apic/apic.c:1103
sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xd4/0x130 kernel/locking/spinlock.c:194
Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 02 5a d1 f7 f6 44 24 21 02 75 4e 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 47 e2 5b f7 65 8b 05 d8 2b 04 76 85 c0 74 3f 48 c7 04 24 0e 36
RSP: 0018:ffffc900048e6f60 EFLAGS: 00000206
RAX: 2b4f8a36c1523b00 RBX: 1ffff9200091cdf0 RCX: ffffffff8165ef81
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffc900048e6ff0 R08: dffffc0000000000 R09: fffffbfff1fa65f0
R10: fffffbfff1fa65f0 R11: 0000000000000000 R12: dffffc0000000000
R13: 1ffff9200091cdec R14: ffffc900048e6f80 R15: 0000000000000246
spin_unlock_irqrestore include/linux/spinlock.h:405 [inline]
klist_next+0x29a/0x330 lib/klist.c:401
class_dev_iter_next+0x39/0xd0 drivers/base/class.c:311
disk_seqf_start block/genhd.c:762 [inline]
show_partition_start+0xc8/0x180 block/genhd.c:798
seq_read_iter+0x401/0xdc0 fs/seq_file.c:225
proc_reg_read_iter+0x19c/0x260 fs/proc/inode.c:300
call_read_iter include/linux/fs.h:2155 [inline]
io_iter_do_read fs/io_uring.c:3462 [inline]
io_read fs/io_uring.c:3519 [inline]
io_issue_sqe+0x1449/0x9830 fs/io_uring.c:6628
__io_queue_sqe+0x2d/0x7b0 fs/io_uring.c:6978
io_queue_sqe fs/io_uring.c:7020 [inline]
io_submit_sqe fs/io_uring.c:7223 [inline]
io_submit_sqes+0xffc/0xa7c0 fs/io_uring.c:7329
__do_sys_io_uring_enter fs/io_uring.c:10043 [inline]
__se_sys_io_uring_enter+0x21f/0x1cb0 fs/io_uring.c:9985
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f11dff03ae9
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f11dd479188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: ffffffffffffffda RBX: 00007f11e0016f60 RCX: 00007f11dff03ae9
RDX: 0000000000000000 RSI: 0000000000004000 RDI: 0000000000000003
RBP: 00007f11dff5df25 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffa961fcff R14: 00007f11dd479300 R15: 0000000000022000
NMI backtrace for cpu 0
CPU: 0 PID: 14080 Comm: syz-executor.0 Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1dc/0x2d8 lib/dump_stack.c:106
nmi_cpu_backtrace+0x45f/0x490 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_dump_cpu_stacks+0x22d/0x390 kernel/rcu/tree_stall.h:343
print_cpu_stall kernel/rcu/tree_stall.h:627 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:711 [inline]
rcu_pending kernel/rcu/tree.c:3878 [inline]
rcu_sched_clock_irq+0x1e33/0x2bc0 kernel/rcu/tree.c:2597
update_process_times+0x197/0x200 kernel/time/timer.c:1785
tick_sched_handle kernel/time/tick-sched.c:226 [inline]
tick_sched_timer+0x27d/0x420 kernel/time/tick-sched.c:1421
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x4cb/0xa60 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x3b3/0x1040 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
__sysvec_apic_timer_interrupt+0xf9/0x270 arch/x86/kernel/apic/apic.c:1103
sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xd4/0x130 kernel/locking/spinlock.c:194
Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 02 5a d1 f7 f6 44 24 21 02 75 4e 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 47 e2 5b f7 65 8b 05 d8 2b 04 76 85 c0 74 3f 48 c7 04 24 0e 36
RSP: 0018:ffffc90004866f60 EFLAGS: 00000206
RAX: 4f17ab1610480300 RBX: 1ffff9200090cdf0 RCX: ffffffff8165ef81
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffc90004866ff0 R08: dffffc0000000000 R09: fffffbfff1fa65f0
R10: fffffbfff1fa65f0 R11: 0000000000000000 R12: dffffc0000000000
R13: 1ffff9200090cdec R14: ffffc90004866f80 R15: 0000000000000246
spin_unlock_irqrestore include/linux/spinlock.h:405 [inline]
klist_next+0x29a/0x330 lib/klist.c:401
class_dev_iter_next+0x39/0xd0 drivers/base/class.c:311
disk_seqf_start block/genhd.c:762 [inline]
show_partition_start+0xc8/0x180 block/genhd.c:798
seq_read_iter+0x401/0xdc0 fs/seq_file.c:225
proc_reg_read_iter+0x19c/0x260 fs/proc/inode.c:300
call_read_iter include/linux/fs.h:2155 [inline]
io_iter_do_read fs/io_uring.c:3462 [inline]
io_read fs/io_uring.c:3519 [inline]
io_issue_sqe+0x1449/0x9830 fs/io_uring.c:6628
__io_queue_sqe+0x2d/0x7b0 fs/io_uring.c:6978
io_queue_sqe fs/io_uring.c:7020 [inline]
io_submit_sqe fs/io_uring.c:7223 [inline]
io_submit_sqes+0xffc/0xa7c0 fs/io_uring.c:7329
__do_sys_io_uring_enter fs/io_uring.c:10043 [inline]
__se_sys_io_uring_enter+0x21f/0x1cb0 fs/io_uring.c:9985
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fe4e2b79ae9
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe4e00ef188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: ffffffffffffffda RBX: 00007fe4e2c8cf60 RCX: 00007fe4e2b79ae9
RDX: 0000000000000000 RSI: 0000000000004000 RDI: 0000000000000003
RBP: 00007fe4e2bd3f25 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff89efe77f R14: 00007fe4e00ef300 R15: 0000000000022000
----------------
Code disassembly (best guess):
0: fd std
1: 00 00 add %al,(%rax)
3: 00 65 4c add %ah,0x4c(%rbp)
6: 8b 2c 25 c0 ef 01 00 mov 0x1efc0,%ebp
d: 41 83 bd 5c 0a 00 00 cmpl $0x0,0xa5c(%r13)
14: 00
15: 0f 85 e6 00 00 00 jne 0x101
1b: 41 89 f6 mov %esi,%r14d
1e: 49 89 ff mov %rdi,%r15
21: 48 c7 04 24 00 00 00 movq $0x0,(%rsp)
28: 00
29: 9c pushfq
* 2a: 8f 04 24 popq (%rsp) <-- trapping instruction
2d: 4c 8b 24 24 mov (%rsp),%r12
31: fa cli
32: 48 c7 c7 80 09 4f 8a mov $0xffffffff8a4f0980,%rdi
39: e8 79 11 00 00 callq 0x11b7
3e: 65 gs
3f: ff .byte 0xff