rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (10727 ticks this GP) idle=efd/1/0x4000000000000000 softirq=111525/111530 fqs=0 (t=10500 jiffies g=174929 q=62) rcu: rcu_preempt kthread timer wakeup didn't happen for 10499 jiffies! g174929 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=1 timer-softirq=93100 rcu: rcu_preempt kthread starved for 10500 jiffies! g174929 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:26424 pid: 15 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5027 [inline] __schedule+0x12c4/0x45b0 kernel/sched/core.c:6373 schedule+0x11b/0x1f0 kernel/sched/core.c:6456 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1914 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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 19064 Comm: syz.4.3488 Not tainted 5.15.167-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:__lock_acquire+0x106/0x1ff0 kernel/locking/lockdep.c:4911 Code: 00 00 00 00 fc ff df 48 89 c3 48 85 c0 0f 84 58 14 00 00 49 8d ad e8 0a 00 00 48 89 e8 48 c1 e8 03 48 89 44 24 40 0f b6 04 10 <84> c0 0f 85 b7 15 00 00 48 89 6c 24 30 8b 6d 00 48 c7 c0 c0 8f 86 RSP: 0018:ffffc9000303f8c0 EFLAGS: 00000802 RAX: 0000000000000000 RBX: ffffffff900f1940 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff88806c43ef18 RBP: ffff888026cba8a8 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: ffffffff814f92fa R12: 0000000000000001 R13: ffff888026cb9dc0 R14: 0000000000000000 R15: 0000000000000001 FS: 00007fb13ec426c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb13ec42650 CR3: 000000007134f000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: reacquire_held_locks+0x3a2/0x660 kernel/locking/lockdep.c:5150 __lock_release kernel/locking/lockdep.c:5339 [inline] lock_release+0x369/0x9a0 kernel/locking/lockdep.c:5643 rcu_read_unlock include/linux/rcupdate.h:772 [inline] __lock_task_sighand+0x26a/0x290 kernel/signal.c:1409 lock_task_sighand include/linux/sched/signal.h:710 [inline] do_send_sig_info kernel/signal.c:1293 [inline] group_send_sig_info+0x23f/0x2d0 kernel/signal.c:1442 bpf_send_signal_common+0x2d8/0x420 kernel/trace/bpf_trace.c:824 ____bpf_send_signal kernel/trace/bpf_trace.c:829 [inline] bpf_send_signal+0x15/0x20 kernel/trace/bpf_trace.c:827 bpf_prog_7ba5217f62dcd359+0x38/0x584 bpf_dispatcher_nop_func include/linux/bpf.h:790 [inline] __bpf_prog_run include/linux/filter.h:628 [inline] bpf_prog_run include/linux/filter.h:635 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:1880 [inline] bpf_trace_run2+0x19e/0x340 kernel/trace/bpf_trace.c:1917 __bpf_trace_sys_enter+0x60/0x70 include/trace/events/syscalls.h:18 trace_sys_enter include/trace/events/syscalls.h:18 [inline] syscall_trace_enter kernel/entry/common.c:77 [inline] __syscall_enter_from_user_work kernel/entry/common.c:96 [inline] syscall_enter_from_user_mode+0x202/0x240 kernel/entry/common.c:114 do_syscall_64+0x1e/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fb140765869 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:00007fb13ec41b40 EFLAGS: 00000246 ORIG_RAX: 000000000000000f RAX: ffffffffffffffda RBX: 00007fb140981f88 RCX: 00007fb140765869 RDX: 00007fb13ec41b40 RSI: 00007fb13ec41c70 RDI: 0000000000000011 RBP: 00007fb140981f80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb140981f8c R13: 0000000000000000 R14: 00007ffe66347d60 R15: 00007ffe66347e48 NMI backtrace for cpu 0 CPU: 0 PID: 19065 Comm: syz.4.3488 Not tainted 5.15.167-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline] rcu_dump_cpu_stacks+0x223/0x390 kernel/rcu/tree_stall.h:349 print_cpu_stall+0x320/0x600 kernel/rcu/tree_stall.h:633 check_cpu_stall kernel/rcu/tree_stall.h:727 [inline] rcu_pending kernel/rcu/tree.c:3932 [inline] rcu_sched_clock_irq+0x8d9/0x1150 kernel/rcu/tree.c:2619 update_process_times+0x196/0x200 kernel/time/timer.c:1818 tick_sched_handle kernel/time/tick-sched.c:254 [inline] tick_sched_timer+0x386/0x550 kernel/time/tick-sched.c:1473 __run_hrtimer kernel/time/hrtimer.c:1688 [inline] __hrtimer_run_queues+0x55b/0xcf0 kernel/time/hrtimer.c:1752 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1814 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline] __sysvec_apic_timer_interrupt+0x139/0x470 arch/x86/kernel/apic/apic.c:1102 sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [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 f2 3e 8c f7 f6 44 24 21 02 75 4e 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 87 87 19 f7 65 8b 05 08 8a c4 75 85 c0 74 3f 48 c7 04 24 0e 36 RSP: 0018:ffffc90002f27ba0 EFLAGS: 00000206 RAX: d6b04cb400c75a00 RBX: 1ffff920005e4f78 RCX: ffffffff96868f03 RDX: dffffc0000000000 RSI: ffffffff8a8b2b00 RDI: 0000000000000001 RBP: ffffc90002f27c30 R08: ffffffff8186db50 R09: ffffed100d887de1 R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000 R13: 1ffff920005e4f74 R14: ffffc90002f27bc0 R15: 0000000000000246 spin_unlock_irqrestore include/linux/spinlock.h:418 [inline] unlock_task_sighand include/linux/sched/signal.h:718 [inline] do_send_sig_info kernel/signal.c:1295 [inline] group_send_sig_info+0x2ab/0x2d0 kernel/signal.c:1442 bpf_send_signal_common+0x2d8/0x420 kernel/trace/bpf_trace.c:824 ____bpf_send_signal kernel/trace/bpf_trace.c:829 [inline] bpf_send_signal+0x15/0x20 kernel/trace/bpf_trace.c:827 bpf_prog_7ba5217f62dcd359+0x38/0x584 bpf_dispatcher_nop_func include/linux/bpf.h:790 [inline] __bpf_prog_run include/linux/filter.h:628 [inline] bpf_prog_run include/linux/filter.h:635 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:1880 [inline] bpf_trace_run2+0x19e/0x340 kernel/trace/bpf_trace.c:1917 __bpf_trace_sys_enter+0x60/0x70 include/trace/events/syscalls.h:18 trace_sys_enter include/trace/events/syscalls.h:18 [inline] syscall_trace_enter kernel/entry/common.c:77 [inline] __syscall_enter_from_user_work kernel/entry/common.c:96 [inline] syscall_enter_from_user_mode+0x202/0x240 kernel/entry/common.c:114 do_syscall_64+0x1e/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fb140765869 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:00007fb13ec20b40 EFLAGS: 00000246 ORIG_RAX: 000000000000000f RAX: ffffffffffffffda RBX: 00007fb140982060 RCX: 00007fb140765869 RDX: 00007fb13ec20b40 RSI: 00007fb13ec20c70 RDI: 0000000000000011 RBP: 00007fb140982058 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb140982064 R13: 0000000000000000 R14: 00007ffe66347d60 R15: 00007ffe66347e48 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 19064 Comm: syz.4.3488 Not tainted 5.15.167-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline] RIP: 0010:write_comp_data kernel/kcov.c:227 [inline] RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x30/0x80 kernel/kcov.c:293 Code: 8b 15 e4 11 82 7e 65 8b 05 e5 11 82 7e 25 00 01 ff 00 74 10 3d 00 01 00 00 75 5b 83 ba 34 16 00 00 00 74 52 8b 82 10 16 00 00 <83> f8 03 75 47 48 8b 8a 18 16 00 00 44 8b 92 14 16 00 00 49 c1 e2 RSP: 0018:ffffc9000303fa50 EFLAGS: 00000046 RAX: 0000000000000002 RBX: 1ffff110068d25bb RCX: 0000000000040000 RDX: ffff888026cb9dc0 RSI: 000000000000000e RDI: 0000000000000011 RBP: ffff888034692dd8 R08: ffffffff81568a38 R09: fffff52000607fc6 R10: 0000000000000000 R11: dffffc0000000001 R12: ffffffff8c7dab40 R13: dffffc0000000000 R14: 000000000000000e R15: 000000000000000e FS: 00007fb13ec426c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb13ec42650 CR3: 000000007134f000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: dec_rlimit_put_ucounts+0x38/0x180 kernel/ucount.c:305 __sigqueue_free kernel/signal.c:455 [inline] collect_signal kernel/signal.c:597 [inline] __dequeue_signal+0x46f/0x5c0 kernel/signal.c:619 dequeue_signal+0x10c/0x520 kernel/signal.c:639 get_signal+0x52e/0x14e0 kernel/signal.c:2778 arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:154 [inline] exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:178 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x5d/0x240 kernel/entry/common.c:307 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fb1407c9ef9 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:00007fb13ec420e8 EFLAGS: 00000246 RAX: fffffffffffffffc RBX: 00007fb140981f88 RCX: 00007fb1407c9ef9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fb140981f88 RBP: 00007fb140981f80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb140981f8c R13: 0000000000000000 R14: 00007ffe66347d60 R15: 00007ffe66347e48