rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (44 ticks this GP) idle=345/1/0x4000000000000000 softirq=66138/66143 fqs=18 (t=10617 jiffies g=103609 q=1155) rcu: rcu_preempt kthread timer wakeup didn't happen for 618 jiffies! g103609 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=1 timer-softirq=40536 rcu: rcu_preempt kthread starved for 619 jiffies! g103609 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:26768 pid: 14 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0xc8d/0x1270 kernel/sched/core.c:6287 schedule+0x14b/0x210 kernel/sched/core.c:6366 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1881 rcu_gp_fqs_loop+0x1fd/0x770 kernel/rcu/tree.c:1957 rcu_gp_kthread+0xa5/0x350 kernel/rcu/tree.c:2130 kthread+0x453/0x480 kernel/kthread.c:319 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: 158 Comm: kworker/u4:3 Not tainted 5.15.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x4/0x60 kernel/kcov.c:196 Code: 00 00 0f 1f 40 00 be 0d 00 00 00 48 c7 c7 00 8c 95 8c e8 ff 60 4b 00 c3 cc cc cc cc cc cc cc cc cc cc cc cc cc cc 48 8b 04 24 <65> 48 8b 0c 25 c0 ef 01 00 65 8b 15 14 7d 7f 7e f7 c2 00 01 ff 00 RSP: 0018:ffffc9000142f818 EFLAGS: 00000202 RAX: ffffffff8176d73a RBX: 1ffff11017387305 RCX: ffff8880125a3900 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc9000142f960 R08: ffffffff8176d702 R09: ffffffff84354260 R10: 0000000000000009 R11: ffff8880125a3900 R12: 0000000000000000 R13: ffff8880b9c39828 R14: ffff8880b9d325c0 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4366edc000 CR3: 000000000c68e000 CR4: 00000000003506e0 Call Trace: csd_lock_wait kernel/smp.c:440 [inline] smp_call_function_many_cond+0xbca/0xda0 kernel/smp.c:969 on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1135 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:929 [inline] text_poke_bp_batch+0x310/0x940 arch/x86/kernel/alternative.c:1114 text_poke_flush arch/x86/kernel/alternative.c:1268 [inline] text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1275 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146 static_key_disable_cpuslocked+0xcc/0x1b0 kernel/jump_label.c:207 static_key_disable+0x16/0x20 kernel/jump_label.c:215 toggle_allocation_gate+0x3c8/0x460 mm/kfence/core.c:640 process_one_work+0x853/0x1140 kernel/workqueue.c:2297 worker_thread+0xac1/0x1320 kernel/workqueue.c:2444 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 NMI backtrace for cpu 0 CPU: 0 PID: 3716 Comm: systemd-udevd Not tainted 5.15.0-rc4-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:3880 [inline] rcu_sched_clock_irq+0x1e33/0x2bc0 kernel/rcu/tree.c:2599 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+0x3e/0xb0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 RIP: 0010:ffs arch/x86/include/asm/bitops.h:297 [inline] RIP: 0010:__do_softirq+0x1e3/0x7a3 kernel/softirq.c:546 Code: 70 66 0f 1f 44 00 00 0f b7 db 48 c7 c7 c0 3b 4d 8a e8 41 49 d9 ff 65 66 c7 05 67 09 e3 75 00 00 e8 42 ed 68 f7 fb 89 5c 24 34 ff ff ff ff 0f bc 44 24 34 41 89 c4 41 ff c4 0f 85 07 01 00 00 RSP: 0000:ffffc90000007e40 EFLAGS: 00000286 RAX: f8742b4938536900 RBX: 0000000000000386 RCX: ffffffff81648061 RDX: dffffc0000000000 RSI: 0000000000000102 RDI: 0000000000000000 RBP: ffffc90000007f50 R08: dffffc0000000000 R09: fffffbfff1fa33c3 R10: fffffbfff1fa33c3 R11: 0000000000000000 R12: ffff8880a08e8000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000000fdc __irq_exit_rcu+0xec/0x170 kernel/softirq.c:636 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648 sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 RIP: 0010:lock_is_held_type+0x141/0x190 Code: 75 40 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 46 41 f7 c4 00 02 00 00 74 01 fb 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 08 75 3c 89 d8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f RSP: 0000:ffffc90009e87558 EFLAGS: 00000206 RAX: f8742b4938536900 RBX: 0000000000000000 RCX: 0000000080000002 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000 RBP: 0000000000000003 R08: dffffc0000000000 R09: ffffed10173864a2 R10: ffffed10173864a2 R11: 0000000000000000 R12: 0000000000000246 R13: ffff8880a08e8000 R14: 00000000ffffffff R15: ffffffff8c91c120 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 rcu_lock_acquire+0x20/0x30 include/linux/rcupdate.h:267 rcu_read_lock include/linux/rcupdate.h:687 [inline] lock_page_memcg+0xbc/0x4a0 mm/memcontrol.c:1979 page_add_file_rmap+0x18a/0x930 mm/rmap.c:1216 do_set_pte+0x467/0x660 mm/memory.c:3981 filemap_map_pages+0x7fb/0xb50 mm/filemap.c:3329 do_fault_around mm/memory.c:4152 [inline] do_read_fault+0x39b/0x650 mm/memory.c:4167 do_fault mm/memory.c:4301 [inline] handle_pte_fault mm/memory.c:4559 [inline] __handle_mm_fault mm/memory.c:4694 [inline] handle_mm_fault+0x1849/0x2560 mm/memory.c:4792 do_user_addr_fault+0x8ce/0x10c0 arch/x86/mm/fault.c:1397 handle_page_fault arch/x86/mm/fault.c:1485 [inline] exc_page_fault+0xa1/0x1e0 arch/x86/mm/fault.c:1541 asm_exc_page_fault+0x1e/0x30 RIP: 0033:0x7f5b00285640 Code: Unable to access opcode bytes at RIP 0x7f5b00285616. RSP: 002b:00007ffe7af08f78 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 00005573a9b2ae10 RCX: 00007f5b0080b2f0 RDX: 0000000000000001 RSI: 00007f5b00807270 RDI: 00005573a8186384 RBP: 0000000000000000 R08: 00007f5b014b98c0 R09: 00007f5b00807270 R10: 00007f5b014b98c0 R11: 0000000000000206 R12: 00005573a9b29704 R13: 00005573a9b2a680 R14: 00005573a9b15010 R15: 00005573a9b15028 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 0f 1f 40 00 nopl 0x0(%rax) 6: be 0d 00 00 00 mov $0xd,%esi b: 48 c7 c7 00 8c 95 8c mov $0xffffffff8c958c00,%rdi 12: e8 ff 60 4b 00 callq 0x4b6116 17: c3 retq 18: cc int3 19: cc int3 1a: cc int3 1b: cc int3 1c: cc int3 1d: cc int3 1e: cc int3 1f: cc int3 20: cc int3 21: cc int3 22: cc int3 23: cc int3 24: cc int3 25: cc int3 26: 48 8b 04 24 mov (%rsp),%rax * 2a: 65 48 8b 0c 25 c0 ef mov %gs:0x1efc0,%rcx <-- trapping instruction 31: 01 00 33: 65 8b 15 14 7d 7f 7e mov %gs:0x7e7f7d14(%rip),%edx # 0x7e7f7d4e 3a: f7 c2 00 01 ff 00 test $0xff0100,%edx