rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (0 ticks this GP) idle=399/1/0x4000000000000000 softirq=98445/98445 fqs=5 (detected by 0, t=10502 jiffies, g=155181, q=186 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 3641 Comm: syz-executor.4 Not tainted 5.19.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:check_kcov_mode kernel/kcov.c:166 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x7/0x60 kernel/kcov.c:200 Code: 4b 00 5d be 03 00 00 00 e9 36 30 82 02 66 0f 1f 44 00 00 48 8b be a8 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 65 8b 05 59 cc 88 7e <89> c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b 14 25 80 6f 02 00 a9 RSP: 0018:ffffc900003f8e38 EFLAGS: 00000002 RAX: 0000000000010001 RBX: ffff888078a49b40 RCX: ffffffff8169e695 RDX: ffff888076ee4040 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: 17bd4a7faf7a94ff R13: ffff8880b9b2a600 R14: ffff8880b9b2a500 R15: 0000000000000001 FS: 000055555715c400(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7fb52d53a5 CR3: 0000000048649000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> debug_hrtimer_deactivate kernel/time/hrtimer.c:425 [inline] debug_deactivate kernel/time/hrtimer.c:481 [inline] __run_hrtimer kernel/time/hrtimer.c:1653 [inline] __hrtimer_run_queues+0x3e9/0xe50 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1112 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1106 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:649 RIP: 0010:prefetchw arch/x86/include/asm/processor.h:743 [inline] RIP: 0010:slab_alloc mm/slab.c:3298 [inline] RIP: 0010:__kmem_cache_alloc_lru mm/slab.c:3479 [inline] RIP: 0010:kmem_cache_alloc+0x195/0x560 mm/slab.c:3499 Code: 0f 84 a2 01 00 00 4d 85 f6 4c 89 7c 24 08 0f 85 39 02 00 00 9c 58 f6 c4 02 0f 85 b1 02 00 00 4d 85 f6 74 01 fb 48 8b 74 24 08 <0f> 0d 0e 0f 1f 44 00 00 48 83 7b 50 00 0f 84 8e 00 00 00 44 23 25 RSP: 0018:ffffc90003197948 EFLAGS: 00000206 RAX: 0000000000000006 RBX: ffff888140092300 RCX: 1ffffffff20d249e RDX: 0000000000000000 RSI: ffff888032d8b2a0 RDI: 0000000000000000 RBP: ffff88807efd0680 R08: 0000000000000001 R09: ffffffff90679947 R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000002800 R13: 0000000000002800 R14: 0000000000000200 R15: ffff888032d8b2a0 anon_vma_chain_alloc mm/rmap.c:140 [inline] anon_vma_clone+0xe0/0x5f0 mm/rmap.c:286 anon_vma_fork+0x82/0x630 mm/rmap.c:349 dup_mmap kernel/fork.c:658 [inline] dup_mm+0xa07/0x1390 kernel/fork.c:1524 copy_mm kernel/fork.c:1576 [inline] copy_process+0x3bba/0x7020 kernel/fork.c:2240 kernel_clone+0xe7/0xab0 kernel/fork.c:2655 __do_sys_clone+0xba/0x100 kernel/fork.c:2789 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7f7fb42876fb Code: ed 0f 85 60 01 00 00 64 4c 8b 0c 25 10 00 00 00 45 31 c0 4d 8d 91 d0 02 00 00 31 d2 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 89 00 00 00 41 89 c5 85 c0 0f 85 90 00 00 RSP: 002b:00007ffc93b250f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f7fb42876fb RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000000001 R08: 0000000000000000 R09: 000055555715c400 R10: 000055555715c6d0 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffc93b251d0 </TASK> rcu: rcu_preempt kthread starved for 10492 jiffies! g155181 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:28320 pid: 17 ppid: 2 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5116 [inline] __schedule+0xa00/0x4b30 kernel/sched/core.c:6428 schedule+0xd2/0x1f0 kernel/sched/core.c:6500 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1935 rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1999 rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2187 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 </TASK> rcu: Stack dump where RCU GP kthread last ran: NMI backtrace for cpu 0 CPU: 0 PID: 15917 Comm: kworker/u4:13 Not tainted 5.19.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound toggle_allocation_gate Call Trace: <IRQ> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x1e6/0x230 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_check_gp_kthread_starvation.cold+0x1fb/0x200 kernel/rcu/tree_stall.h:518 print_other_cpu_stall kernel/rcu/tree_stall.h:623 [inline] check_cpu_stall kernel/rcu/tree_stall.h:771 [inline] rcu_pending kernel/rcu/tree.c:3977 [inline] rcu_sched_clock_irq+0x2316/0x2370 kernel/rcu/tree.c:2675 update_process_times+0x11a/0x1a0 kernel/time/timer.c:1839 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:243 tick_sched_timer+0xee/0x120 kernel/time/tick-sched.c:1481 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1112 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1106 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:649 RIP: 0010:write_comp_data+0x3c/0x90 kernel/kcov.c:229 Code: 01 00 00 49 89 f8 65 48 8b 14 25 80 6f 02 00 a9 00 01 ff 00 74 0e 85 f6 74 59 8b 82 a4 15 00 00 85 c0 74 4f 8b 82 80 15 00 00 <83> f8 03 75 44 48 8b 82 88 15 00 00 8b 92 84 15 00 00 48 8b 38 48 RSP: 0018:ffffc90006b97948 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff8880b9b3f760 RCX: ffffffff816f07cd RDX: ffff88807e6280c0 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: ffffed1017367eed R13: 0000000000000001 R14: 0000000000000001 R15: dffffc0000000000 csd_lock_wait kernel/smp.c:414 [inline] smp_call_function_many_cond+0x4bd/0x1110 kernel/smp.c:988 on_each_cpu_cond_mask+0x56/0xa0 kernel/smp.c:1154 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:1231 [inline] text_poke_bp_batch+0x233/0x6c0 arch/x86/kernel/alternative.c:1419 text_poke_flush arch/x86/kernel/alternative.c:1589 [inline] text_poke_flush arch/x86/kernel/alternative.c:1586 [inline] text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1596 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146 jump_label_update+0x32f/0x410 kernel/jump_label.c:830 static_key_enable_cpuslocked+0x1b1/0x260 kernel/jump_label.c:177 static_key_enable+0x16/0x20 kernel/jump_label.c:190 toggle_allocation_gate mm/kfence/core.c:808 [inline] toggle_allocation_gate+0x100/0x390 mm/kfence/core.c:800 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 </TASK> watchdog: BUG: soft lockup - CPU#0 stuck for 226s! [kworker/u4:13:15917] Modules linked in: irq event stamp: 13077720 hardirqs last enabled at (13077719): [<ffffffff89800c8b>] asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:649 hardirqs last disabled at (13077720): [<ffffffff8976b75b>] sysvec_apic_timer_interrupt+0xb/0xc0 arch/x86/kernel/apic/apic.c:1106 softirqs last enabled at (13030296): [<ffffffff81477753>] invoke_softirq kernel/softirq.c:445 [inline] softirqs last enabled at (13030296): [<ffffffff81477753>] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650 softirqs last disabled at (13030231): [<ffffffff81477753>] invoke_softirq kernel/softirq.c:445 [inline] softirqs last disabled at (13030231): [<ffffffff81477753>] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650 CPU: 0 PID: 15917 Comm: kworker/u4:13 Not tainted 5.19.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:414 [inline] RIP: 0010:smp_call_function_many_cond+0x499/0x1110 kernel/smp.c:988 Code: 01 89 ee e8 99 97 0a 00 85 ed 74 47 48 8b 04 24 49 89 c4 83 e0 07 49 c1 ec 03 48 89 c5 4d 01 fc 83 c5 03 e8 39 9b 0a 00 f3 90 <41> 0f b6 04 24 40 38 c5 7c 08 84 c0 0f 85 21 0a 00 00 8b 43 08 31 RSP: 0018:ffffc90006b97950 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff8880b9b3f760 RCX: 0000000000000000 RDX: ffff88807e6280c0 RSI: ffffffff816f07a7 RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: ffffed1017367eed R13: 0000000000000001 R14: 0000000000000001 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020083030 CR3: 000000000ba8e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> on_each_cpu_cond_mask+0x56/0xa0 kernel/smp.c:1154 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:1231 [inline] text_poke_bp_batch+0x233/0x6c0 arch/x86/kernel/alternative.c:1419 text_poke_flush arch/x86/kernel/alternative.c:1589 [inline] text_poke_flush arch/x86/kernel/alternative.c:1586 [inline] text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1596 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146 jump_label_update+0x32f/0x410 kernel/jump_label.c:830 static_key_enable_cpuslocked+0x1b1/0x260 kernel/jump_label.c:177 static_key_enable+0x16/0x20 kernel/jump_label.c:190 toggle_allocation_gate mm/kfence/core.c:808 [inline] toggle_allocation_gate+0x100/0x390 mm/kfence/core.c:800 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 </TASK> Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 3641 Comm: syz-executor.4 Not tainted 5.19.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:hlock_class kernel/locking/lockdep.c:227 [inline] RIP: 0010:__lock_acquire+0x145a/0x5660 kernel/locking/lockdep.c:5049 Code: f8 66 81 e3 ff 1f 0f b7 db be 08 00 00 00 48 89 d8 48 c1 f8 06 48 8d 3c c5 00 99 67 90 e8 7e 99 68 00 48 0f a3 1d 16 69 0a 0f <0f> 83 2c 06 00 00 48 8d 1c 5b 48 c1 e3 06 48 81 c3 20 9d 67 90 48 RSP: 0018:ffffc900003f8af0 EFLAGS: 00000047 RAX: 0000000000000001 RBX: 0000000000000059 RCX: ffffffff815d2fe2 RDX: fffffbfff20cf322 RSI: 0000000000000008 RDI: ffffffff90679908 RBP: ffff888076ee4b8a R08: 0000000000000000 R09: ffffffff9067990f R10: fffffbfff20cf321 R11: 0000000000000001 R12: ffff888076ee4b68 R13: ffff888076ee4040 R14: 0000000000000000 R15: a998246c83877c37 FS: 000055555715c400(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7fb52d53a5 CR3: 0000000048649000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> lock_acquire kernel/locking/lockdep.c:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 debug_object_deactivate lib/debugobjects.c:732 [inline] debug_object_deactivate+0x101/0x300 lib/debugobjects.c:720 debug_hrtimer_deactivate kernel/time/hrtimer.c:425 [inline] debug_deactivate kernel/time/hrtimer.c:481 [inline] __run_hrtimer kernel/time/hrtimer.c:1653 [inline] __hrtimer_run_queues+0x3f8/0xe50 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1112 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1106 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:649 RIP: 0010:prefetchw arch/x86/include/asm/processor.h:743 [inline] RIP: 0010:slab_alloc mm/slab.c:3298 [inline] RIP: 0010:__kmem_cache_alloc_lru mm/slab.c:3479 [inline] RIP: 0010:kmem_cache_alloc+0x195/0x560 mm/slab.c:3499 Code: 0f 84 a2 01 00 00 4d 85 f6 4c 89 7c 24 08 0f 85 39 02 00 00 9c 58 f6 c4 02 0f 85 b1 02 00 00 4d 85 f6 74 01 fb 48 8b 74 24 08 <0f> 0d 0e 0f 1f 44 00 00 48 83 7b 50 00 0f 84 8e 00 00 00 44 23 25 RSP: 0018:ffffc90003197948 EFLAGS: 00000206 RAX: 0000000000000006 RBX: ffff888140092300 RCX: 1ffffffff20d249e RDX: 0000000000000000 RSI: ffff888032d8b2a0 RDI: 0000000000000000 RBP: ffff88807efd0680 R08: 0000000000000001 R09: ffffffff90679947 R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000002800 R13: 0000000000002800 R14: 0000000000000200 R15: ffff888032d8b2a0 anon_vma_chain_alloc mm/rmap.c:140 [inline] anon_vma_clone+0xe0/0x5f0 mm/rmap.c:286 anon_vma_fork+0x82/0x630 mm/rmap.c:349 dup_mmap kernel/fork.c:658 [inline] dup_mm+0xa07/0x1390 kernel/fork.c:1524 copy_mm kernel/fork.c:1576 [inline] copy_process+0x3bba/0x7020 kernel/fork.c:2240 kernel_clone+0xe7/0xab0 kernel/fork.c:2655 __do_sys_clone+0xba/0x100 kernel/fork.c:2789 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7f7fb42876fb Code: ed 0f 85 60 01 00 00 64 4c 8b 0c 25 10 00 00 00 45 31 c0 4d 8d 91 d0 02 00 00 31 d2 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 89 00 00 00 41 89 c5 85 c0 0f 85 90 00 00 RSP: 002b:00007ffc93b250f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f7fb42876fb RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000000001 R08: 0000000000000000 R09: 000055555715c400 R10: 000055555715c6d0 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffc93b251d0 </TASK> ---------------- Code disassembly (best guess): 0: 4b 00 5d be rex.WXB add %bl,-0x42(%r13) 4: 03 00 add (%rax),%eax 6: 00 00 add %al,(%rax) 8: e9 36 30 82 02 jmpq 0x2823043 d: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1) 13: 48 8b be a8 01 00 00 mov 0x1a8(%rsi),%rdi 1a: e8 b4 ff ff ff callq 0xffffffd3 1f: 31 c0 xor %eax,%eax 21: c3 retq 22: 90 nop 23: 65 8b 05 59 cc 88 7e mov %gs:0x7e88cc59(%rip),%eax # 0x7e88cc83 * 2a: 89 c1 mov %eax,%ecx <-- trapping instruction 2c: 48 8b 34 24 mov (%rsp),%rsi 30: 81 e1 00 01 00 00 and $0x100,%ecx 36: 65 48 8b 14 25 80 6f mov %gs:0x26f80,%rdx 3d: 02 00 3f: a9 .byte 0xa9