rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (10499 ticks this GP) idle=ed2/1/0x4000000000000002 softirq=15993/15993 fqs=2757 (t=10501 jiffies g=7409 q=365) rcu: rcu_preempt kthread starved for 4988 jiffies! g7409 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29032 10 2 0x80004000 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x9a0/0xcc0 kernel/sched/core.c:4081 schedule+0x181/0x210 kernel/sched/core.c:4155 schedule_timeout+0x14f/0x240 kernel/time/timer.c:1895 rcu_gp_fqs_loop kernel/rcu/tree.c:1661 [inline] rcu_gp_kthread+0xed8/0x1770 kernel/rcu/tree.c:1821 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 NMI backtrace for cpu 0 CPU: 0 PID: 8888 Comm: syz-executor.0 Not tainted 5.5.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fb/0x318 lib/dump_stack.c:118 nmi_cpu_backtrace+0xaf/0x1a0 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x174/0x290 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x15a/0x220 kernel/rcu/tree_stall.h:254 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline] check_cpu_stall kernel/rcu/tree_stall.h:529 [inline] rcu_pending kernel/rcu/tree.c:2827 [inline] rcu_sched_clock_irq+0xe25/0x1ad0 kernel/rcu/tree.c:2271 update_process_times+0x12d/0x180 kernel/time/timer.c:1726 tick_sched_handle kernel/time/tick-sched.c:167 [inline] tick_sched_timer+0x263/0x420 kernel/time/tick-sched.c:1310 __run_hrtimer kernel/time/hrtimer.c:1517 [inline] __hrtimer_run_queues+0x403/0x840 kernel/time/hrtimer.c:1579 hrtimer_interrupt+0x38c/0xda0 kernel/time/hrtimer.c:1641 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline] smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:__memcg_kmem_uncharge+0x6/0x1a0 mm/memcontrol.c:2908 Code: bf ac 07 00 74 12 48 81 c3 08 02 00 00 48 89 df 4c 89 f6 e8 8c 85 ff ff 5b 41 5e 5d c3 0f 1f 80 00 00 00 00 55 48 89 e5 41 57 <41> 56 41 55 41 54 53 50 89 f3 49 89 fc 48 b8 00 00 00 00 00 fc ff RSP: 0018:ffffc90002b47300 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffffffff81489244 RBX: ffffea0002494c00 RCX: ffff888088d9a4c0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffea0002494c00 RBP: ffffc90002b47308 R08: 000000000003a728 R09: fffffbfff124248a R10: fffffbfff124248a R11: 0000000000000000 R12: ffff8880a28c19a0 R13: dffffc0000000000 R14: 1ffff11014518334 R15: ffff8880a82c1678 memcg_kmem_uncharge include/linux/memcontrol.h:1402 [inline] free_thread_stack+0x12e/0x590 kernel/fork.c:284 release_task_stack kernel/fork.c:440 [inline] put_task_stack+0xa3/0x130 kernel/fork.c:451 finish_task_switch+0x3f1/0x550 kernel/sched/core.c:3256 context_switch kernel/sched/core.c:3388 [inline] __schedule+0x9a8/0xcc0 kernel/sched/core.c:4081 preempt_schedule_irq+0xc1/0x140 kernel/sched/core.c:4338 retint_kernel+0x1b/0x2b RIP: 0010:check_kcov_mode kernel/kcov.c:164 [inline] RIP: 0010:write_comp_data kernel/kcov.c:208 [inline] RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x22/0x90 kernel/kcov.c:274 Code: 0f 1f 84 00 00 00 00 00 4c 8b 04 24 65 48 8b 04 25 c0 1d 02 00 65 8b 0d 98 5b 8b 7e f7 c1 00 01 1f 00 75 64 8b 88 80 13 00 00 <83> f9 03 75 59 4c 8b 90 88 13 00 00 8b 90 84 13 00 00 48 c1 e2 03 RSP: 0018:ffffc90002b47568 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffff888088d9a4c0 RBX: 1ffff92000568ecf RCX: 0000000000000000 RDX: ffffc90002b4767c RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90002b475c0 R08: ffffffff8165c225 R09: ffffc90002b475d0 R10: fffff52000568ec6 R11: 0000000000000000 R12: ffffc90002b47670 R13: 1ffff92000568ed0 R14: 0000000000000000 R15: 0000000000000000 arch_stack_walk+0xa8/0xe0 arch/x86/kernel/stacktrace.c:27 stack_trace_save+0xb6/0x150 kernel/stacktrace.c:123 save_stack mm/kasan/common.c:72 [inline] set_track mm/kasan/common.c:80 [inline] __kasan_kmalloc+0x11c/0x1b0 mm/kasan/common.c:513 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:521 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc mm/slab.c:3320 [inline] __do_kmalloc mm/slab.c:3654 [inline] __kmalloc+0x22b/0x340 mm/slab.c:3665 kmalloc include/linux/slab.h:561 [inline] kzalloc+0x1f/0x40 include/linux/slab.h:670 tomoyo_commit_ok+0x23/0x1d0 security/tomoyo/memory.c:76 tomoyo_update_domain+0x4ef/0x7c0 security/tomoyo/domain.c:139 tomoyo_update_path_acl security/tomoyo/file.c:398 [inline] tomoyo_write_file+0x322/0x1040 security/tomoyo/file.c:1022 tomoyo_write_domain2 security/tomoyo/common.c:1152 [inline] tomoyo_add_entry security/tomoyo/common.c:2042 [inline] tomoyo_supervisor+0x1021/0x1330 security/tomoyo/common.c:2103 tomoyo_audit_path_log security/tomoyo/file.c:168 [inline] tomoyo_path_permission security/tomoyo/file.c:587 [inline] tomoyo_path_perm+0x5c3/0x850 security/tomoyo/file.c:838 tomoyo_path_symlink+0x95/0xc0 security/tomoyo/tomoyo.c:206 security_path_symlink+0xed/0x170 security/security.c:1053 do_symlinkat+0xf3/0x3f0 fs/namei.c:4156 __do_sys_symlink fs/namei.c:4177 [inline] __se_sys_symlink fs/namei.c:4175 [inline] __x64_sys_symlink+0x60/0x70 fs/namei.c:4175 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45ac77 Code: 0f 1f 00 b8 5c 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 6d b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 58 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 4d b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fff97e92398 EFLAGS: 00000202 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045ac77 RDX: 00007fff97e92437 RSI: 00000000004c0a21 RDI: 00007fff97e92420 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000017 R10: 0000000000000075 R11: 0000000000000202 R12: 0000000000000001 R13: 00007fff97e923d0 R14: 0000000000000000 R15: 00007fff97e923e0