rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (10499 ticks this GP) idle=366/1/0x4000000000000002 softirq=10956/10956 fqs=2776 (t=10500 jiffies g=6269 q=167) rcu: rcu_preempt kthread starved for 4931 jiffies! g6269 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 28992 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 1 CPU: 1 PID: 8204 Comm: syz-executor.0 Not tainted 5.4.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c: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:1514 [inline] __hrtimer_run_queues+0x403/0x840 kernel/time/hrtimer.c:1576 hrtimer_interrupt+0x38c/0xda0 kernel/time/hrtimer.c:1638 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:mod_memcg_page_state+0x3d/0x190 include/linux/memcontrol.h:653 Code: 28 2e 00 48 83 c3 38 48 89 d8 48 c1 e8 03 49 bc 00 00 00 00 00 fc ff df 42 80 3c 20 00 74 08 48 89 df e8 b6 9f 69 00 48 8b 1b <48> 85 db 0f 84 d8 00 00 00 48 c7 c0 20 96 0a 89 48 c1 e8 03 42 80 RSP: 0018:ffffc90002767298 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 1ffffd400053b657 RBX: 0000000000000000 RCX: ffff88809fd36580 RDX: 0000000000000000 RSI: 00000000fffffffc RDI: ffffea00029db280 RBP: ffffc900027672b8 R08: 000000000003a768 R09: fffffbfff120248a R10: fffffbfff120248a R11: 0000000000000000 R12: dffffc0000000000 R13: dffffc0000000000 R14: 00000000fffffffc R15: ffff88808dc61828 free_thread_stack+0x168/0x590 kernel/fork.c:280 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:arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline] RIP: 0010:lock_release+0x4c7/0x780 kernel/locking/lockdep.c:4506 Code: 48 c1 e8 03 80 3c 10 00 74 0c 48 c7 c7 28 96 0a 89 e8 9d 5b 56 00 48 83 3d bd de ae 07 00 0f 84 8c 02 00 00 48 8b 7d 88 57 9d <0f> 1f 44 00 00 65 48 8b 04 25 28 00 00 00 48 3b 45 d0 0f 85 70 02 RSP: 0018:ffffc90002767518 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff12152c5 RBX: ffff88809fd36e08 RCX: ffffffff815bbb47 RDX: dffffc0000000000 RSI: ffff88809fd36eb0 RDI: 0000000000000286 RBP: ffffc90002767598 R08: dffffc0000000000 R09: fffffbfff1287025 R10: fffffbfff1287025 R11: 0000000000000000 R12: 0000000000000003 R13: 0000000000000000 R14: 5aa0b2c673040133 R15: 000000000002002b rcu_lock_release+0x21/0x30 include/linux/rcupdate.h:213 rcu_read_unlock include/linux/rcupdate.h:671 [inline] is_bpf_text_address+0x358/0x370 kernel/bpf/core.c:709 kernel_text_address kernel/extable.c:149 [inline] __kernel_text_address+0x9a/0x110 kernel/extable.c:104 unwind_get_return_address+0x4c/0x90 arch/x86/kernel/unwind_frame.c:19 arch_stack_walk+0x98/0xe0 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0xb6/0x150 kernel/stacktrace.c:123 save_stack mm/kasan/common.c:71 [inline] set_track mm/kasan/common.c:79 [inline] __kasan_kmalloc+0x11c/0x1b0 mm/kasan/common.c:512 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:520 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc mm/slab.c:3320 [inline] kmem_cache_alloc_trace+0x1fa/0x2f0 mm/slab.c:3549 kmalloc include/linux/slab.h:556 [inline] tomoyo_print_header security/tomoyo/audit.c:156 [inline] tomoyo_init_log+0x151/0x1e70 security/tomoyo/audit.c:255 tomoyo_supervisor+0x2c7/0x1330 security/tomoyo/common.c:2095 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:4148 __do_sys_symlink fs/namei.c:4169 [inline] __se_sys_symlink fs/namei.c:4167 [inline] __x64_sys_symlink+0x60/0x70 fs/namei.c:4167 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a3a7 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:00007fff45eb01a8 EFLAGS: 00000202 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045a3a7 RDX: 00007fff45eb0247 RSI: 00000000004c00d3 RDI: 00007fff45eb0230 RBP: 0000000000000000 R08: 0000000000000220 R09: 0000000000000017 R10: 0000000000000075 R11: 0000000000000202 R12: 0000000000000001 R13: 00007fff45eb01e0 R14: 0000000000000000 R15: 00007fff45eb01f0