rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (0 ticks this GP) idle=e69/1/0x4000000000000000 softirq=24431/24431 fqs=0 (detected by 1, t=10502 jiffies, g=42201, q=79) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 2972 Comm: systemd-udevd Not tainted 5.15.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__run_hrtimer kernel/time/hrtimer.c:1687 [inline] RIP: 0010:__hrtimer_run_queues+0x648/0xe50 kernel/time/hrtimer.c:1749 Code: 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 45 07 00 00 48 8b 44 24 18 c7 80 e0 09 00 00 00 00 00 00 76 fb ff ff e8 7e 4d 10 00 65 44 8b 25 1e d7 9b 7e bf 07 00 00 RSP: 0018:ffffc90000007e40 EFLAGS: 00000046 RAX: ffff888019ce9c80 RBX: ffff88807dffe340 RCX: ffffc90000007d58 RDX: 1ffff1100339d4cc RSI: 0000000000010000 RDI: ffff888019cea660 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: ffff8880b9c224c0 R14: ffff8880b9c223c0 R15: 0000000000000001 FS: 00007f5ef64b98c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f415f876058 CR3: 000000001b654000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x7/0x60 kernel/kcov.c:197 Code: fd ff ff b9 ff ff ff ff ba 08 00 00 00 4d 8b 03 48 0f bd ca 49 8b 45 00 48 63 c9 e9 64 ff ff ff 0f 1f 00 65 8b 05 39 e4 8b 7e <89> c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b 14 25 40 f0 01 00 a9 RSP: 0018:ffffc90002bcf860 EFLAGS: 00000246 RAX: 0000000080000000 RBX: 000000000000000a RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff888019ce9c80 RDI: 0000000000000003 RBP: ffff88801d0cf080 R08: 0000000000000000 R09: 000000000000000a R10: ffffffff83a21ea7 R11: 0000000000000010 R12: 0000000000000020 R13: 000000000000002f R14: dffffc0000000000 R15: 0000000000000000 tomoyo_domain_quota_is_ok+0x31a/0x550 security/tomoyo/util.c:1092 tomoyo_supervisor+0x2f2/0xf00 security/tomoyo/common.c:2089 tomoyo_audit_path_log security/tomoyo/file.c:168 [inline] tomoyo_path_permission security/tomoyo/file.c:587 [inline] tomoyo_path_permission+0x270/0x3a0 security/tomoyo/file.c:573 tomoyo_path_perm+0x2f0/0x400 security/tomoyo/file.c:838 security_inode_getattr+0xcf/0x140 security/security.c:1333 vfs_getattr fs/stat.c:157 [inline] vfs_statx+0x164/0x390 fs/stat.c:225 vfs_fstatat fs/stat.c:243 [inline] vfs_lstat include/linux/fs.h:3356 [inline] __do_sys_newlstat+0x91/0x110 fs/stat.c:398 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+0x44/0xae RIP: 0033:0x7f5ef532b335 Code: 69 db 2b 00 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 83 ff 01 48 89 f0 77 30 48 89 c7 48 89 d6 b8 06 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 03 f3 c3 90 48 8b 15 31 db 2b 00 f7 d8 64 89 RSP: 002b:00007fff35d6e458 EFLAGS: 00000246 ORIG_RAX: 0000000000000006 RAX: ffffffffffffffda RBX: 000055980507f320 RCX: 00007f5ef532b335 RDX: 00007fff35d6e490 RSI: 00007fff35d6e490 RDI: 000055980507e320 RBP: 00007fff35d6e550 R08: 00007f5ef55ea1e8 R09: 0000000000001010 R10: 00007f5ef55e9b58 R11: 0000000000000246 R12: 000055980507e320 R13: 000055980507e340 R14: 000055980508a52b R15: 000055980508a530 rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g42201 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=0 timer-softirq=12559 rcu: rcu_preempt kthread starved for 10502 jiffies! g42201 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:28696 pid: 14 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881 rcu_gp_fqs_loop+0x186/0x800 kernel/rcu/tree.c:1957 rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2130 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 1 to CPUs 0: ---------------- Code disassembly (best guess), 3 bytes skipped: 0: df 48 89 fisttps -0x77(%rax) 3: fa cli 4: 48 c1 ea 03 shr $0x3,%rdx 8: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax c: 84 c0 test %al,%al e: 74 08 je 0x18 10: 3c 03 cmp $0x3,%al 12: 0f 8e 45 07 00 00 jle 0x75d 18: 48 8b 44 24 18 mov 0x18(%rsp),%rax 1d: c7 80 e0 09 00 00 00 movl $0x0,0x9e0(%rax) 24: 00 00 00 * 27: e9 76 fb ff ff jmpq 0xfffffba2 <-- trapping instruction 2c: e8 7e 4d 10 00 callq 0x104daf 31: 65 44 8b 25 1e d7 9b mov %gs:0x7e9bd71e(%rip),%r12d # 0x7e9bd757 38: 7e 39: bf .byte 0xbf 3a: 07 (bad)