rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 0, t=10502 jiffies, g=211793, q=2665) rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295067332-4295056830), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g211793 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200 rcu: Possible timer handling issue on cpu=1 timer-softirq=83012 rcu: rcu_preempt kthread starved for 10502 jiffies! g211793 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200 ->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:R stack:28696 pid: 14 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4969 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6250 schedule+0xd2/0x260 kernel/sched/core.c:6323 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881 rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1955 rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2128 kthread+0x405/0x4f0 kernel/kthread.c:327 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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 29162 Comm: systemd-udevd Not tainted 5.15.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:lockdep_enabled kernel/locking/lockdep.c:91 [inline] RIP: 0010:lock_is_held_type+0x3a/0x140 kernel/locking/lockdep.c:5661 Code: 48 83 ec 08 8b 0d 52 bf 36 04 85 c9 0f 84 d9 00 00 00 65 8b 05 97 95 c9 76 85 c0 0f 85 ca 00 00 00 65 4c 8b 24 25 40 70 02 00 <41> 8b 94 24 5c 0a 00 00 85 d2 0f 85 b1 00 00 00 48 89 fd 41 89 f6 RSP: 0018:ffffc90000dc0df0 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffff8880323f5b40 RCX: 0000000000000001 RDX: 1ffffffff17318e6 RSI: 00000000ffffffff RDI: ffffffff8b9838a0 RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff81672f5f R11: 0000000000000000 R12: ffff8880789d3a00 R13: 00000000ffffffff R14: ffff8880b9d2a400 R15: ffffffff875410b0 FS: 00007fa2a092f8c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005649e2342030 CR3: 0000000070af6000 CR4: 0000000000350ee0 Call Trace: lock_is_held include/linux/lockdep.h:283 [inline] rcu_read_lock_sched_held+0x3a/0x70 kernel/rcu/update.c:125 trace_hrtimer_expire_entry include/trace/events/timer.h:232 [inline] __run_hrtimer kernel/time/hrtimer.c:1682 [inline] __hrtimer_run_queues+0x9b0/0xe50 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c: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:preempt_count arch/x86/include/asm/preempt.h:27 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:197 Code: 01 f0 4d 89 03 e9 63 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 d9 ab 8a 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b RSP: 0018:ffffc90002f3f900 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000010 RCX: ffff8880789d3a00 RDX: 0000000000000000 RSI: ffff8880789d3a00 RDI: 0000000000000003 RBP: ffff8880180b9180 R08: 0000000000000000 R09: 0000000000000010 R10: ffffffff83a1c16a R11: 0000000000000010 R12: 0000000000000022 R13: 0000000000000059 R14: dffffc0000000000 R15: 0000000000000000 tomoyo_domain_quota_is_ok+0xf8/0x550 security/tomoyo/util.c:1054 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:1334 vfs_getattr fs/stat.c:157 [inline] vfs_fstat+0x43/0xb0 fs/stat.c:182 __do_sys_newfstat+0x81/0x100 fs/stat.c:422 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: 0033:0x7fa29f7a12e2 Code: 48 8b 05 b9 db 2b 00 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 83 ff 01 77 33 48 63 fe b8 05 00 00 00 48 89 d6 0f 05 <48> 3d 00 f0 ff ff 77 06 f3 c3 0f 1f 40 00 48 8b 15 81 db 2b 00 f7 RSP: 002b:00007ffc20ba9938 EFLAGS: 00000246 ORIG_RAX: 0000000000000005 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fa29f7a12e2 RDX: 00007ffc20ba9950 RSI: 00007ffc20ba9950 RDI: 000000000000000f RBP: 00007ffc20ba9af0 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000080000 R11: 0000000000000246 R12: 00005649e23519f0 R13: 00005649e2342e40 R14: 00005649e2357800 R15: 00007ffc20ba9ab0 ---------------- Code disassembly (best guess): 0: 48 83 ec 08 sub $0x8,%rsp 4: 8b 0d 52 bf 36 04 mov 0x436bf52(%rip),%ecx # 0x436bf5c a: 85 c9 test %ecx,%ecx c: 0f 84 d9 00 00 00 je 0xeb 12: 65 8b 05 97 95 c9 76 mov %gs:0x76c99597(%rip),%eax # 0x76c995b0 19: 85 c0 test %eax,%eax 1b: 0f 85 ca 00 00 00 jne 0xeb 21: 65 4c 8b 24 25 40 70 mov %gs:0x27040,%r12 28: 02 00 * 2a: 41 8b 94 24 5c 0a 00 mov 0xa5c(%r12),%edx <-- trapping instruction 31: 00 32: 85 d2 test %edx,%edx 34: 0f 85 b1 00 00 00 jne 0xeb 3a: 48 89 fd mov %rdi,%rbp 3d: 41 89 f6 mov %esi,%r14d