INFO: rcu detected stall in newfstat

INFO: rcu detected stall in newfstat
Status: auto-closed as invalid on 2021/09/03 09:43
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 173d, last: 173d
similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	INFO: rcu detected stall in newfstat (2)	C			1	8h28m	5h57m	0/22	upstream: reported C repro on 2021/10/19 16:22
Sample crash report:
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (2 ticks this GP) idle=a16/1/0x4000000000000000 softirq=42206/42213 fqs=3 
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1):
	(detected by 0, t=10502 jiffies, g=65529, q=130)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 20765 Comm: systemd-udevd Not tainted 5.12.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:find_held_lock+0xe3/0x110 kernel/locking/lockdep.c:5026
Code: 45 31 e4 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 0f b6 14 02 4c 89 f0 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 11 5b <45> 89 3e 4c 89 e0 5d 41 5c 41 5d 41 5e 41 5f c3 4c 89 f7 e8 45 19
RSP: 0018:ffffc90000dc0cb8 EFLAGS: 00000097
RAX: 0000000000000003 RBX: 0000000000000007 RCX: ffffc90000dc0d38
RDX: 0000000000000004 RSI: ffff88802fd16b00 RDI: ffff888079230a20
RBP: 1ffff920001b819f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff888079230a20
R13: ffff88802fd16b00 R14: ffffc90000dc0d38 R15: 0000000000000001
FS:  00007f26618028c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000970004 CR3: 000000008a533000 CR4: 0000000000350ee0
Call Trace:
 <IRQ>
 __lock_release kernel/locking/lockdep.c:5189 [inline]
 lock_release+0x1f2/0x720 kernel/locking/lockdep.c:5532
 __raw_spin_unlock include/linux/spinlock_api_smp.h:150 [inline]
 _raw_spin_unlock+0x12/0x40 kernel/locking/spinlock.c:183
 spin_unlock include/linux/spinlock.h:394 [inline]
 advance_sched+0x469/0x990 net/sched/sch_taprio.c:749
 __run_hrtimer kernel/time/hrtimer.c:1537 [inline]
 __hrtimer_run_queues+0x609/0xe40 kernel/time/hrtimer.c:1601
 hrtimer_interrupt+0x330/0xa00 kernel/time/hrtimer.c:1663
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1106
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
RIP: 0010:__sanitizer_cov_trace_pc+0x37/0x60 kernel/kcov.c:197
Code: 81 e1 00 01 00 00 65 48 8b 14 25 00 f0 01 00 a9 00 01 ff 00 74 0e 85 c9 74 35 8b 82 3c 15 00 00 85 c0 74 2b 8b 82 18 15 00 00 <83> f8 02 75 20 48 8b 8a 20 15 00 00 8b 92 1c 15 00 00 48 8b 01 48
RSP: 0018:ffffc9000a5af900 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888079230000 RSI: ffffffff83958d8a RDI: 0000000000000003
RBP: ffff8880152be800 R08: 0000000000000000 R09: ffffffff83958c39
R10: ffffffff83958d77 R11: 0000000000000002 R12: 0000000000000020
R13: 0000000000000310 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:1295
 vfs_getattr fs/stat.c:131 [inline]
 vfs_fstat+0x43/0xb0 fs/stat.c:156
 __do_sys_newfstat+0x81/0x100 fs/stat.c:396
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f26606742e2
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:00007ffe919bd8e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000005
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f26606742e2
RDX: 00007ffe919bd900 RSI: 00007ffe919bd900 RDI: 000000000000000f
RBP: 00007ffe919bda80 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000080000 R11: 0000000000000246 R12: 000055981d9097d0
R13: 000055981d91d9f0 R14: 00007ffe919bd9e0 R15: 00007ffe919bda40
task:systemd-udevd   state:R  running task     stack:22720 pid: 4836 ppid:     1 flags:0x00000000
Call Trace:
 context_switch kernel/sched/core.c:4339 [inline]
 __schedule+0x916/0x2410 kernel/sched/core.c:5147
 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:5307
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:35
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
 _raw_spin_unlock_irqrestore+0x57/0x70 kernel/locking/spinlock.c:191
 spin_unlock_irqrestore include/linux/spinlock.h:409 [inline]
 __wake_up_common_lock+0xde/0x130 kernel/sched/wait.c:140
 sock_def_readable+0x11f/0x4c0 net/core/sock.c:2910
 __netlink_sendskb net/netlink/af_netlink.c:1259 [inline]
 netlink_sendskb net/netlink/af_netlink.c:1265 [inline]
 netlink_unicast+0x6d1/0x7d0 net/netlink/af_netlink.c:1353
 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:674
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2350
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2404
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2433
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f2660948e67
RSP: 002b:00007ffe919be4a8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000055981d927e80 RCX: 00007f2660948e67
RDX: 0000000000000000 RSI: 00007ffe919be4c0 RDI: 0000000000000004
RBP: 00007ffe919be4c0 R08: 000055981d908e74 R09: 0000000000000000
R10: 0000000000000018 R11: 0000000000000246 R12: 000055981d90ccf0
R13: 000000000000009b R14: 000055981d91c210 R15: 0000000000000000
rcu: rcu_preempt kthread starved for 10496 jiffies! g65529 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:29168 pid:   14 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:4339 [inline]
 __schedule+0x916/0x2410 kernel/sched/core.c:5147
 schedule+0xcf/0x270 kernel/sched/core.c:5226
 schedule_timeout+0x14a/0x250 kernel/time/timer.c:1892
 rcu_gp_fqs_loop kernel/rcu/tree.c:2004 [inline]
 rcu_gp_kthread+0xd07/0x2280 kernel/rcu/tree.c:2177
 kthread+0x3b1/0x4a0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 0
CPU: 0 PID: 22303 Comm: syz-executor.1 Not tainted 5.12.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x141/0x1d7 lib/dump_stack.c:120
 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_check_gp_kthread_starvation.cold+0x1cc/0x1d1 kernel/rcu/tree_stall.h:478
 print_other_cpu_stall kernel/rcu/tree_stall.h:583 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:708 [inline]
 rcu_pending kernel/rcu/tree.c:3911 [inline]
 rcu_sched_clock_irq+0x1d46/0x2080 kernel/rcu/tree.c:2649
 update_process_times+0x16d/0x200 kernel/time/timer.c:1796
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1373
 __run_hrtimer kernel/time/hrtimer.c:1537 [inline]
 __hrtimer_run_queues+0x1c0/0xe40 kernel/time/hrtimer.c:1601
 hrtimer_interrupt+0x330/0xa00 kernel/time/hrtimer.c:1663
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1106
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
RIP: 0010:csd_lock_wait kernel/smp.c:440 [inline]
RIP: 0010:smp_call_function_single+0x1b0/0x4b0 kernel/smp.c:758
Code: 10 8b 7c 24 1c 48 8d 74 24 40 48 89 44 24 50 48 8b 44 24 08 48 89 44 24 58 e8 bc fa ff ff 41 89 c5 eb 07 e8 f2 45 0b 00 f3 90 <44> 8b 64 24 48 31 ff 41 83 e4 01 44 89 e6 e8 8d 4d 0b 00 45 85 e4
RSP: 0018:ffffc90001a6fa00 EFLAGS: 00000246
RAX: 0000000000040000 RBX: 1ffff9200034df44 RCX: ffffc9000b507000
RDX: 0000000000040000 RSI: ffffffff8169181e RDI: 0000000000000003
RBP: ffffc90001a6fad0 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff81691833 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000008
 smp_call_function_many_cond+0x25f/0x9d0 kernel/smp.c:894
 smp_call_function_many kernel/smp.c:967 [inline]
 smp_call_function kernel/smp.c:989 [inline]
 on_each_cpu+0x4a/0x140 kernel/smp.c:1088
 clock_was_set+0x18/0x20 kernel/time/hrtimer.c:889
 timekeeping_inject_offset+0x4af/0x620 kernel/time/timekeeping.c:1374
 do_adjtimex+0x28f/0xa30 kernel/time/timekeeping.c:2405
 do_clock_adjtime kernel/time/posix-timers.c:1109 [inline]
 __do_sys_clock_adjtime+0x163/0x270 kernel/time/posix-timers.c:1121
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665f9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1f5f098188 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665f9
RDX: 0000000000000000 RSI: 0000000020000400 RDI: 0000000000000000
RBP: 00000000004bfce1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffdf97ad2ff R14: 00007f1f5f098300 R15: 0000000000022000
Crashes (1):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci-upstream-kasan-gce-root	2021/04/29 16:16	upstream	d72cd4ad4174	77e2b668	.config	log	report			info	INFO: rcu detected stall in newfstat