syzbot

 sign-in | mailing list | source | docs
🐞 Open [1032] ≡ Subsystems 🐞 Fixed [5264] 🐞 Invalid [12583] ⬇ Missing Backports [85] 📈 Kernel Health 📈 Bug Lifetimes 📈 Fuzzing 📈 Crashes 💬 Send us feedback

INFO: rcu detected stall in clone (3)

Status: auto-obsoleted due to no activity on 2022/10/31 19:01
Subsystems: kernel
[Documentation on labels]
First crash: 741d, last: 643d
▶ ▼ Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in clone (2) kernel 14 822d 1128d 0/26 closed as invalid on 2022/02/08 10:00
upstream INFO: rcu detected stall in clone bpf 2 1257d 1266d 0/26 auto-closed as invalid on 2021/02/24 09:47

Sample crash report:
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=2cd/1/0x4000000000000000 softirq=137414/137414 fqs=0 
	(detected by 1, t=10502 jiffies, g=211777, q=584 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3628 Comm: syz-executor.3 Not tainted 5.19.0-rc4-syzkaller-00036-gd9b2ba67917c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:rcu_rdp_cpu_online kernel/rcu/tree.c:232 [inline]
RIP: 0010:rcu_lockdep_current_cpu_online kernel/rcu/tree.c:1193 [inline]
RIP: 0010:rcu_lockdep_current_cpu_online+0x83/0x140 kernel/rcu/tree.c:1177
Code: 3c 02 00 0f 85 a4 00 00 00 48 03 1c ed e0 88 7f 8b 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 20 48 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 87 00 00 00 48 8d 7b 18 48 8b 6b 20 48 b8 00 00 00 00 00 fc
RSP: 0018:ffffc90000007ce0 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: ffff8880b9a3ae40 RCX: ffffffff815d7d71
RDX: 1ffff110173475cc RSI: 0000000000010003 RDI: ffff8880b9a3ae60
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8dbae417
R10: fffffbfff1b75c82 R11: 0000000000000001 R12: 0000000000000001
R13: 17b9f2d52f73e5aa R14: ffff8880720de3a0 R15: 17b9f2d52f73e5aa
FS:  0000555556769400(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f82b8cd53a5 CR3: 000000005a084000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 000000000000003b DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rcu_read_lock_held_common kernel/rcu/update.c:112 [inline]
 rcu_read_lock_held_common kernel/rcu/update.c:102 [inline]
 rcu_read_lock_sched_held+0x25/0x70 kernel/rcu/update.c:123
 trace_lock_release include/trace/events/lock.h:69 [inline]
 lock_release+0x560/0x780 kernel/locking/lockdep.c:5676
 rcu_lock_release include/linux/rcupdate.h:274 [inline]
 rcu_read_unlock include/linux/rcupdate.h:728 [inline]
 advance_sched+0x507/0x9a0 net/sched/sch_taprio.c:770
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1112
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:rcu_lockdep_current_cpu_online+0xde/0x140 kernel/rcu/tree.c:1197
Code: 5b 18 48 8d 7b 70 48 89 fa 48 c1 ea 03 80 3c 02 00 75 5a 48 8b 53 70 b8 01 00 00 00 48 85 d5 74 0c 65 ff 0d 84 1e 9e 7e 74 21 <5b> 5d c3 be 04 00 00 00 48 c7 c7 00 e0 d8 8b e8 2e 6d 61 00 8b 05
RSP: 0018:ffffc900031078a8 EFLAGS: 00000282
RAX: 0000000000000001 RBX: ffffffff8bd8d780 RCX: ffffffff815d8508
RDX: 0000000000000003 RSI: 0000000000000002 RDI: ffffffff8bd8d7f0
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8dbae417
R10: fffffbfff1b75c82 R11: 000000000008a07a R12: 0000000000000001
R13: 0000000000000000 R14: ffffffff8bd83b60 R15: 0000000000000000
 rcu_read_lock_held_common kernel/rcu/update.c:112 [inline]
 rcu_read_lock_held_common kernel/rcu/update.c:102 [inline]
 rcu_read_lock_sched_held+0x25/0x70 kernel/rcu/update.c:123
 trace_lock_acquire include/trace/events/lock.h:24 [inline]
 lock_acquire+0x480/0x570 kernel/locking/lockdep.c:5636
 rcu_lock_acquire include/linux/rcupdate.h:269 [inline]
 rcu_read_lock include/linux/rcupdate.h:695 [inline]
 percpu_ref_get_many include/linux/percpu-refcount.h:202 [inline]
 percpu_ref_get include/linux/percpu-refcount.h:222 [inline]
 obj_cgroup_get include/linux/memcontrol.h:801 [inline]
 memcg_slab_post_alloc_hook+0x114/0x430 mm/slab.h:539
 slab_post_alloc_hook mm/slab.h:757 [inline]
 slab_alloc mm/slab.c:3302 [inline]
 __kmem_cache_alloc_lru mm/slab.c:3479 [inline]
 kmem_cache_alloc+0x1d9/0x560 mm/slab.c:3499
 dup_mm+0x8a/0x1390 kernel/fork.c:1515
 copy_mm kernel/fork.c:1576 [inline]
 copy_process+0x3bba/0x7020 kernel/fork.c:2240
 kernel_clone+0xe7/0xab0 kernel/fork.c:2655
 __do_sys_clone+0xba/0x100 kernel/fork.c:2789
 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+0x46/0xb0
RIP: 0033:0x7f82b7c876fb
Code: ed 0f 85 60 01 00 00 64 4c 8b 0c 25 10 00 00 00 45 31 c0 4d 8d 91 d0 02 00 00 31 d2 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 89 00 00 00 41 89 c5 85 c0 0f 85 90 00 00
RSP: 002b:00007ffdcce749e0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f82b7c876fb
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000555556769400
R10: 00005555567696d0 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffdcce74ac0
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g211777 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=93503
rcu: rcu_preempt kthread starved for 10502 jiffies! g211777 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:28320 pid:   16 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5146 [inline]
 __schedule+0xa00/0x4b50 kernel/sched/core.c:6458
 schedule+0xd2/0x1f0 kernel/sched/core.c:6530
 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1935
 rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1999
 rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2187
 kthread+0x2e9/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3628 Comm: syz-executor.3 Not tainted 5.19.0-rc4-syzkaller-00036-gd9b2ba67917c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:_raw_spin_lock_irq+0x0/0x50 kernel/locking/spinlock.c:169
Code: 18 45 31 c9 31 c9 ff 74 24 08 41 b8 01 00 00 00 31 d2 31 f6 e8 81 a6 e3 f7 48 89 ef 58 5d e9 e7 1b e4 f7 0f 1f 80 00 00 00 00 <55> 48 89 fd 9c 58 fa f6 c4 02 75 30 bf 01 00 00 00 e8 8a 41 d7 f7
RSP: 0018:ffffc90000007e38 EFLAGS: 00000046
RAX: 0000000080010001 RBX: ffff88801d137340 RCX: 0000000000000000
RDX: ffff88807e84c1c0 RSI: ffffffff8169d33b RDI: ffff8880b9a2a500
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: ffff8880b9a2a600 R14: ffff8880b9a2a500 R15: 0000000000000001
FS:  0000555556769400(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f82b8cd53a5 CR3: 000000005a084000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 000000000000003b DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __run_hrtimer kernel/time/hrtimer.c:1689 [inline]
 __hrtimer_run_queues+0x243/0xe50 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1112
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:rcu_lockdep_current_cpu_online+0xde/0x140 kernel/rcu/tree.c:1197
Code: 5b 18 48 8d 7b 70 48 89 fa 48 c1 ea 03 80 3c 02 00 75 5a 48 8b 53 70 b8 01 00 00 00 48 85 d5 74 0c 65 ff 0d 84 1e 9e 7e 74 21 <5b> 5d c3 be 04 00 00 00 48 c7 c7 00 e0 d8 8b e8 2e 6d 61 00 8b 05
RSP: 0018:ffffc900031078a8 EFLAGS: 00000282
RAX: 0000000000000001 RBX: ffffffff8bd8d780 RCX: ffffffff815d8508
RDX: 0000000000000003 RSI: 0000000000000002 RDI: ffffffff8bd8d7f0
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8dbae417
R10: fffffbfff1b75c82 R11: 000000000008a07a R12: 0000000000000001
R13: 0000000000000000 R14: ffffffff8bd83b60 R15: 0000000000000000
 rcu_read_lock_held_common kernel/rcu/update.c:112 [inline]
 rcu_read_lock_held_common kernel/rcu/update.c:102 [inline]
 rcu_read_lock_sched_held+0x25/0x70 kernel/rcu/update.c:123
 trace_lock_acquire include/trace/events/lock.h:24 [inline]
 lock_acquire+0x480/0x570 kernel/locking/lockdep.c:5636
 rcu_lock_acquire include/linux/rcupdate.h:269 [inline]
 rcu_read_lock include/linux/rcupdate.h:695 [inline]
 percpu_ref_get_many include/linux/percpu-refcount.h:202 [inline]
 percpu_ref_get include/linux/percpu-refcount.h:222 [inline]
 obj_cgroup_get include/linux/memcontrol.h:801 [inline]
 memcg_slab_post_alloc_hook+0x114/0x430 mm/slab.h:539
 slab_post_alloc_hook mm/slab.h:757 [inline]
 slab_alloc mm/slab.c:3302 [inline]
 __kmem_cache_alloc_lru mm/slab.c:3479 [inline]
 kmem_cache_alloc+0x1d9/0x560 mm/slab.c:3499
 dup_mm+0x8a/0x1390 kernel/fork.c:1515
 copy_mm kernel/fork.c:1576 [inline]
 copy_process+0x3bba/0x7020 kernel/fork.c:2240
 kernel_clone+0xe7/0xab0 kernel/fork.c:2655
 __do_sys_clone+0xba/0x100 kernel/fork.c:2789
 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+0x46/0xb0
RIP: 0033:0x7f82b7c876fb
Code: ed 0f 85 60 01 00 00 64 4c 8b 0c 25 10 00 00 00 45 31 c0 4d 8d 91 d0 02 00 00 31 d2 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 89 00 00 00 41 89 c5 85 c0 0f 85 90 00 00
RSP: 002b:00007ffdcce749e0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f82b7c876fb
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000555556769400
R10: 00005555567696d0 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffdcce74ac0
 </TASK>
----------------
Code disassembly (best guess):
   0:	3c 02                	cmp    $0x2,%al
   2:	00 0f                	add    %cl,(%rdi)
   4:	85 a4 00 00 00 48 03 	test   %esp,0x3480000(%rax,%rax,1)
   b:	1c ed                	sbb    $0xed,%al
   d:	e0 88                	loopne 0xffffff97
   f:	7f 8b                	jg     0xffffff9c
  11:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  18:	fc ff df
  1b:	48 8d 7b 20          	lea    0x20(%rbx),%rdi
  1f:	48 89 fa             	mov    %rdi,%rdx
  22:	48 c1 ea 03          	shr    $0x3,%rdx
  26:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
* 2a:	0f 85 87 00 00 00    	jne    0xb7 <-- trapping instruction
  30:	48 8d 7b 18          	lea    0x18(%rbx),%rdi
  34:	48 8b 6b 20          	mov    0x20(%rbx),%rbp
  38:	48                   	rex.W
  39:	b8 00 00 00 00       	mov    $0x0,%eax
  3e:	00 fc                	add    %bh,%ah

Crashes (7):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/06/29 18:06 upstream d9b2ba67917c 1434eec0 .config console log report info ci-upstream-kasan-gce-selinux-root INFO: rcu detected stall in clone
2022/06/14 07:17 upstream b13baccc3850 0f087040 .config console log report info ci-upstream-kasan-gce-selinux-root INFO: rcu detected stall in clone
2022/06/13 14:39 upstream b13baccc3850 0d5abf15 .config console log report info ci-upstream-kasan-gce-selinux-root INFO: rcu detected stall in clone
2022/04/30 04:12 upstream 8013d1d3d2e3 ad6b95d8 .config console log report info ci-upstream-kasan-gce-selinux-root INFO: rcu detected stall in clone
2022/06/26 00:37 net-old 3b89b511ea0c a371c43c .config console log report info ci-upstream-net-this-kasan-gce INFO: rcu detected stall in clone
2022/08/02 18:53 linux-next cb71b93c2dc3 1c9013ac .config console log report info ci-upstream-linux-next-kasan-gce-root INFO: rcu detected stall in clone
2022/04/26 09:33 linux-next e7d6987e09a3 1fa34c1b .config console log report info ci-upstream-linux-next-kasan-gce-root INFO: rcu detected stall in clone
* Struck through repros no longer work on HEAD.