INFO: rcu detected stall in sock_close

Status: auto-obsoleted due to no activity on 2023/11/07 13:02
Reported-by: syzbot+f1052a30adc283ebf745@syzkaller.appspotmail.com
First crash: 1199d, last: 1145d
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (1)
Date Name Commit Repro Result
2023/09/05 upstream (ToT) 3f86ed6ec0b3 C Didn't crash
▶ ▼ Similar bugs (16)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 INFO: rcu detected stall in sock_close (2) 1 1 967d 967d 0/3 auto-obsoleted due to no activity on 2024/05/03 14:38
upstream INFO: rcu detected stall in sock_close (4) net 1 2 1057d 1095d 0/29 auto-obsoleted due to no activity on 2024/01/24 15:51
linux-6.1 INFO: rcu detected stall in sock_close (3) 1 1 858d 858d 0/3 auto-obsoleted due to no activity on 2024/08/21 03:02
linux-6.1 INFO: rcu detected stall in sock_close origin:upstream 1 syz, C done 1 1166d 1166d 3/3 fixed on 2023/09/23 10:26
upstream INFO: rcu detected stall in sock_close cgroups mm 1 6 2479d 2480d 0/29 closed as invalid on 2019/12/04 14:04
linux-6.1 INFO: rcu detected stall in sock_close (2) 1 1 960d 960d 0/3 auto-obsoleted due to no activity on 2024/05/11 05:25
upstream INFO: rcu detected stall in sock_close (3) tipc 1 syz, C done done 5 1767d 2262d 0/29 closed as invalid on 2022/02/08 10:42
linux-6.6 INFO: rcu detected stall in sock_close (2) origin:upstream 1 syz 1 20d 126d 0/2 upstream: reported syz repro on 2026/05/15 05:06
linux-5.15 INFO: rcu detected stall in sock_close (3) origin:upstream 1 syz, C error 20 20h05m 851d 0/3 upstream: reported C repro on 2024/05/20 00:06
upstream INFO: rcu detected stall in sock_close (2) cgroups mm 1 1 2444d 2444d 0/29 closed as invalid on 2020/01/09 08:13
upstream INFO: rcu detected stall in sock_close (5) prio:normal tipc 1 syz, C error error 91 53d 428d 0/29 upstream: reported C repro on 2025/07/16 17:01
linux-6.1 BUG: soft lockup in sock_close origin:lts-only 1 syz, C inconclusive 9 4d00h 633d 0/3 upstream: reported C repro on 2024/12/23 18:51
linux-6.6 INFO: rcu detected stall in sock_close 1 syz error 2 305d 388d 0/2 auto-obsoleted due to no activity on 2026/02/24 12:42
android-5-10 BUG: soft lockup in sock_close 1 syz, C 196 5d01h 907d 0/2 upstream: reported C repro on 2024/03/25 07:28
android-5-15 BUG: soft lockup in sock_close origin:downstream 1 syz, C done 385 15d 905d 0/2 upstream: reported C repro on 2024/03/26 23:21
android-6-1 BUG: soft lockup in sock_close origin:downstream 1 syz, C error 17 6d18h 905d 0/2 upstream: reported C repro on 2024/03/27 04:09
▶ ▼ Fix bisection attempts (2)
Created Duration User Patch Repo Result
2023/09/30 00:37 0m bisect fix linux-5.15.y error job log
2023/07/11 14:41 3h05m bisect fix linux-5.15.y OK (0) job log log

Sample crash report:
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (1 GPs behind) idle=1e5/1/0x4000000000000000 softirq=5086/5088 fqs=0 
	(t=18746 jiffies g=4817 q=141)
rcu: rcu_preempt kthread starved for 18746 jiffies! g4817 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:I stack:27000 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5026 [inline]
 __schedule+0x12c4/0x4590 kernel/sched/core.c:6372
 schedule+0x11b/0x1f0 kernel/sched/core.c:6455
 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1884
 rcu_gp_fqs_loop+0x2af/0xf70 kernel/rcu/tree.c:1959
 rcu_gp_kthread+0xa4/0x360 kernel/rcu/tree.c:2132
 kthread+0x3f6/0x4f0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
 </TASK>
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: 2925 Comm: kworker/1:3 Not tainted 5.15.115-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
Workqueue: events_power_efficient gc_worker
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:101 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x5c/0x290 mm/kasan/generic.c:189
Code: fb 48 c1 eb 03 49 b8 00 00 00 00 00 fc ff df 4e 8d 0c 03 4c 8d 54 37 ff 49 c1 ea 03 49 bb 01 00 00 00 00 fc ff df 4f 8d 34 1a <4c> 89 f5 4c 29 cd 48 83 fd 10 7f 26 48 85 ed 0f 84 3a 01 00 00 49
RSP: 0018:ffffc9000bc4f878 EFLAGS: 00000803
RAX: 0000000000000001 RBX: 1ffffffff1f79232 RCX: ffffffff8162834f
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8fbc9190
RBP: 000000000001ffff R08: dffffc0000000000 R09: fffffbfff1f79232
R10: 1ffffffff1f79232 R11: dffffc0000000001 R12: 0000000000000002
R13: ffff888024a66428 R14: fffffbfff1f79233 R15: ffff888024a664a0
FS:  0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555561562c0 CR3: 0000000016dd4000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 instrument_atomic_read include/linux/instrumented.h:71 [inline]
 test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline]
 hlock_class kernel/locking/lockdep.c:197 [inline]
 __lock_acquire+0xfaf/0x1ff0 kernel/locking/lockdep.c:5007
 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622
 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:269
 rcu_read_lock include/linux/rcupdate.h:696 [inline]
 gc_worker+0x289/0x14b0 net/netfilter/nf_conntrack_core.c:1470
 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2307
 worker_thread+0xaca/0x1280 kernel/workqueue.c:2454
 kthread+0x3f6/0x4f0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.241 msecs
NMI backtrace for cpu 0
CPU: 0 PID: 3530 Comm: syz-executor233 Not tainted 5.15.115-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
 rcu_dump_cpu_stacks+0x223/0x390 kernel/rcu/tree_stall.h:343
 print_cpu_stall kernel/rcu/tree_stall.h:627 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:711 [inline]
 rcu_pending kernel/rcu/tree.c:3888 [inline]
 rcu_sched_clock_irq+0xf26/0x1770 kernel/rcu/tree.c:2606
 update_process_times+0x196/0x200 kernel/time/timer.c:1788
 tick_sched_handle kernel/time/tick-sched.c:226 [inline]
 tick_sched_timer+0x22d/0x3c0 kernel/time/tick-sched.c:1430
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x55b/0xcf0 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline]
 __sysvec_apic_timer_interrupt+0x139/0x470 arch/x86/kernel/apic/apic.c:1102
 sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1096
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xd4/0x130 kernel/locking/spinlock.c:194
Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 12 2b a5 f7 f6 44 24 21 02 75 4e 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> c7 fa 32 f7 65 8b 05 c8 46 de 75 85 c0 74 3f 48 c7 04 24 0e 36
RSP: 0018:ffffc90002c2f860 EFLAGS: 00000206
RAX: f8a5bbe3c21b4c00 RBX: 1ffff92000585f10 RCX: ffffffff8162db08
RDX: dffffc0000000000 RSI: ffffffff8a8afc60 RDI: 0000000000000001
RBP: ffffc90002c2f8f0 R08: dffffc0000000000 R09: fffffbfff1f79223
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: 1ffff92000585f0c R14: ffffc90002c2f880 R15: 0000000000000246
 synchronize_rcu_expedited+0x3ea/0x740 kernel/rcu/tree_exp.h:852
 synchronize_rcu+0x107/0x1a0 kernel/rcu/tree.c:3754
 packet_release+0x982/0xc40 net/packet/af_packet.c:3122
 __sock_release net/socket.c:649 [inline]
 sock_close+0xcd/0x230 net/socket.c:1317
 __fput+0x3bf/0x890 fs/file_table.c:280
 task_work_run+0x129/0x1a0 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:175
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x5d/0x250 kernel/entry/common.c:301
 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fe00331b053
Code: c7 c2 c0 ff ff ff f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb ba 0f 1f 00 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8
RSP: 002b:00007ffe6bab6c28 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00007fe00331b053
RDX: 00007fe0033594e9 RSI: 0000000020000040 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000000000d R09: 000000000000000d
R10: 000000000000000d R11: 0000000000000246 R12: 00007ffe6bab6c40
R13: 00000000000f4240 R14: 0000000000000000 R15: 0000000000000000
 </TASK>

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/06/06 14:13 linux-5.15.y d7af3e5ba454 a4ae4f42 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: rcu detected stall in sock_close
2023/07/30 13:01 linux-5.15.y 09996673e313 92476829 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 INFO: rcu detected stall in sock_close
* Struck through repros no longer work on HEAD.