syzbot


INFO: rcu detected stall in sys_socket (5)

Status: auto-closed as invalid on 2022/01/06 01:08
Subsystems: net
[Documentation on labels]
First crash: 949d, last: 923d
Similar bugs (12)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in sys_socket (4) fs 1 1086d 1086d 0/26 auto-closed as invalid on 2021/07/27 17:27
linux-5.15 INFO: rcu detected stall in sys_socket 1 198d 198d 0/3 auto-obsoleted due to no activity on 2024/01/11 06:48
upstream INFO: rcu detected stall in sys_socket kernel 11 1597d 1598d 0/26 closed as invalid on 2019/12/04 14:04
linux-4.19 INFO: rcu detected stall in sys_socket 1 727d 727d 0/1 auto-closed as invalid on 2022/08/20 07:08
upstream INFO: rcu detected stall in sys_socket (10) net apparmor C done 6 5d00h 140d 0/26 upstream: reported C repro on 2023/11/30 15:24
upstream INFO: rcu detected stall in sys_socket (6) cgroups mm 2 582d 626d 0/26 auto-obsoleted due to no activity on 2022/12/12 22:48
upstream INFO: rcu detected stall in sys_socket (7) kernel 2 442d 474d 0/26 auto-obsoleted due to no activity on 2023/05/02 14:50
upstream INFO: rcu detected stall in sys_socket (9) kasan mm 2 259d 269d 0/26 closed as invalid on 2023/09/07 14:25
upstream INFO: rcu detected stall in sys_socket (2) kernel 3 1562d 1562d 0/26 closed as invalid on 2020/01/08 05:23
linux-5.15 INFO: rcu detected stall in sys_socket (2) origin:upstream C 2 8d06h 47d 0/3 upstream: reported C repro on 2024/03/02 17:55
upstream INFO: rcu detected stall in sys_socket (3) kernel 4 1562d 1562d 0/26 closed as invalid on 2020/01/09 08:13
android-5-15 BUG: soft lockup in sys_socket origin:lts C 6 2d01h 8d04h 0/2 upstream: reported C repro on 2024/04/10 16:23

Sample crash report:
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=3ed/1/0x4000000000000000 softirq=33374/33374 fqs=4 
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P2971/1:b..l P18574/1:b..l
	(detected by 1, t=10502 jiffies, g=50117, q=44)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3055 Comm: systemd-timesyn Not tainted 5.15.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:instrument_atomic_read include/linux/instrumented.h:71 [inline]
RIP: 0010:test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline]
RIP: 0010:hlock_class kernel/locking/lockdep.c:199 [inline]
RIP: 0010:__lock_acquire+0x12ee/0x2b00 kernel/locking/lockdep.c:5012
Code: 44 24 38 8a 04 38 84 c0 0f 85 2b 12 00 00 48 8b 44 24 20 8b 18 81 e3 ff 1f 00 00 48 89 d8 48 c1 e8 06 48 8d 3c c5 00 8e d1 8f <be> 08 00 00 00 e8 f8 ce 69 00 48 0f a3 1d a0 7b 6d 0e 72 32 48 c7
RSP: 0018:ffffc90000007980 EFLAGS: 00000007
RAX: 000000000000002d RBX: 0000000000000b75 RCX: ffffffff81640fc0
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8fd18f68
RBP: ffffc90000007ad0 R08: dffffc0000000000 R09: fffffbfff1fa31c3
R10: fffffbfff1fa31c3 R11: 0000000000000000 R12: ffff88801a6a0000
R13: ffff88801a6a0a20 R14: ffffffff8f6673e0 R15: 960d9c1b3bb0c0bd
FS:  00007f872cba68c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8fbe68f018 CR3: 000000001faa6000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5625
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:363 [inline]
 advance_sched+0x4c/0x930 net/sched/sch_taprio.c:710
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x50b/0xa60 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x3b3/0x1040 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
 __sysvec_apic_timer_interrupt+0xf9/0x270 arch/x86/kernel/apic/apic.c:1103
 sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20
RIP: 0010:lock_acquire+0x21f/0x4d0 kernel/locking/lockdep.c:5629
Code: 08 4c 89 f7 e8 b2 e4 69 00 f6 84 24 81 00 00 00 02 0f 85 13 02 00 00 41 f7 c4 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 04 2f 00 00 00 00 43 c7 44 2f 09 00 00 00 00 43 c7 44 2f 11
RSP: 0018:ffffc900012dfbc0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff9200025bf88 RCX: ffff88801a6a09f0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900012dfd18 R08: dffffc0000000000 R09: fffffbfff1fa31c3
R10: fffffbfff1fa31c3 R11: 0000000000000000 R12: 0000000000000246
R13: 1ffff9200025bf80 R14: ffffc900012dfc40 R15: dffffc0000000000
 __fs_reclaim_acquire mm/page_alloc.c:4539 [inline]
 fs_reclaim_acquire+0x77/0x110 mm/page_alloc.c:4553
 might_alloc include/linux/sched/mm.h:198 [inline]
 slab_pre_alloc_hook mm/slab.h:492 [inline]
 slab_alloc_node mm/slub.c:3120 [inline]
 slab_alloc mm/slub.c:3214 [inline]
 kmem_cache_alloc+0x43/0x300 mm/slub.c:3219
 sock_alloc_inode+0x17/0xb0 net/socket.c:303
 alloc_inode fs/inode.c:237 [inline]
 new_inode_pseudo+0x61/0x220 fs/inode.c:938
 sock_alloc net/socket.c:626 [inline]
 __sock_create+0x12b/0x8d0 net/socket.c:1428
 sock_create net/socket.c:1515 [inline]
 __sys_socket+0x133/0x380 net/socket.c:1557
 __do_sys_socket net/socket.c:1566 [inline]
 __se_sys_socket net/socket.c:1564 [inline]
 __x64_sys_socket+0x76/0x80 net/socket.c:1564
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f872bf9bf17
Code: 73 01 c3 48 8b 0d 81 ef 2a 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 29 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 51 ef 2a 00 f7 d8 64 89 01 48
RSP: 002b:00007fff360e58a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 0000563fbc56e630 RCX: 00007f872bf9bf17
RDX: 0000000000000000 RSI: 0000000000080002 RDI: 0000000000000002
RBP: 00007fff360e58c0 R08: 0000563fbc2dc260 R09: 00000000ffffffff
R10: 00007fff360e58dc R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff360e58f0 R14: 0000000000000066 R15: 0000000000000000
task:syz-executor.4  state:R  running task     stack:26768 pid:18574 ppid:  6926 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:4940 [inline]
 __schedule+0xc8d/0x1270 kernel/sched/core.c:6287
 preempt_schedule_common kernel/sched/core.c:6459 [inline]
 preempt_schedule+0x14d/0x190 kernel/sched/core.c:6484
 preempt_schedule_thunk+0x16/0x18
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
 _raw_spin_unlock_irqrestore+0x128/0x130 kernel/locking/spinlock.c:194
 spin_unlock_irqrestore include/linux/spinlock.h:418 [inline]
 timerfd_clock_was_set+0x1d3/0x2b0 fs/timerfd.c:113
 clock_was_set+0x8a0/0x940 kernel/time/hrtimer.c:980
 do_settimeofday64+0x618/0x7a0 kernel/time/timekeeping.c:1327
 __do_sys_clock_settime kernel/time/posix-timers.c:1079 [inline]
 __se_sys_clock_settime kernel/time/posix-timers.c:1067 [inline]
 __x64_sys_clock_settime+0x23d/0x280 kernel/time/posix-timers.c:1067
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f8fbe58a8d9
RSP: 002b:00007f8fbbb01188 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3
RAX: ffffffffffffffda RBX: 00007f8fbe68ef60 RCX: 00007f8fbe58a8d9
RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000000
RBP: 00007f8fbe5e4cb4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd6104377f R14: 00007f8fbbb01300 R15: 0000000000022000
task:systemd-udevd   state:R  running task     stack:19728 pid: 2971 ppid:     1 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:4940 [inline]
 __schedule+0xc8d/0x1270 kernel/sched/core.c:6287
 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6687
 irqentry_exit+0x56/0x90 kernel/entry/common.c:425
 asm_sysvec_apic_timer_interrupt+0x12/0x20
RIP: 0010:lock_acquire+0x21f/0x4d0 kernel/locking/lockdep.c:5629
Code: 08 4c 89 f7 e8 b2 e4 69 00 f6 84 24 81 00 00 00 02 0f 85 13 02 00 00 41 f7 c4 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 04 2f 00 00 00 00 43 c7 44 2f 09 00 00 00 00 43 c7 44 2f 11
RSP: 0018:ffffc9000225f740 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff9200044bef8 RCX: ffff88801a6a5f70
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000225f898 R08: dffffc0000000000 R09: fffffbfff1fa31c1
R10: fffffbfff1fa31c1 R11: 0000000000000000 R12: 0000000000000246
R13: 1ffff9200044bef0 R14: ffffc9000225f7c0 R15: dffffc0000000000
 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:267
 rcu_read_lock include/linux/rcupdate.h:687 [inline]
 dput+0x58/0x6e0 fs/dcache.c:874
 path_put fs/namei.c:557 [inline]
 terminate_walk+0x3dc/0x570 fs/namei.c:676
 path_lookupat+0x371/0x6c0 fs/namei.c:2466
 filename_lookup+0x270/0x640 fs/namei.c:2478
 user_path_at_empty+0x40/0x1a0 fs/namei.c:2801
 user_path_at include/linux/namei.h:57 [inline]
 vfs_statx+0x10a/0x3f0 fs/stat.c:221
 vfs_fstatat fs/stat.c:243 [inline]
 vfs_lstat include/linux/fs.h:3356 [inline]
 __do_sys_newlstat fs/stat.c:398 [inline]
 __se_sys_newlstat+0xba/0x750 fs/stat.c:392
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fc02ea9c335
RSP: 002b:00007fff16e3cf68 EFLAGS: 00000246 ORIG_RAX: 0000000000000006
RAX: ffffffffffffffda RBX: 000055c34659fb40 RCX: 00007fc02ea9c335
RDX: 00007fff16e3cfa0 RSI: 00007fff16e3cfa0 RDI: 000055c34659eb40
RBP: 00007fff16e3d060 R08: 00007fc02ed5b228 R09: 0000000000001010
R10: 00007fc02ed5ab58 R11: 0000000000000246 R12: 000055c34659eb40
R13: 000055c34659eb5a R14: 000055c3465aefd5 R15: 000055c3465aefda
rcu: rcu_preempt kthread starved for 10494 jiffies! g50117 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:R  running task     stack:26296 pid:   14 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:4940 [inline]
 __schedule+0xc8d/0x1270 kernel/sched/core.c:6287
 schedule+0x14b/0x210 kernel/sched/core.c:6366
 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1881
 rcu_gp_fqs_loop+0x1fd/0x770 kernel/rcu/tree.c:1957
 rcu_gp_kthread+0xa5/0x350 kernel/rcu/tree.c:2130
 kthread+0x453/0x480 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 1
CPU: 1 PID: 10968 Comm: kworker/u4:7 Not tainted 5.15.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound toggle_allocation_gate
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1dc/0x2d8 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x45f/0x490 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_check_gp_kthread_starvation+0x1ff/0x270 kernel/rcu/tree_stall.h:481
 print_other_cpu_stall kernel/rcu/tree_stall.h:586 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:729 [inline]
 rcu_pending kernel/rcu/tree.c:3880 [inline]
 rcu_sched_clock_irq+0x23d5/0x2bc0 kernel/rcu/tree.c:2599
 update_process_times+0x197/0x200 kernel/time/timer.c:1785
 tick_sched_handle kernel/time/tick-sched.c:226 [inline]
 tick_sched_timer+0x27d/0x420 kernel/time/tick-sched.c:1421
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x4cb/0xa60 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x3b3/0x1040 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
 __sysvec_apic_timer_interrupt+0xf9/0x270 arch/x86/kernel/apic/apic.c:1103
 sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20
RIP: 0010:csd_lock_wait kernel/smp.c:440 [inline]
RIP: 0010:smp_call_function_many_cond+0xbb7/0xda0 kernel/smp.c:969
Code: e8 ae 9f 0b 00 41 83 e7 01 49 bf 00 00 00 00 00 fc ff df 75 0e e8 89 9b 0b 00 eb 4c 0f 1f 80 00 00 00 00 f3 90 42 0f b6 04 3b <84> c0 75 11 41 f7 45 00 01 00 00 00 74 2b e8 66 9b 0b 00 eb e4 44
RSP: 0018:ffffc900187bf820 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 1ffff11017387305 RCX: ffff888022f30000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900187bf960 R08: ffffffff8176d702 R09: ffffffff843540e0
R10: 0000000000000009 R11: ffff888022f30000 R12: 0000000000000000
R13: ffff8880b9c39828 R14: ffff8880b9d325c0 R15: dffffc0000000000
 on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1135
 on_each_cpu include/linux/smp.h:71 [inline]
 text_poke_sync arch/x86/kernel/alternative.c:929 [inline]
 text_poke_bp_batch+0x310/0x940 arch/x86/kernel/alternative.c:1114
 text_poke_flush arch/x86/kernel/alternative.c:1268 [inline]
 text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1275
 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146
 static_key_enable_cpuslocked+0x12d/0x250 kernel/jump_label.c:177
 static_key_enable+0x16/0x20 kernel/jump_label.c:190
 toggle_allocation_gate+0xbf/0x460 mm/kfence/core.c:626
 process_one_work+0x853/0x1140 kernel/workqueue.c:2297
 worker_thread+0xac1/0x1320 kernel/workqueue.c:2444
 kthread+0x453/0x480 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30
----------------
Code disassembly (best guess):
   0:	44 24 38             	rex.R and $0x38,%al
   3:	8a 04 38             	mov    (%rax,%rdi,1),%al
   6:	84 c0                	test   %al,%al
   8:	0f 85 2b 12 00 00    	jne    0x1239
   e:	48 8b 44 24 20       	mov    0x20(%rsp),%rax
  13:	8b 18                	mov    (%rax),%ebx
  15:	81 e3 ff 1f 00 00    	and    $0x1fff,%ebx
  1b:	48 89 d8             	mov    %rbx,%rax
  1e:	48 c1 e8 06          	shr    $0x6,%rax
  22:	48 8d 3c c5 00 8e d1 	lea    -0x702e7200(,%rax,8),%rdi
  29:	8f
* 2a:	be 08 00 00 00       	mov    $0x8,%esi <-- trapping instruction
  2f:	e8 f8 ce 69 00       	callq  0x69cf2c
  34:	48 0f a3 1d a0 7b 6d 	bt     %rbx,0xe6d7ba0(%rip)        # 0xe6d7bdc
  3b:	0e
  3c:	72 32                	jb     0x70
  3e:	48                   	rex.W
  3f:	c7                   	.byte 0xc7

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/10/08 00:59 upstream 4a16df549d23 efe0f24d .config console log report info ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in sys_socket
2021/09/12 15:02 linux-next aa14a3016182 5ae8508a .config console log report info ci-upstream-linux-next-kasan-gce-root INFO: rcu detected stall in sys_socket
* Struck through repros no longer work on HEAD.