syzbot


INFO: rcu detected stall in security_socket_connect

Status: closed as invalid on 2022/02/08 10:10
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 341d, last: 341d

Sample crash report:
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=895/1/0x4000000000000000 softirq=22994/22996 fqs=0 
	(detected by 0, t=10502 jiffies, g=31101, q=52)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 7667 Comm: syz-executor.0 Not tainted 5.16.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:mark_lock+0x151/0x17b0 kernel/locking/lockdep.c:4566
Code: 12 00 00 48 89 ee 48 23 70 50 41 ba 01 00 00 00 0f 84 79 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 01 c3 48 c7 03 00 00 00 00 <c7> 43 08 00 00 00 00 48 c7 43 10 00 00 00 00 48 8b 84 24 10 01 00
RSP: 0018:ffffc90000dc0ab0 EFLAGS: 00000082
RAX: dffffc0000000000 RBX: fffff520001b815d RCX: 1ffffffff1fef60e
RDX: dffffc0000000000 RSI: 0000000000000100 RDI: ffffffff8ff7b070
RBP: 0000000000000100 R08: 0000000000000000 R09: ffffffff8ff76a0f
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000008
R13: ffff88804d3a44b0 R14: 0000000000000058 R15: ffff88804d3a44d0
FS:  00007f8181ec5700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e124000 CR3: 0000000022361000 CR4: 0000000000350ee0
Call Trace:
 <IRQ>
 mark_usage kernel/locking/lockdep.c:4526 [inline]
 __lock_acquire+0x8a7/0x54a0 kernel/locking/lockdep.c:4981
 lock_acquire kernel/locking/lockdep.c:5637 [inline]
 lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
 _raw_spin_lock_irq+0x32/0x50 kernel/locking/spinlock.c:170
 __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: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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0xc/0x70 kernel/kcov.c:286
Code: 00 00 00 48 89 7c 30 e8 48 89 4c 30 f0 4c 89 54 d8 20 48 89 10 5b c3 0f 1f 80 00 00 00 00 41 89 f8 bf 03 00 00 00 4c 8b 14 24 <89> f1 65 48 8b 34 25 40 70 02 00 e8 14 f9 ff ff 84 c0 74 4b 48 8b
RSP: 0018:ffffc900105af540 EFLAGS: 00000202
RAX: 0000000000000040 RBX: ffffffff89fdf466 RCX: ffffc90002e51000
RDX: 0000000000040000 RSI: 0000000000000040 RDI: 0000000000000003
RBP: ffffc900105af660 R08: 0000000000000009 R09: ffffffff840118aa
R10: ffffffff84011d01 R11: 0000000000000070 R12: ffffffff89fdf467
R13: ffffffff89fdf466 R14: 1ffff920020b5eac R15: 0000000000000070
 format_decode+0x661/0xad0 lib/vsprintf.c:2572
 vsnprintf+0x157/0x14f0 lib/vsprintf.c:2757
 snprintf+0xbb/0xf0 lib/vsprintf.c:2938
 tomoyo_print_ipv4 security/tomoyo/network.c:93 [inline]
 tomoyo_audit_inet_log+0x2de/0x370 security/tomoyo/network.c:389
 tomoyo_inet_entry security/tomoyo/network.c:484 [inline]
 tomoyo_check_inet_address+0x5db/0x710 security/tomoyo/network.c:532
 tomoyo_socket_connect_permission+0x257/0x340 security/tomoyo/network.c:710
 security_socket_connect+0x50/0xb0 security/security.c:2192
 __sys_connect_file+0xa2/0x1a0 net/socket.c:1892
 io_connect+0x15f/0x690 fs/io_uring.c:5250
 io_issue_sqe+0xc64/0x7060 fs/io_uring.c:6716
 __io_queue_sqe fs/io_uring.c:7022 [inline]
 io_req_task_submit+0xce/0x450 fs/io_uring.c:2321
 tctx_task_work+0x1b3/0x630 fs/io_uring.c:2245
 task_work_run+0xdd/0x1a0 kernel/task_work.c:164
 tracehook_notify_signal include/linux/tracehook.h:214 [inline]
 handle_signal_work kernel/entry/common.c:146 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x256/0x290 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f818354fe99
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:00007f8181ec5168 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: 00000000000000d0 RBX: 00007f8183662f60 RCX: 00007f818354fe99
RDX: 0000000000000000 RSI: 00000000000045f5 RDI: 0000000000000005
RBP: 00007f81835a9ff1 R08: 0000000000000000 R09: 0000000000000004
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd9551906f R14: 00007f8181ec5300 R15: 0000000000022000
 </TASK>
rcu: rcu_preempt kthread starved for 10502 jiffies! g31101 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:28688 pid:   14 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4972 [inline]
 __schedule+0xa9a/0x4940 kernel/sched/core.c:6253
 schedule+0xd2/0x260 kernel/sched/core.c:6326
 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
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 0
CPU: 0 PID: 7672 Comm: syz-executor.5 Not tainted 5.16.0-rc6-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:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111
 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+0x1fb/0x200 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:3878 [inline]
 rcu_sched_clock_irq+0x2125/0x2200 kernel/rcu/tree.c:2597
 update_process_times+0x16d/0x200 kernel/time/timer.c:1785
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1428
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x1c0/0xe50 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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:csd_lock_wait kernel/smp.c:440 [inline]
RIP: 0010:smp_call_function_many_cond+0x452/0xc20 kernel/smp.c:969
Code: 0b 00 85 ed 74 4d 48 b8 00 00 00 00 00 fc ff df 4d 89 f4 4c 89 f5 49 c1 ec 03 83 e5 07 49 01 c4 83 c5 03 e8 40 78 0b 00 f3 90 <41> 0f b6 04 24 40 38 c5 7c 08 84 c0 0f 85 33 06 00 00 8b 43 08 31
RSP: 0018:ffffc90010587b18 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff8880b9d3fca0 RCX: 0000000000000000
RDX: ffff88807d43ba00 RSI: ffffffff816c2a00 RDI: 0000000000000003
RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff816c2a26 R11: 0000000000000000 R12: ffffed10173a7f95
R13: 0000000000000001 R14: ffff8880b9d3fca8 R15: 0000000000000001
 on_each_cpu_cond_mask+0x56/0xa0 kernel/smp.c:1135
 on_each_cpu include/linux/smp.h:71 [inline]
 text_poke_sync arch/x86/kernel/alternative.c:1112 [inline]
 text_poke_bp_batch+0x1b3/0x560 arch/x86/kernel/alternative.c:1297
 text_poke_flush arch/x86/kernel/alternative.c:1451 [inline]
 text_poke_flush arch/x86/kernel/alternative.c:1448 [inline]
 text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1458
 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146
 jump_label_update+0x1d5/0x430 kernel/jump_label.c:830
 static_key_disable_cpuslocked+0x152/0x1b0 kernel/jump_label.c:207
 static_key_disable+0x16/0x20 kernel/jump_label.c:215
 tracepoint_remove_func kernel/tracepoint.c:417 [inline]
 tracepoint_probe_unregister+0x632/0xc30 kernel/tracepoint.c:551
 bpf_raw_tp_link_release+0x51/0xa0 kernel/bpf/syscall.c:2881
 bpf_link_free+0xe6/0x1b0 kernel/bpf/syscall.c:2461
 bpf_link_put+0x161/0x1b0 kernel/bpf/syscall.c:2487
 bpf_link_release+0x33/0x40 kernel/bpf/syscall.c:2495
 __fput+0x286/0x9f0 fs/file_table.c:280
 task_work_run+0xdd/0x1a0 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
 exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f1a6943aadb
Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44
RSP: 002b:00007fff1e904ab0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00007f1a6943aadb
RDX: 00007f1a6959f600 RSI: ffffffffffffffff RDI: 0000000000000004
RBP: 00007f1a6959c960 R08: 0000000000000000 R09: 00007f1a6959f608
R10: 00007fff1e904bb0 R11: 0000000000000293 R12: 0000000000042a41
R13: 00007fff1e904bb0 R14: 00007f1a6959af60 R15: 0000000000000032
 </TASK>
----------------
Code disassembly (best guess):
   0:	12 00                	adc    (%rax),%al
   2:	00 48 89             	add    %cl,-0x77(%rax)
   5:	ee                   	out    %al,(%dx)
   6:	48 23 70 50          	and    0x50(%rax),%rsi
   a:	41 ba 01 00 00 00    	mov    $0x1,%r10d
  10:	0f 84 79 01 00 00    	je     0x18f
  16:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  1d:	fc ff df
  20:	48 01 c3             	add    %rax,%rbx
  23:	48 c7 03 00 00 00 00 	movq   $0x0,(%rbx)
* 2a:	c7 43 08 00 00 00 00 	movl   $0x0,0x8(%rbx) <-- trapping instruction
  31:	48 c7 43 10 00 00 00 	movq   $0x0,0x10(%rbx)
  38:	00
  39:	48                   	rex.W
  3a:	8b                   	.byte 0x8b
  3b:	84 24 10             	test   %ah,(%rax,%rdx,1)
  3e:	01 00                	add    %eax,(%rax)

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-root 2021/12/26 10:43 upstream 438645193e59 e4f103c4 .config log report info INFO: rcu detected stall in security_socket_connect
* Struck through repros no longer work on HEAD.