syzbot


INFO: rcu detected stall in dev_ioctl (3)

Status: auto-closed as invalid on 2022/04/29 15:27
Reported-by: syzbot+3aad3a16b16a0391c2ad@syzkaller.appspotmail.com
First crash: 819d, last: 819d
Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 INFO: rcu detected stall in dev_ioctl 1 1304d 1304d 0/1 auto-closed as invalid on 2020/12/30 14:33
linux-4.19 INFO: rcu detected stall in dev_ioctl (2) 1 942d 942d 0/1 auto-closed as invalid on 2021/12/27 14:21
upstream INFO: rcu detected stall in dev_ioctl batman 18 717d 1585d 0/26 auto-closed as invalid on 2022/08/09 13:29
upstream BUG: soft lockup in dev_ioctl batman 1 22d 18d 0/26 moderation: reported on 2024/03/11 02:45

Sample crash report:
batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320)
batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320)
batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320)
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=836/1/0x4000000000000002 softirq=340528/340529 fqs=5234 
rcu: 	 (t=10502 jiffies g=522989 q=7848)
NMI backtrace for cpu 0
CPU: 0 PID: 4766 Comm: syz-executor.3 Not tainted 4.19.211-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:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x15f/0x19c kernel/rcu/tree.c:1340
 print_cpu_stall kernel/rcu/tree.c:1478 [inline]
 check_cpu_stall kernel/rcu/tree.c:1550 [inline]
 __rcu_pending kernel/rcu/tree.c:3293 [inline]
 rcu_pending kernel/rcu/tree.c:3336 [inline]
 rcu_check_callbacks.cold+0x62d/0xe19 kernel/rcu/tree.c:2682
 update_process_times+0x2a/0x70 kernel/time/timer.c:1650
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:168
 tick_sched_timer+0xfc/0x290 kernel/time/tick-sched.c:1278
 __run_hrtimer kernel/time/hrtimer.c:1465 [inline]
 __hrtimer_run_queues+0x3f6/0xe60 kernel/time/hrtimer.c:1527
 hrtimer_interrupt+0x326/0x9e0 kernel/time/hrtimer.c:1585
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1071 [inline]
 smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1096
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline]
RIP: 0010:lock_acquire+0x1ec/0x3c0 kernel/locking/lockdep.c:3911
Code: 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 b7 01 00 00 48 83 3d 09 2e a6 08 00 0f 84 2a 01 00 00 48 8b 7c 24 08 57 9d <0f> 1f 44 00 00 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 65 8b
RSP: 0018:ffff88801184f6a8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff13e3051 RBX: ffff88804e9ee380 RCX: 00000000000071d9
RDX: dffffc0000000000 RSI: 0000000009b92eb4 RDI: 0000000000000286
RBP: ffff88801b88c010 R08: ffffffff8cd50408 R09: 0000000000000002
R10: ffff88804e9eec58 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
 _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:168
 spin_lock_bh include/linux/spinlock.h:334 [inline]
 batadv_tt_local_purge_pending_clients+0x112/0x3a0 net/batman-adv/translation-table.c:3905
 batadv_tt_local_resize_to_mtu+0x96/0x130 net/batman-adv/translation-table.c:4208
 batadv_update_min_mtu net/batman-adv/hard-interface.c:637 [inline]
 batadv_hard_if_event+0xbb3/0x15c0 net/batman-adv/hard-interface.c:1059
 notifier_call_chain+0xc0/0x230 kernel/notifier.c:93
 call_netdevice_notifiers_mtu net/core/dev.c:1785 [inline]
 dev_set_mtu_ext+0x384/0x580 net/core/dev.c:7819
 dev_set_mtu+0x95/0x120 net/core/dev.c:7840
 dev_ifsioc+0x30a/0x8c0 net/core/dev_ioctl.c:244
 dev_ioctl+0x1ab/0xc50 net/core/dev_ioctl.c:488
 sock_do_ioctl+0x178/0x300 net/socket.c:1038
 sock_ioctl+0x2ef/0x5d0 net/socket.c:1135
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fcdf18a8e99
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:00007fcdf021e168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fcdf19bbf60 RCX: 00007fcdf18a8e99
RDX: 0000000020000040 RSI: 0000000000008922 RDI: 0000000000000004
RBP: 00007fcdf1902ff1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffdd82fbbf R14: 00007fcdf021e300 R15: 0000000000022000
net_ratelimit: 5449 callbacks suppressed
batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320)
batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320)
batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320)
batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320)
batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320)
batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320)
batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320)
batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320)
batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320)
batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320)
rcu: INFO: rcu_sched detected stalls on CPUs/tasks:
rcu: 	0-....: (10544 ticks this GP) idle=836/1/0x4000000000000000 softirq=340500/340529 fqs=5212 
rcu: 	(detected by 1, t=10502 jiffies, g=12461, q=5)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4766 Comm: syz-executor.3 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline]
RIP: 0010:lock_release+0x429/0x8b0 kernel/locking/lockdep.c:3930
Code: 84 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 95 03 00 00 48 83 3d 7b 34 a6 08 00 0f 84 cc 01 00 00 48 8b 3c 24 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 49 c7 04 04 00 00 00
RSP: 0018:ffff88801184f650 EFLAGS: 00000286
RAX: 1ffffffff13e3051 RBX: ffff88804e9ee380 RCX: 1ffff11009d3dd8b
RDX: dffffc0000000000 RSI: 0000000000000003 RDI: 0000000000000286
RBP: 0000000000000002 R08: 0000000000000001 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff11002309ecd
R13: 6e6b014b03b0a3b9 R14: ffff88804e9ee380 R15: 0000000000000003
FS:  00007fcdf021e700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000009ac5f000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:174 [inline]
 _raw_spin_unlock_bh+0x17/0x30 kernel/locking/spinlock.c:200
 spin_unlock_bh include/linux/spinlock.h:374 [inline]
 batadv_tt_local_purge_pending_clients+0x2aa/0x3a0 net/batman-adv/translation-table.c:3924
 batadv_tt_local_resize_to_mtu+0x96/0x130 net/batman-adv/translation-table.c:4208
 batadv_update_min_mtu net/batman-adv/hard-interface.c:637 [inline]
 batadv_hard_if_event+0xbb3/0x15c0 net/batman-adv/hard-interface.c:1059
 notifier_call_chain+0xc0/0x230 kernel/notifier.c:93
 call_netdevice_notifiers_mtu net/core/dev.c:1785 [inline]
 dev_set_mtu_ext+0x384/0x580 net/core/dev.c:7819
 dev_set_mtu+0x95/0x120 net/core/dev.c:7840
 dev_ifsioc+0x30a/0x8c0 net/core/dev_ioctl.c:244
 dev_ioctl+0x1ab/0xc50 net/core/dev_ioctl.c:488
 sock_do_ioctl+0x178/0x300 net/socket.c:1038
 sock_ioctl+0x2ef/0x5d0 net/socket.c:1135
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fcdf18a8e99
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:00007fcdf021e168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fcdf19bbf60 RCX: 00007fcdf18a8e99
RDX: 0000000020000040 RSI: 0000000000008922 RDI: 0000000000000004
RBP: 00007fcdf1902ff1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffdd82fbbf R14: 00007fcdf021e300 R15: 0000000000022000
rcu: INFO: rcu_sched detected expedited stalls on CPUs/tasks: { 0-... } 10620 jiffies s: 4665 root: 0x1/.
rcu: blocking rcu_node structures:
Task dump for CPU 0:
syz-executor.3  R  running task    26512  4766  18697 0x8000000e
Call Trace:
net_ratelimit: 5022 callbacks suppressed
batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320)
batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320)
batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320)
batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320)
batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320)
batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320)
batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320)
batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320)
batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320)
batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (-320)
----------------
Code disassembly (best guess):
   0:	08 00                	or     %al,(%rax)
   2:	00 00                	add    %al,(%rax)
   4:	00 00                	add    %al,(%rax)
   6:	00 48 c1             	add    %cl,-0x3f(%rax)
   9:	e8 03 80 3c 10       	callq  0x103c8011
   e:	00 0f                	add    %cl,(%rdi)
  10:	85 b7 01 00 00 48    	test   %esi,0x48000001(%rdi)
  16:	83 3d 09 2e a6 08 00 	cmpl   $0x0,0x8a62e09(%rip)        # 0x8a62e26
  1d:	0f 84 2a 01 00 00    	je     0x14d
  23:	48 8b 7c 24 08       	mov    0x8(%rsp),%rdi
  28:	57                   	push   %rdi
  29:	9d                   	popfq
* 2a:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1) <-- trapping instruction
  2f:	48 83 c4 18          	add    $0x18,%rsp
  33:	5b                   	pop    %rbx
  34:	5d                   	pop    %rbp
  35:	41 5c                	pop    %r12
  37:	41 5d                	pop    %r13
  39:	41 5e                	pop    %r14
  3b:	41 5f                	pop    %r15
  3d:	c3                   	retq
  3e:	65                   	gs
  3f:	8b                   	.byte 0x8b

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/12/30 15:26 linux-4.19.y 3f8a27f9e27b 2e49f10d .config console log report info ci2-linux-4-19 INFO: rcu detected stall in dev_ioctl
* Struck through repros no longer work on HEAD.