syzbot


INFO: rcu detected stall in addrconf_rs_timer (2)
Status: auto-closed as invalid on 2020/12/31 12:17
Reported-by: syzbot+d0c0ddbcb4605d2c9bac@syzkaller.appspotmail.com
First crash: 701d, last: 627d
similar bugs (7):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in addrconf_rs_timer (2) 362 963d 985d 14/22 fixed on 2019/10/21 12:31
linux-4.14 INFO: rcu detected stall in addrconf_rs_timer C error 220 626d 989d 0/1 upstream: reported C repro on 2019/09/06 14:33
upstream INFO: rcu detected stall in addrconf_rs_timer 38 1249d 1345d 0/22 closed as dup on 2019/01/02 16:33
linux-4.19 INFO: rcu detected stall in addrconf_rs_timer 45 977d 989d 0/1 auto-closed as invalid on 2019/12/17 18:46
linux-4.19 BUG: soft lockup in addrconf_rs_timer syz error 16 25d 429d 0/1 upstream: reported syz repro on 2021/03/19 06:05
upstream INFO: rcu detected stall in addrconf_rs_timer (3) C inconclusive done 81 885d 881d 16/22 fixed on 2020/02/18 14:31
upstream INFO: rcu detected stall in addrconf_rs_timer (4) C error error 121 203d 657d 0/22 closed as invalid on 2022/02/08 10:39

Sample crash report:
device vlan1099 left promiscuous mode
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'.
device vlan1098 left promiscuous mode
device bridge10 entered promiscuous mode
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10499 ticks this GP) idle=0f2/1/0x4000000000000004 softirq=197737/197737 fqs=7 
rcu: 	 (t=10501 jiffies g=272273 q=1579)
rcu: rcu_preempt kthread starved for 10486 jiffies! g272273 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt     R  running task    29728    10      2 0x80000000
Call Trace:
 context_switch kernel/sched/core.c:2828 [inline]
 __schedule+0x887/0x2040 kernel/sched/core.c:3517
 schedule+0x8d/0x1b0 kernel/sched/core.c:3561
 schedule_timeout+0x4cf/0xfe0 kernel/time/timer.c:1825
 rcu_gp_kthread+0xdad/0x21c0 kernel/rcu/tree.c:2202
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
NMI backtrace for cpu 1
CPU: 1 PID: 21555 Comm: syz-executor.0 Not tainted 4.19.142-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/0x2fe lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1a6/0x1eb 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/0xb0 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:1401 [inline]
 __hrtimer_run_queues+0x3f6/0xe60 kernel/time/hrtimer.c:1463
 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1521
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline]
 smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1092
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:149 [inline]
RIP: 0010:unwind_next_frame+0x271/0x1c60 arch/x86/kernel/unwind_orc.c:429
Code: 24 30 48 89 74 24 28 44 89 54 24 20 48 89 4c 24 18 e8 03 d8 70 00 4c 8b 44 24 30 48 8b 74 24 28 44 8b 54 24 20 48 8b 4c 24 18 <46> 8b 1c 85 8c de 85 8a 44 8d 46 01 48 ba 00 00 00 00 00 fc ff df
RSP: 0018:ffff8880ae707260 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 1ffff11015ce0e54 RCX: ffffffff8645890a
RDX: 0000000000000003 RSI: 0000000000054589 RDI: ffffffff8a9af4b0
RBP: 0000000000000002 R08: 0000000000054589 R09: 0000000000000000
R10: 0000000000066061 R11: 0000000000000001 R12: ffff8880ae707390
R13: ffff8880ae70737d R14: ffff8880ae707380 R15: ffff8880ae707348
 __save_stack_trace+0x9f/0x190 arch/x86/kernel/stacktrace.c:44
 save_stack mm/kasan/kasan.c:448 [inline]
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:553
 __do_kmalloc_node mm/slab.c:3689 [inline]
 __kmalloc_node_track_caller+0x4c/0x70 mm/slab.c:3703
 __kmalloc_reserve net/core/skbuff.c:137 [inline]
 __alloc_skb+0xae/0x560 net/core/skbuff.c:205
 alloc_skb include/linux/skbuff.h:995 [inline]
 nlmsg_new include/net/netlink.h:511 [inline]
 __neigh_notify+0x84/0x160 net/core/neighbour.c:2914
 neigh_cleanup_and_release+0x71/0xd0 net/core/neighbour.c:106
 neigh_del+0x1e5/0x2b0 net/core/neighbour.c:142
 neigh_forced_gc net/core/neighbour.c:191 [inline]
 neigh_alloc net/core/neighbour.c:317 [inline]
 __neigh_create+0xd72/0x1c40 net/core/neighbour.c:501
 ip6_finish_output2+0x8cc/0x2290 net/ipv6/ip6_output.c:117
 ip6_finish_output+0x7eb/0xc10 net/ipv6/ip6_output.c:154
 NF_HOOK_COND include/linux/netfilter.h:278 [inline]
 ip6_output+0x205/0x770 net/ipv6/ip6_output.c:171
 dst_output include/net/dst.h:455 [inline]
 NF_HOOK include/linux/netfilter.h:289 [inline]
 ndisc_send_skb+0xa24/0x1720 net/ipv6/ndisc.c:491
 ndisc_send_rs+0x131/0x690 net/ipv6/ndisc.c:685
 addrconf_rs_timer+0x2d9/0x640 net/ipv6/addrconf.c:3834
 call_timer_fn+0x177/0x700 kernel/time/timer.c:1338
 expire_timers+0x243/0x4e0 kernel/time/timer.c:1375
 __run_timers kernel/time/timer.c:1703 [inline]
 run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1716
 __do_softirq+0x26c/0x9a0 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:372 [inline]
 irq_exit+0x215/0x260 kernel/softirq.c:412
 exiting_irq arch/x86/include/asm/apic.h:544 [inline]
 smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1094
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
 </IRQ>
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x50/0x80 kernel/locking/spinlock.c:192
Code: c0 58 5b d2 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 31 48 83 3d 61 d0 94 01 00 74 25 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 86 15 0a fa 65 8b 05 bf 62 c4 78 85 c0 74 02 5d
RSP: 0018:ffff8881ecc1f4c0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff11a4b6b RBX: ffff8881fc70c3c0 RCX: 1ffff1103f8e19a1
RDX: dffffc0000000000 RSI: ffff8881fc70cce8 RDI: ffff8881fc70cc44
RBP: ffff8880ae72c2c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880ae72c2c0
R13: ffff888215984580 R14: 0000000000000000 R15: 0000000000000001
 finish_lock_switch kernel/sched/core.c:2578 [inline]
 finish_task_switch+0x146/0x780 kernel/sched/core.c:2678
 context_switch kernel/sched/core.c:2831 [inline]
 __schedule+0x88f/0x2040 kernel/sched/core.c:3517
 preempt_schedule_irq+0xb0/0x140 kernel/sched/core.c:3744
 retint_kernel+0x1b/0x2d
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline]
RIP: 0010:lock_acquire+0x1ec/0x3c0 kernel/locking/lockdep.c:3910
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 d9 c7 80 07 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:ffff8881ecc1f6d0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff11a4b69 RBX: ffff8881fc70c3c0 RCX: 0000000000007f4c
RDX: dffffc0000000000 RSI: 00000000eeaa6727 RDI: 0000000000000282
RBP: ffffffff88e049e0 R08: ffffffff8b42a2e0 R09: 0000000000000004
R10: ffff8881fc70cce8 R11: 000000002ab4b003 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
 __fs_reclaim_acquire mm/page_alloc.c:3758 [inline]
 fs_reclaim_acquire+0x105/0x130 mm/page_alloc.c:3769
 slab_pre_alloc_hook mm/slab.h:419 [inline]
 slab_alloc_node mm/slab.c:3304 [inline]
 kmem_cache_alloc_node_trace+0x36/0x3b0 mm/slab.c:3666
 kmalloc_node include/linux/slab.h:553 [inline]
 init_cache_node+0x39/0x170 mm/slab.c:869
 setup_kmem_cache_node+0x102/0x510 mm/slab.c:938
 setup_kmem_cache_nodes mm/slab.c:3837 [inline]
 __do_tune_cpucache+0x161/0x210 mm/slab.c:3907
 do_tune_cpucache mm/slab.c:3916 [inline]
 enable_cpucache+0x50/0x130 mm/slab.c:3997
 __kmem_cache_create+0x1a7/0x260 mm/slab.c:2152
 create_cache+0xd1/0x1f0 mm/slab_common.c:400
 kmem_cache_create_usercopy+0x1a6/0x240 mm/slab_common.c:496
 p9_client_create+0xcb5/0x12e0 net/9p/client.c:1076
 v9fs_session_init+0x1dd/0x1770 fs/9p/v9fs.c:421
 v9fs_mount+0x73/0x910 fs/9p/vfs_super.c:135
 mount_fs+0xa3/0x30c fs/super.c:1261
 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961
 vfs_kern_mount fs/namespace.c:951 [inline]
 do_new_mount fs/namespace.c:2469 [inline]
 do_mount+0x113c/0x2f10 fs/namespace.c:2799
 ksys_mount+0xcf/0x130 fs/namespace.c:3015
 __do_sys_mount fs/namespace.c:3029 [inline]
 __se_sys_mount fs/namespace.c:3026 [inline]
 __x64_sys_mount+0xba/0x150 fs/namespace.c:3026
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45d5b9
Code: 5d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f186c741c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000021280 RCX: 000000000045d5b9
RDX: 0000000020000100 RSI: 0000000020000040 RDI: 0000000000000000
RBP: 000000000118cf90 R08: 0000000020000380 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c
R13: 00007ffdf45c1c4f R14: 00007f186c7429c0 R15: 000000000118cf4c
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'.
netlink: 'syz-executor.3': attribute type 1 has an invalid length.
device bridge_slave_0 left promiscuous mode
bridge0: port 1(bridge_slave_0) entered disabled state
bridge10: port 1(bridge_slave_0) entered blocking state
bridge10: port 1(bridge_slave_0) entered disabled state
device bridge_slave_0 entered promiscuous mode
bridge10: port 1(bridge_slave_0) entered blocking state
bridge10: port 1(bridge_slave_0) entered forwarding state
device vlan1102 left promiscuous mode
device vlan1101 left promiscuous mode

Crashes (5):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-linux-4-19 2020/09/02 12:16 linux-4.19.y f6d5cb9e2c06 abf9ba4f .config log report
ci2-linux-4-19 2020/08/22 14:42 linux-4.19.y d18b78abc0c6 6436ce4b .config log report
ci2-linux-4-19 2020/08/02 01:41 linux-4.19.y 13af6c74b14a 8df85ed9 .config log report
ci2-linux-4-19 2020/07/10 01:30 linux-4.19.y dce0f88600e4 edf162e8 .config log report
ci2-linux-4-19 2020/06/21 03:37 linux-4.19.y 3fc898571b97 c655ec77 .config log report