syzbot


BUG: soft lockup in mld_dad_timer_expire (2)

Status: auto-closed as invalid on 2022/04/06 03:57
Reported-by: syzbot+0d0a73af53b7c0625dde@syzkaller.appspotmail.com
First crash: 202d, last: 202d
similar bugs (2):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.14 BUG: soft lockup in mld_dad_timer_expire 1 351d 351d 0/1 auto-closed as invalid on 2021/11/07 19:15
linux-4.19 BUG: soft lockup in mld_dad_timer_expire 1 135d 135d 0/1 auto-closed as invalid on 2022/06/11 22:48

Sample crash report:
Bluetooth: hci3 command 0x0419 tx timeout
audit: type=1804 audit(1638849337.074:2): pid=9433 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.3" name="/root/syzkaller-testdir435365706/syzkaller.0AnEuv/0/file0" dev="sda1" ino=13897 res=1
watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor.4:9420]
Modules linked in:
irq event stamp: 7019491
hardirqs last  enabled at (7019490): [<ffffffff817eaf70>] kmem_cache_free+0x160/0x2b0 mm/slab.c:3759
hardirqs last disabled at (7019491): [<ffffffff874018ae>] apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:793
softirqs last  enabled at (2802): [<ffffffff862065f8>] fib_table_delete+0x7c8/0xe20 net/ipv4/fib_trie.c:1590
softirqs last disabled at (3057): [<ffffffff81321d13>] invoke_softirq kernel/softirq.c:368 [inline]
softirqs last disabled at (3057): [<ffffffff81321d13>] irq_exit+0x193/0x240 kernel/softirq.c:409
CPU: 0 PID: 9420 Comm: syz-executor.4 Not tainted 4.14.256-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880b4c96140 task.stack: ffff88806afb0000
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline]
RIP: 0010:kmem_cache_free+0x173/0x2b0 mm/slab.c:3759
RSP: 0018:ffff8880ba406f18 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10
RAX: 0000000000000007 RBX: ffff8880589e8500 RCX: 1ffff11016992d4c
RDX: 0000000000000000 RSI: ffff8880b4c96b30 RDI: 0000000000000286
RBP: ffff88823a817240 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000286
R13: ffffffff85be5e18 R14: ffffffff85c2a95a R15: 00000000000354c0
FS:  00007f8b15a99700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000186bd10 CR3: 0000000096e75000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 kfree_skbmem+0x98/0x100 net/core/skbuff.c:595
 __kfree_skb net/core/skbuff.c:655 [inline]
 kfree_skb+0xf4/0x390 net/core/skbuff.c:672
 enqueue_to_backlog+0x23a/0xce0 net/core/dev.c:3906
 netif_rx_internal+0xe2/0x800 net/core/dev.c:4072
 loopback_xmit+0x23a/0x580 drivers/net/loopback.c:91
 __netdev_start_xmit include/linux/netdevice.h:4051 [inline]
 netdev_start_xmit include/linux/netdevice.h:4060 [inline]
 xmit_one net/core/dev.c:3005 [inline]
 dev_hard_start_xmit+0x188/0x890 net/core/dev.c:3021
 __dev_queue_xmit+0x1d7f/0x2480 net/core/dev.c:3521
 neigh_hh_output include/net/neighbour.h:490 [inline]
 neigh_output include/net/neighbour.h:498 [inline]
 ip_finish_output2+0x9db/0x1340 net/ipv4/ip_output.c:230
 ip_do_fragment+0xa24/0x1fb0 net/ipv4/ip_output.c:815
 ip_fragment.constprop.0+0x146/0x200 net/ipv4/ip_output.c:551
 ip_finish_output+0x89e/0xc50 net/ipv4/ip_output.c:316
 NF_HOOK_COND include/linux/netfilter.h:239 [inline]
 ip_output+0x1cd/0x510 net/ipv4/ip_output.c:406
 dst_output include/net/dst.h:470 [inline]
 ip_local_out+0x93/0x170 net/ipv4/ip_output.c:125
 iptunnel_xmit+0x5cc/0x950 net/ipv4/ip_tunnel_core.c:91
 geneve_xmit_skb drivers/net/geneve.c:867 [inline]
 geneve_xmit+0xf15/0x2ca0 drivers/net/geneve.c:948
 __netdev_start_xmit include/linux/netdevice.h:4051 [inline]
 netdev_start_xmit include/linux/netdevice.h:4060 [inline]
 xmit_one net/core/dev.c:3005 [inline]
 dev_hard_start_xmit+0x188/0x890 net/core/dev.c:3021
 __dev_queue_xmit+0x1d7f/0x2480 net/core/dev.c:3521
 neigh_hh_output include/net/neighbour.h:490 [inline]
 neigh_output include/net/neighbour.h:498 [inline]
 ip6_finish_output2+0xc6a/0x1f10 net/ipv6/ip6_output.c:120
 ip6_finish_output+0x5c6/0xd50 net/ipv6/ip6_output.c:192
 NF_HOOK_COND include/linux/netfilter.h:239 [inline]
 ip6_output+0x1c5/0x660 net/ipv6/ip6_output.c:209
 dst_output include/net/dst.h:470 [inline]
 NF_HOOK include/linux/netfilter.h:250 [inline]
 mld_sendpack+0x5fe/0xea0 net/ipv6/mcast.c:1657
 mld_send_initial_cr.part.0+0xf5/0x140 net/ipv6/mcast.c:2074
 mld_send_initial_cr net/ipv6/mcast.c:1170 [inline]
 mld_dad_timer_expire+0x140/0x520 net/ipv6/mcast.c:2093
 call_timer_fn+0x14a/0x650 kernel/time/timer.c:1280
 expire_timers+0x232/0x4d0 kernel/time/timer.c:1319
 __run_timers kernel/time/timer.c:1637 [inline]
 run_timer_softirq+0x1d5/0x5a0 kernel/time/timer.c:1650
 __do_softirq+0x24d/0x9ff kernel/softirq.c:288
 invoke_softirq kernel/softirq.c:368 [inline]
 irq_exit+0x193/0x240 kernel/softirq.c:409
 exiting_irq arch/x86/include/asm/apic.h:638 [inline]
 smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1106
 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793
 </IRQ>
RIP: 0010:__sanitizer_cov_trace_pc+0x3d/0x50 kernel/kcov.c:87
RSP: 0018:ffff88806afb67b0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10
RAX: 0000000000040000 RBX: 00007f8b16b23af9 RCX: ffffc900079fd000
RDX: 000000000000822d RSI: ffffffff815e2676 RDI: ffff8880ba42ca8c
RBP: 00007f8b16b23af9 R08: 0000000000000000 R09: 0000000000020012
R10: ffff8880b4c96a18 R11: ffff8880b4c96140 R12: ffff88806afb68a8
R13: 0000000000000000 R14: ffff88813fe74040 R15: 00000000000000c0
 bpf_jit_kallsyms_enabled include/linux/filter.h:803 [inline]
 bpf_prog_kallsyms_find kernel/bpf/core.c:420 [inline]
 is_bpf_text_address+0x56/0x150 kernel/bpf/core.c:458
 kernel_text_address kernel/extable.c:150 [inline]
 kernel_text_address+0xbd/0xf0 kernel/extable.c:120
 __kernel_text_address+0x9/0x30 kernel/extable.c:105
 unwind_get_return_address arch/x86/kernel/unwind_orc.c:252 [inline]
 unwind_get_return_address+0x51/0x90 arch/x86/kernel/unwind_orc.c:247
 __save_stack_trace+0xa0/0x160 arch/x86/kernel/stacktrace.c:45
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
 slab_post_alloc_hook mm/slab.h:442 [inline]
 slab_alloc mm/slab.c:3390 [inline]
 __do_kmalloc mm/slab.c:3718 [inline]
 __kmalloc+0x144/0x400 mm/slab.c:3729
 kmalloc include/linux/slab.h:493 [inline]
 kzalloc include/linux/slab.h:661 [inline]
 tnode_alloc net/ipv4/fib_trie.c:343 [inline]
 tnode_new+0x74/0x2a0 net/ipv4/fib_trie.c:390
 inflate net/ipv4/fib_trie.c:601 [inline]
 resize+0x869/0x1d00 net/ipv4/fib_trie.c:874
 trie_rebalance net/ipv4/fib_trie.c:1014 [inline]
 fib_remove_alias net/ipv4/fib_trie.c:1510 [inline]
 fib_table_delete+0xa70/0xe20 net/ipv4/fib_trie.c:1585
 fib_magic+0x2db/0x460 net/ipv4/fib_frontend.c:863
 fib_del_ifaddr+0x9f4/0xe10 net/ipv4/fib_frontend.c:1043
 fib_inetaddr_event+0xa5/0x260 net/ipv4/fib_frontend.c:1174
 notifier_call_chain+0x108/0x1a0 kernel/notifier.c:93
 __blocking_notifier_call_chain kernel/notifier.c:317 [inline]
 __blocking_notifier_call_chain kernel/notifier.c:304 [inline]
 blocking_notifier_call_chain kernel/notifier.c:328 [inline]
 blocking_notifier_call_chain+0x79/0x90 kernel/notifier.c:325
 __inet_del_ifa+0x4c1/0xaf0 net/ipv4/devinet.c:409
 inet_del_ifa net/ipv4/devinet.c:439 [inline]
 inetdev_destroy net/ipv4/devinet.c:304 [inline]
 inetdev_event+0x4ec/0x10a0 net/ipv4/devinet.c:1529
 notifier_call_chain+0x108/0x1a0 kernel/notifier.c:93
 call_netdevice_notifiers_info net/core/dev.c:1667 [inline]
 call_netdevice_notifiers_mtu net/core/dev.c:1706 [inline]
 dev_set_mtu+0x23d/0x3c0 net/core/dev.c:6921
 do_setlink+0x4f3/0x2bf0 net/core/rtnetlink.c:2055
 rtnl_group_changelink net/core/rtnetlink.c:2512 [inline]
 rtnl_newlink+0xccc/0x1860 net/core/rtnetlink.c:2666
 rtnetlink_rcv_msg+0x3be/0xb10 net/core/rtnetlink.c:4320
 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2441
 netlink_unicast_kernel net/netlink/af_netlink.c:1294 [inline]
 netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1320
 netlink_sendmsg+0x638/0xb90 net/netlink/af_netlink.c:1886
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0x100 net/socket.c:656
 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062
 __sys_sendmsg+0xa3/0x120 net/socket.c:2096
 SYSC_sendmsg net/socket.c:2107 [inline]
 SyS_sendmsg+0x27/0x40 net/socket.c:2103
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7f8b16b23af9
RSP: 002b:00007f8b15a99188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f8b16c36f60 RCX: 00007f8b16b23af9
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000004
RBP: 00007f8b16b7dff7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe2238aeff R14: 00007f8b15a99300 R15: 0000000000022000
Code: eb 11 48 63 75 74 48 89 df e8 7a 3b 9b 01 e9 11 ff ff ff e8 60 c8 c2 ff 48 83 3d 50 e4 71 07 00 0f 84 22 01 00 00 4c 89 e7 57 9d <0f> 1f 44 00 00 e9 31 ff ff ff 65 8b 05 9c 71 83 7e 83 f8 07 0f 
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff8723c75e
----------------
Code disassembly (best guess):
   0:	eb 11                	jmp    0x13
   2:	48 63 75 74          	movslq 0x74(%rbp),%rsi
   6:	48 89 df             	mov    %rbx,%rdi
   9:	e8 7a 3b 9b 01       	callq  0x19b3b88
   e:	e9 11 ff ff ff       	jmpq   0xffffff24
  13:	e8 60 c8 c2 ff       	callq  0xffc2c878
  18:	48 83 3d 50 e4 71 07 	cmpq   $0x0,0x771e450(%rip)        # 0x771e470
  1f:	00
  20:	0f 84 22 01 00 00    	je     0x148
  26:	4c 89 e7             	mov    %r12,%rdi
  29:	57                   	push   %rdi
  2a:	9d                   	popfq
* 2b:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1) <-- trapping instruction
  30:	e9 31 ff ff ff       	jmpq   0xffffff66
  35:	65 8b 05 9c 71 83 7e 	mov    %gs:0x7e83719c(%rip),%eax        # 0x7e8371d8
  3c:	83 f8 07             	cmp    $0x7,%eax
  3f:	0f                   	.byte 0xf

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-linux-4-14 2021/12/07 03:56 linux-4.14.y 66722c42ec91 0230ba3e .config log report info BUG: soft lockup in mld_dad_timer_expire