syzbot


BUG: soft lockup in mld_ifc_work

Status: auto-obsoleted due to no activity on 2023/09/15 05:45
Reported-by: syzbot+1a46c68d4aa6777c6063@syzkaller.appspotmail.com
First crash: 271d, last: 271d
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 BUG: soft lockup in mld_ifc_work 1 228d 228d 0/3 auto-obsoleted due to no activity on 2023/10/28 19:55
upstream BUG: soft lockup in mld_ifc_work net 6 225d 200d 0/26 auto-obsoleted due to no activity on 2023/10/31 17:53
upstream INFO: rcu detected stall in mld_ifc_work net C inconclusive 1 750d 750d 22/26 fixed on 2023/02/24 13:50

Sample crash report:
watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [kworker/1:16:17021]
Modules linked in:
irq event stamp: 276413
hardirqs last  enabled at (276412): [<ffff8000121071c0>] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:84 [inline]
hardirqs last  enabled at (276412): [<ffff8000121071c0>] exit_to_kernel_mode+0xe8/0x118 arch/arm64/kernel/entry-common.c:94
hardirqs last disabled at (276413): [<ffff800012104e9c>] __el1_irq arch/arm64/kernel/entry-common.c:468 [inline]
hardirqs last disabled at (276413): [<ffff800012104e9c>] el1_interrupt+0x24/0x68 arch/arm64/kernel/entry-common.c:486
softirqs last  enabled at (269998): [<ffff80001108833c>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (270000): [<ffff800010f1b6b4>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
CPU: 1 PID: 17021 Comm: kworker/1:16 Not tainted 6.1.32-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
Workqueue: mld mld_ifc_work
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : list_add_tail include/linux/list.h:102 [inline]
pc : list_move_tail include/linux/list.h:230 [inline]
pc : fq_pie_qdisc_dequeue+0x3ac/0x8ac net/sched/sch_fq_pie.c:248
lr : __list_del_entry include/linux/list.h:137 [inline]
lr : list_move_tail include/linux/list.h:229 [inline]
lr : fq_pie_qdisc_dequeue+0x290/0x8ac net/sched/sch_fq_pie.c:248
sp : ffff8000239970e0
x29: ffff800023997150 x28: ffff00013f210f20 x27: ffff0000d9dc3ae8
x26: ffff0000d9dc3af0 x25: dfff800000000000 x24: ffff0000d9dc3ae0
x23: ffff00013f210f10 x22: 0000000000000040 x21: ffff0000d9dc3ae0
x20: ffff0000d9dc3ae8 x19: ffff0000d9dc3ae0 x18: ffff0000d9236008
x17: 0000000000000000 x16: ffff8000084fa384 x15: 0000000000000000
x14: 0000000000000000 x13: 0000000000000001 x12: ffff00012c6f5340
x11: ff80800010718f60 x10: 0000000000000000 x9 : ffff800010718f60
x8 : 0000000000000000 x7 : ffff80000840686c x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000
x2 : ffff00013f210f20 x1 : 0000000000000000 x0 : ffff00013f210f28
Call trace:
 list_add_tail include/linux/list.h:102 [inline]
 list_move_tail include/linux/list.h:230 [inline]
 fq_pie_qdisc_dequeue+0x3ac/0x8ac net/sched/sch_fq_pie.c:248
 dequeue_skb net/sched/sch_generic.c:292 [inline]
 qdisc_restart net/sched/sch_generic.c:397 [inline]
 __qdisc_run+0x204/0x239c net/sched/sch_generic.c:415
 __dev_xmit_skb net/core/dev.c:3885 [inline]
 __dev_queue_xmit+0xe14/0x38d8 net/core/dev.c:4227
 dev_queue_xmit include/linux/netdevice.h:3018 [inline]
 neigh_connected_output+0x2f8/0x38c net/core/neighbour.c:1612
 neigh_output include/net/neighbour.h:546 [inline]
 ip6_finish_output2+0xdb4/0x1a98 net/ipv6/ip6_output.c:134
 __ip6_finish_output net/ipv6/ip6_output.c:195 [inline]
 ip6_finish_output+0x538/0x8c8 net/ipv6/ip6_output.c:206
 NF_HOOK_COND include/linux/netfilter.h:291 [inline]
 ip6_output+0x270/0x594 net/ipv6/ip6_output.c:227
 dst_output include/net/dst.h:444 [inline]
 NF_HOOK+0x160/0x4f0 include/linux/netfilter.h:302
 mld_sendpack+0x904/0x1358 net/ipv6/mcast.c:1820
 mld_send_cr net/ipv6/mcast.c:2121 [inline]
 mld_ifc_work+0x848/0xc20 net/ipv6/mcast.c:2653
 process_one_work+0x7ac/0x1404 kernel/workqueue.c:2289
 worker_thread+0x8e4/0xfec kernel/workqueue.c:2436
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/06/07 05:45 linux-6.1.y 76ba310227d2 a4ae4f42 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in mld_ifc_work
* Struck through repros no longer work on HEAD.