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INFO: task hung in addrconf_verify_work

Status: auto-closed as invalid on 2020/07/16 23:17
Reported-by: syzbot+27ef9f129f87016bbc8e@syzkaller.appspotmail.com
First crash: 1499d, last: 1499d
▶ ▼ Similar bugs (20)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-49 INFO: task hung in addrconf_verify_work 18 1667d 1839d 0/3 auto-closed as invalid on 2020/01/31 12:44
linux-6.1 INFO: task hung in addrconf_verify_work (2) 3 42d 87d 0/3 upstream: reported on 2024/01/29 22:05
linux-4.19 INFO: task hung in addrconf_verify_work (5) 3 653d 692d 0/1 auto-obsoleted due to no activity on 2022/11/10 09:18
linux-4.19 INFO: task hung in addrconf_verify_work (6) C error 4 434d 494d 0/1 upstream: reported C repro on 2022/12/19 15:22
linux-4.19 INFO: task hung in addrconf_verify_work (3) 1 1140d 1140d 0/1 auto-closed as invalid on 2021/07/11 07:19
linux-4.19 INFO: task hung in addrconf_verify_work (4) 6 834d 921d 0/1 auto-closed as invalid on 2022/05/13 00:19
linux-4.14 INFO: task hung in addrconf_verify_work (2) C error 7 432d 1276d 0/1 upstream: reported C repro on 2020/10/28 05:47
upstream INFO: task hung in addrconf_verify_work (2) net C 22 1656d 1656d 13/26 fixed on 2019/11/04 14:50
linux-4.19 INFO: task hung in addrconf_verify_work (2) 2 1280d 1370d 0/1 auto-closed as invalid on 2021/02/21 08:05
android-414 INFO: task hung in addrconf_verify_work C 6 1656d 1841d 0/1 public: reported C repro on 2019/04/12 00:01
upstream INFO: task hung in addrconf_verify_work (8) net C error 64 19d 130d 0/26 upstream: reported C repro on 2023/12/18 14:44
android-44 INFO: task hung in addrconf_verify_work 3 2173d 2202d 0/2 auto-closed as invalid on 2019/02/22 14:29
upstream INFO: task hung in addrconf_verify_work (3) C done 75 1270d 1304d 15/26 fixed on 2020/11/16 12:12
upstream INFO: task hung in addrconf_verify_work (5) net C done done 68 848d 940d 0/26 closed as invalid on 2022/02/01 17:39
upstream INFO: task hung in addrconf_verify_work (7) netfilter C error 64 148d 295d 0/26 closed as invalid on 2023/12/01 14:19
linux-6.1 INFO: task hung in addrconf_verify_work 2 357d 408d 0/3 auto-obsoleted due to no activity on 2023/08/23 09:09
linux-4.14 INFO: task hung in addrconf_verify_work 4 1425d 1497d 0/1 auto-closed as invalid on 2020/09/29 04:19
upstream INFO: task hung in addrconf_verify_work net C 2 2222d 2223d 0/26 closed as invalid on 2018/03/27 11:14
upstream INFO: task hung in addrconf_verify_work (4) C done 132 1161d 1248d 20/26 fixed on 2021/04/09 19:46
upstream INFO: task hung in addrconf_verify_work (6) C done 86 430d 668d 22/26 fixed on 2023/02/24 13:51

Sample crash report:
device veth0_to_bridge entered promiscuous mode
device veth1_to_bridge entered promiscuous mode
device veth0_to_bond entered promiscuous mode
device veth1_to_bond entered promiscuous mode
device veth0_to_team entered promiscuous mode
INFO: task kworker/0:1:4310 blocked for more than 140 seconds.
      Not tainted 4.19.111-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/0:1     D29376  4310      2 0x80000000
Workqueue: ipv6_addrconf addrconf_verify_work
Call Trace:
 schedule+0x8d/0x1b0 kernel/sched/core.c:3559
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3617
 __mutex_lock_common kernel/locking/mutex.c:1002 [inline]
 __mutex_lock+0x726/0x1300 kernel/locking/mutex.c:1072
 addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4471
 process_one_work+0x91f/0x1640 kernel/workqueue.c:2155
 worker_thread+0x96/0xe20 kernel/workqueue.c:2298
 kthread+0x34a/0x420 kernel/kthread.c:246
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
INFO: task syz-executor.1:8251 blocked for more than 140 seconds.
      Not tainted 4.19.111-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1  D27056  8251   8062 0x00000004
Call Trace:
 schedule+0x8d/0x1b0 kernel/sched/core.c:3559
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3617
 __mutex_lock_common kernel/locking/mutex.c:1002 [inline]
 __mutex_lock+0x726/0x1300 kernel/locking/mutex.c:1072
 rtnl_lock net/core/rtnetlink.c:77 [inline]
 rtnetlink_rcv_msg+0x3fe/0xaf0 net/core/rtnetlink.c:4774
 netlink_rcv_skb+0x160/0x410 net/netlink/af_netlink.c:2455
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x4d7/0x6a0 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x80b/0xcd0 net/netlink/af_netlink.c:1909
 sock_sendmsg_nosec net/socket.c:622 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:632
 ___sys_sendmsg+0x3e2/0x920 net/socket.c:2115
 __sys_sendmmsg+0x195/0x470 net/socket.c:2210
 __do_sys_sendmmsg net/socket.c:2239 [inline]
 __se_sys_sendmmsg net/socket.c:2236 [inline]
 __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2236
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c849
Code: Bad RIP value.
RSP: 002b:00007ffa96e9fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007ffa96ea06d4 RCX: 000000000045c849
RDX: 0492492492492642 RSI: 0000000020000180 RDI: 0000000000000004
RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000008d2 R14: 00000000004cb75c R15: 000000000076bf0c
INFO: task syz-executor.5:8356 blocked for more than 140 seconds.
      Not tainted 4.19.111-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5  D28288  8356   8076 0x00000004
Call Trace:
 schedule+0x8d/0x1b0 kernel/sched/core.c:3559
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3617
 __mutex_lock_common kernel/locking/mutex.c:1002 [inline]
 __mutex_lock+0x726/0x1300 kernel/locking/mutex.c:1072
 tipc_nl_bearer_enable+0x13/0x30 net/tipc/bearer.c:903
 genl_family_rcv_msg+0x627/0xc10 net/netlink/genetlink.c:602
 genl_rcv_msg+0xbf/0x160 net/netlink/genetlink.c:627
 netlink_rcv_skb+0x160/0x410 net/netlink/af_netlink.c:2455
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:638
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x4d7/0x6a0 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x80b/0xcd0 net/netlink/af_netlink.c:1909
 sock_sendmsg_nosec net/socket.c:622 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:632
 ___sys_sendmsg+0x803/0x920 net/socket.c:2115
 __sys_sendmsg+0xec/0x1b0 net/socket.c:2153
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c849
Code: Bad RIP value.
RSP: 002b:00007fded9f91c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fded9f926d4 RCX: 000000000045c849
RDX: 0000000000000000 RSI: 00000000200002c0 RDI: 0000000000000003
RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000009d4 R14: 00000000004cc845 R15: 000000000076bf0c
INFO: task syz-executor.2:8359 blocked for more than 140 seconds.
device veth1_to_team entered promiscuous mode
      Not tainted 4.19.111-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2  D29600  8359   8065 0x00000004
Call Trace:
 schedule+0x8d/0x1b0 kernel/sched/core.c:3559
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3617
 __mutex_lock_common kernel/locking/mutex.c:1002 [inline]
 __mutex_lock+0x726/0x1300 kernel/locking/mutex.c:1072
 sock_do_ioctl+0x24e/0x2f0 net/socket.c:963
 sock_ioctl+0x325/0x610 net/socket.c:1074
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xcda/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: 0033:0x45c849
Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fc586ce2c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fc586ce36d4 RCX: 000000000045c849
RDX: 0000000000400200 RSI: 0000000000008912 RDI: 0000000000000004
RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000040d R14: 00000000004c6adf R15: 000000000076bf0c
INFO: task syz-executor.0:8361 blocked for more than 140 seconds.
      Not tainted 4.19.111-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0  D29552  8361   8056 0x00000004
Call Trace:
 schedule+0x8d/0x1b0 kernel/sched/core.c:3559
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3617
 __mutex_lock_common kernel/locking/mutex.c:1002 [inline]
 __mutex_lock+0x726/0x1300 kernel/locking/mutex.c:1072
 sock_do_ioctl+0x24e/0x2f0 net/socket.c:963
 sock_ioctl+0x325/0x610 net/socket.c:1074
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xcda/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: 0033:0x45c849
Code: Bad RIP value.
RSP: 002b:00007f8c18236c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f8c182376d4 RCX: 000000000045c849
RDX: 0000000000400200 RSI: 0000000000008912 RDI: 0000000000000005
RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000040d R14: 00000000004c6adf R15: 000000000076bf0c

Showing all locks held in the system:
4 locks held by kworker/u4:2/55:
1 lock held by khungtaskd/1080:
 #0: 00000000dbc93a22 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4436
3 locks held by kworker/0:2/2911:
 #0: 000000006247dfe0 ((wq_completion)"events"){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline]
 #0: 000000006247dfe0 ((wq_completion)"events"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: 000000006247dfe0 ((wq_completion)"events"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline]
 #0: 000000006247dfe0 ((wq_completion)"events"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline]
 #0: 000000006247dfe0 ((wq_completion)"events"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline]
 #0: 000000006247dfe0 ((wq_completion)"events"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline]
 #0: 000000006247dfe0 ((wq_completion)"events"){+.+.}, at: process_one_work+0x81a/0x1640 kernel/workqueue.c:2126
 #1: 00000000a33b2a5a ((linkwatch_work).work){+.+.}, at: process_one_work+0x84e/0x1640 kernel/workqueue.c:2130
 #2: 000000009b606fa1 (rtnl_mutex){+.+.}, at: linkwatch_event+0xb/0x60 net/core/link_watch.c:236
1 lock held by rsyslogd/7894:
 #0: 0000000031c87275 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xe3/0x100 fs/file.c:767
2 locks held by getty/8016:
 #0: 000000007ed3a202 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
 #1: 0000000073f736da (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1a50 drivers/tty/n_tty.c:2154
2 locks held by getty/8017:
 #0: 0000000069b00423 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
 #1: 0000000040e108c0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1a50 drivers/tty/n_tty.c:2154
2 locks held by getty/8018:
 #0: 0000000087afc894 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
 #1: 000000008630bb34 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1a50 drivers/tty/n_tty.c:2154
2 locks held by getty/8019:
 #0: 00000000f8d6774f (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
 #1: 00000000667cb7b1 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1a50 drivers/tty/n_tty.c:2154
2 locks held by getty/8020:
 #0: 00000000526d600e (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
 #1: 000000003e870c64 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1a50 drivers/tty/n_tty.c:2154
2 locks held by getty/8021:
 #0: 00000000d320b807 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
 #1: 00000000b7a07075 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1a50 drivers/tty/n_tty.c:2154
2 locks held by getty/8022:
 #0: 000000003f2cbf59 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
 #1: 000000004be3f3b2 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1a50 drivers/tty/n_tty.c:2154
2 locks held by syz-executor.0/17283:
 #0: 0000000081d862ab (&sb->s_type->i_mutex_key#11){+.+.}, at: inode_lock include/linux/fs.h:747 [inline]
 #0: 0000000081d862ab (&sb->s_type->i_mutex_key#11){+.+.}, at: __sock_release+0x86/0x2a0 net/socket.c:578
 #1: 000000009b606fa1 (rtnl_mutex){+.+.}, at: ip6mr_sk_done+0xe0/0x370 net/ipv6/ip6mr.c:1564
2 locks held by syz-executor.0/17352:
 #0: 000000000e980531 (&sb->s_type->i_mutex_key#11){+.+.}, at: inode_lock include/linux/fs.h:747 [inline]
 #0: 000000000e980531 (&sb->s_type->i_mutex_key#11){+.+.}, at: __sock_release+0x86/0x2a0 net/socket.c:578
 #1: 000000009b606fa1 (rtnl_mutex){+.+.}, at: ip6mr_sk_done+0xe0/0x370 net/ipv6/ip6mr.c:1564
2 locks held by syz-executor.0/17360:
 #0: 0000000057c46514 (&sb->s_type->i_mutex_key#11){+.+.}, at: inode_lock include/linux/fs.h:747 [inline]
 #0: 0000000057c46514 (&sb->s_type->i_mutex_key#11){+.+.}, at: __sock_release+0x86/0x2a0 net/socket.c:578
 #1: 000000009b606fa1 (rtnl_mutex){+.+.}, at: ip6mr_sk_done+0xe0/0x370 net/ipv6/ip6mr.c:1564
2 locks held by syz-executor.4/17384:
 #0: 00000000aaef8941 (&sb->s_type->i_mutex_key#11){+.+.}, at: inode_lock include/linux/fs.h:747 [inline]
 #0: 00000000aaef8941 (&sb->s_type->i_mutex_key#11){+.+.}, at: __sock_release+0x86/0x2a0 net/socket.c:578
 #1: 000000009b606fa1 (rtnl_mutex){+.+.}, at: ip6mr_sk_done+0xe0/0x370 net/ipv6/ip6mr.c:1564
2 locks held by syz-executor.4/17406:
 #0: 00000000f71320f8 (&sb->s_type->i_mutex_key#11){+.+.}, at: inode_lock include/linux/fs.h:747 [inline]
 #0: 00000000f71320f8 (&sb->s_type->i_mutex_key#11){+.+.}, at: __sock_release+0x86/0x2a0 net/socket.c:578
 #1: 000000009b606fa1 (rtnl_mutex){+.+.}, at: ip6mr_sk_done+0xe0/0x370 net/ipv6/ip6mr.c:1564
2 locks held by syz-executor.1/17429:
 #0: 0000000001f948d3 (&sb->s_type->i_mutex_key#11){+.+.}, at: inode_lock include/linux/fs.h:747 [inline]
 #0: 0000000001f948d3 (&sb->s_type->i_mutex_key#11){+.+.}, at: __sock_release+0x86/0x2a0 net/socket.c:578
 #1: 000000009b606fa1 (rtnl_mutex){+.+.}, at: ip6mr_sk_done+0xe0/0x370 net/ipv6/ip6mr.c:1564
2 locks held by syz-executor.4/17436:
 #0: 000000004fa7b108 (&sb->s_type->i_mutex_key#11){+.+.}, at: inode_lock include/linux/fs.h:747 [inline]
 #0: 000000004fa7b108 (&sb->s_type->i_mutex_key#11){+.+.}, at: __sock_release+0x86/0x2a0 net/socket.c:578
 #1: 000000009b606fa1 (rtnl_mutex){+.+.}, at: ip6mr_sk_done+0xe0/0x370 net/ipv6/ip6mr.c:1564
2 locks held by syz-executor.5/17449:
 #0: 00000000deb6d95d (&sb->s_type->i_mutex_key#11){+.+.}, at: inode_lock include/linux/fs.h:747 [inline]
 #0: 00000000deb6d95d (&sb->s_type->i_mutex_key#11){+.+.}, at: __sock_release+0x86/0x2a0 net/socket.c:578
 #1: 000000009b606fa1 (rtnl_mutex){+.+.}, at: ip6mr_sk_done+0xe0/0x370 net/ipv6/ip6mr.c:1564
2 locks held by syz-executor.1/17463:
 #0: 00000000dacb83a4 (&sb->s_type->i_mutex_key#11){+.+.}, at: inode_lock include/linux/fs.h:747 [inline]
 #0: 00000000dacb83a4 (&sb->s_type->i_mutex_key#11){+.+.}, at: __sock_release+0x86/0x2a0 net/socket.c:578
 #1: 000000009b606fa1 (rtnl_mutex){+.+.}, at: ip6mr_sk_done+0xe0/0x370 net/ipv6/ip6mr.c:1564
2 locks held by syz-executor.1/17478:
 #0: 00000000eb9cddbd (&sb->s_type->i_mutex_key#11){+.+.}, at: inode_lock include/linux/fs.h:747 [inline]
 #0: 00000000eb9cddbd (&sb->s_type->i_mutex_key#11){+.+.}, at: __sock_release+0x86/0x2a0 net/socket.c:578
 #1: 000000009b606fa1 (rtnl_mutex){+.+.}, at: ip6mr_sk_done+0xe0/0x370 net/ipv6/ip6mr.c:1564
2 locks held by syz-executor.2/17486:
 #0: 00000000fa0e0d09 (&sb->s_type->i_mutex_key#11){+.+.}, at: inode_lock include/linux/fs.h:747 [inline]
 #0: 00000000fa0e0d09 (&sb->s_type->i_mutex_key#11){+.+.}, at: __sock_release+0x86/0x2a0 net/socket.c:578
 #1: 000000009b606fa1 (rtnl_mutex){+.+.}, at: ip6mr_sk_done+0xe0/0x370 net/ipv6/ip6mr.c:1564
2 locks held by syz-executor.5/17537:
 #0: 00000000315db0df (&sb->s_type->i_mutex_key#11){+.+.}, at: inode_lock include/linux/fs.h:747 [inline]
 #0: 00000000315db0df (&sb->s_type->i_mutex_key#11){+.+.}, at: __sock_release+0x86/0x2a0 net/socket.c:578
 #1: 000000009b606fa1 (rtnl_mutex){+.+.}, at: ip6mr_sk_done+0xe0/0x370 net/ipv6/ip6mr.c:1564
2 locks held by syz-executor.1/17540:
 #0: 0000000087133e31 (&sb->s_type->i_mutex_key#11){+.+.}, at: inode_lock include/linux/fs.h:747 [inline]
 #0: 0000000087133e31 (&sb->s_type->i_mutex_key#11){+.+.}, at: __sock_release+0x86/0x2a0 net/socket.c:578
 #1: 000000009b606fa1 (rtnl_mutex){+.+.}, at: ip6mr_sk_done+0xe0/0x370 net/ipv6/ip6mr.c:1564
2 locks held by syz-executor.5/17561:
 #0: 00000000fc57854d (&sb->s_type->i_mutex_key#11){+.+.}, at: inode_lock include/linux/fs.h:747 [inline]
 #0: 00000000fc57854d (&sb->s_type->i_mutex_key#11){+.+.}, at: __sock_release+0x86/0x2a0 net/socket.c:578
 #1: 000000009b606fa1 (rtnl_mutex){+.+.}, at: ip6mr_sk_done+0xe0/0x370 net/ipv6/ip6mr.c:1564
1 lock held by syz-executor.0/18055:
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:751 [inline]
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3261
1 lock held by syz-executor.0/18070:
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:751 [inline]
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3261
1 lock held by syz-executor.0/18111:
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:751 [inline]
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3261
1 lock held by syz-executor.5/18112:
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:751 [inline]
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3261
1 lock held by syz-executor.5/18130:
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:751 [inline]
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3261
1 lock held by syz-executor.0/18131:
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:751 [inline]
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3261
1 lock held by syz-executor.1/18134:
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:751 [inline]
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3261
1 lock held by syz-executor.4/18145:
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:751 [inline]
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3261
1 lock held by syz-executor.5/18150:
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:751 [inline]
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3261
1 lock held by syz-executor.0/18154:
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:751 [inline]
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3261
1 lock held by syz-executor.1/18159:
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:751 [inline]
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3261
1 lock held by syz-executor.4/18169:
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:751 [inline]
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3261
1 lock held by syz-executor.5/18175:
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:751 [inline]
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3261
1 lock held by syz-executor.0/18183:
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:751 [inline]
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3261
1 lock held by syz-executor.1/18185:
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:751 [inline]
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3261
1 lock held by syz-executor.5/18191:
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:751 [inline]
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3261
1 lock held by syz-executor.0/18194:
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:751 [inline]
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3261
1 lock held by syz-executor.1/18207:
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:751 [inline]
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3261
1 lock held by syz-executor.5/18214:
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:751 [inline]
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3261
1 lock held by syz-executor.0/18218:
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:751 [inline]
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3261
1 lock held by syz-executor.4/18223:
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:751 [inline]
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3261
1 lock held by syz-executor.4/18234:
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:751 [inline]
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3261
1 lock held by syz-executor.0/18237:
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:751 [inline]
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3261
1 lock held by syz-executor.4/18252:
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:751 [inline]
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3261
2 locks held by syz-executor.2/9733:
 #0: 00000000af6e5487 (&sb->s_type->i_mutex_key#11){+.+.}, at: inode_lock include/linux/fs.h:747 [inline]
 #0: 00000000af6e5487 (&sb->s_type->i_mutex_key#11){+.+.}, at: __sock_release+0x86/0x2a0 net/socket.c:578
 #1: 000000009b606fa1 (rtnl_mutex){+.+.}, at: ip6mr_sk_done+0xe0/0x370 net/ipv6/ip6mr.c:1564
2 locks held by syz-executor.4/10498:
 #0: 00000000fe1bd0ec (&sb->s_type->i_mutex_key#11){+.+.}, at: inode_lock include/linux/fs.h:747 [inline]
 #0: 00000000fe1bd0ec (&sb->s_type->i_mutex_key#11){+.+.}, at: __sock_release+0x86/0x2a0 net/socket.c:578
 #1: 000000009b606fa1 (rtnl_mutex){+.+.}, at: ip6mr_sk_done+0xe0/0x370 net/ipv6/ip6mr.c:1564
2 locks held by syz-executor.1/10533:
 #0: 00000000d525a546 (&sb->s_type->i_mutex_key#11){+.+.}, at: inode_lock include/linux/fs.h:747 [inline]
 #0: 00000000d525a546 (&sb->s_type->i_mutex_key#11){+.+.}, at: __sock_release+0x86/0x2a0 net/socket.c:578
 #1: 000000009b606fa1 (rtnl_mutex){+.+.}, at: ip6mr_sk_done+0xe0/0x370 net/ipv6/ip6mr.c:1564
2 locks held by syz-executor.2/10607:
 #0: 00000000cce6d896 (&sb->s_type->i_mutex_key#11){+.+.}, at: inode_lock include/linux/fs.h:747 [inline]
 #0: 00000000cce6d896 (&sb->s_type->i_mutex_key#11){+.+.}, at: __sock_release+0x86/0x2a0 net/socket.c:578
 #1: 000000009b606fa1 (rtnl_mutex){+.+.}, at: ip6mr_sk_done+0xe0/0x370 net/ipv6/ip6mr.c:1564
3 locks held by kworker/0:1/4310:
 #0: 00000000631c5776 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline]
 #0: 00000000631c5776 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: 00000000631c5776 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline]
 #0: 00000000631c5776 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline]
 #0: 00000000631c5776 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline]
 #0: 00000000631c5776 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline]
 #0: 00000000631c5776 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: process_one_work+0x81a/0x1640 kernel/workqueue.c:2126
 #1: 0000000059dbfc23 ((addr_chk_work).work){+.+.}, at: process_one_work+0x84e/0x1640 kernel/workqueue.c:2130
 #2: 000000009b606fa1 (rtnl_mutex){+.+.}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4471
2 locks held by syz-executor.4/8249:
1 lock held by syz-executor.1/8251:
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: rtnl_lock net/core/rtnetlink.c:77 [inline]
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x3fe/0xaf0 net/core/rtnetlink.c:4774
3 locks held by syz-executor.5/8356:
 #0: 00000000d0c2432c (cb_lock){++++}, at: genl_rcv+0x15/0x40 net/netlink/genetlink.c:637
 #1: 000000005cea58d6 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline]
 #1: 000000005cea58d6 (genl_mutex){+.+.}, at: genl_rcv_msg+0x12f/0x160 net/netlink/genetlink.c:625
 #2: 000000009b606fa1 (rtnl_mutex){+.+.}, at: tipc_nl_bearer_enable+0x13/0x30 net/tipc/bearer.c:903
1 lock held by syz-executor.2/8359:
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: sock_do_ioctl+0x24e/0x2f0 net/socket.c:963
1 lock held by syz-executor.0/8361:
 #0: 000000009b606fa1 (rtnl_mutex){+.+.}, at: sock_do_ioctl+0x24e/0x2f0 net/socket.c:963
2 locks held by kworker/0:3/8708:
 #0: 00000000022f75a8 ((wq_completion)"rcu_gp"){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline]
 #0: 00000000022f75a8 ((wq_completion)"rcu_gp"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: 00000000022f75a8 ((wq_completion)"rcu_gp"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline]
 #0: 00000000022f75a8 ((wq_completion)"rcu_gp"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline]
 #0: 00000000022f75a8 ((wq_completion)"rcu_gp"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline]
 #0: 00000000022f75a8 ((wq_completion)"rcu_gp"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline]
 #0: 00000000022f75a8 ((wq_completion)"rcu_gp"){+.+.}, at: process_one_work+0x81a/0x1640 kernel/workqueue.c:2126
 #1: 00000000392a41a6 ((work_completion)(&rew.rew_work)){+.+.}, at: process_one_work+0x84e/0x1640 kernel/workqueue.c:2130

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 1080 Comm: khungtaskd Not tainted 4.19.111-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x188/0x20d 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_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline]
 watchdog+0x962/0xe40 kernel/hung_task.c:287
 kthread+0x34a/0x420 kernel/kthread.c:246
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 8249 Comm: syz-executor.4 Not tainted 4.19.111-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_acquire+0x1ec/0x400 kernel/locking/lockdep.c:3906
Code: 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 cd 01 00 00 48 83 3d b9 a5 62 07 00 0f 84 38 01 00 00 48 8b 7c 24 08 57 9d <0f> 1f 44 00 00 48 83 c4 20 5b 5d 41 5c 41 5d 41 5e 41 5f c3 65 8b
RSP: 0018:ffff8880ae607cb8 EFLAGS: 00000086
RAX: 1ffffffff1164ad1 RBX: ffff8880a8b603c0 RCX: 00000000ca87c5c9
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000086
RBP: ffffffff8b8e2320 R08: 0000000000007be6 R09: 0000000000000003
R10: ffff8880a8b60cb8 R11: ffffffff8b1e36b0 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88807ffe6f18
FS:  00007fa38fed7700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffff600400 CR3: 000000008a5eb000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x8c/0xbf kernel/locking/spinlock.c:152
 debug_object_deactivate lib/debugobjects.c:540 [inline]
 debug_object_deactivate+0x104/0x360 lib/debugobjects.c:529
 debug_hrtimer_deactivate kernel/time/hrtimer.c:421 [inline]
 debug_deactivate kernel/time/hrtimer.c:471 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1371 [inline]
 __hrtimer_run_queues+0x1a2/0xd50 kernel/time/hrtimer.c:1463
 hrtimer_interrupt+0x312/0x770 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:893
 </IRQ>
RIP: 0010:get_next_corpse net/netfilter/nf_conntrack_core.c:1920 [inline]
RIP: 0010:nf_ct_iterate_cleanup+0x33f/0x4b0 net/netfilter/nf_conntrack_core.c:1951
Code: 10 9d fb 48 8d 7d 37 48 89 f8 48 89 fa 48 c1 e8 03 83 e2 07 42 0f b6 04 30 38 d0 7f 08 84 c0 0f 85 fd 00 00 00 44 0f b6 6d 37 <31> ff 44 89 ee e8 87 11 9d fb 45 84 ed 75 90 e8 4d 10 9d fb 4c 8d
RSP: 0018:ffff888054f4eb68 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 00000000000018b4 RCX: ffffc9000e6da000
RDX: 0000000000000007 RSI: ffffffff85ca9418 RDI: ffff888064dae1ff
RBP: ffff888064dae1c8 R08: ffff8880a8b603c0 R09: fffffbfff114ba45
R10: fffffbfff114ba44 R11: ffffffff88a5d223 R12: ffffffff88a5d220
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
 nf_ct_iterate_cleanup_net net/netfilter/nf_conntrack_core.c:2036 [inline]
 nf_ct_iterate_cleanup_net+0x113/0x170 net/netfilter/nf_conntrack_core.c:2021
 masq_device_event+0xd6/0x110 net/ipv4/netfilter/nf_nat_masquerade_ipv4.c:100
 notifier_call_chain+0xc0/0x230 kernel/notifier.c:93
 call_netdevice_notifiers net/core/dev.c:1766 [inline]
 __dev_notify_flags+0x1e9/0x2c0 net/core/dev.c:7703
 dev_change_flags+0xf0/0x140 net/core/dev.c:7737
 do_setlink+0x1601/0x3510 net/core/rtnetlink.c:2449
 rtnl_group_changelink net/core/rtnetlink.c:2925 [inline]
 rtnl_newlink+0xc7e/0x1440 net/core/rtnetlink.c:3083
 rtnetlink_rcv_msg+0x453/0xaf0 net/core/rtnetlink.c:4777
 netlink_rcv_skb+0x160/0x410 net/netlink/af_netlink.c:2455
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x4d7/0x6a0 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x80b/0xcd0 net/netlink/af_netlink.c:1909
 sock_sendmsg_nosec net/socket.c:622 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:632
 ___sys_sendmsg+0x803/0x920 net/socket.c:2115
 __sys_sendmsg+0xec/0x1b0 net/socket.c:2153
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c849
Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fa38fed6c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fa38fed76d4 RCX: 000000000045c849
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000004
RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000009f8 R14: 00000000004ccb00 R15: 000000000076bf0c

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/03/18 23:17 linux-4.19.y 93556fb211fa 2c31c529 .config console log report ci2-linux-4-19
* Struck through repros no longer work on HEAD.