syzbot


INFO: task hung in fsnotify_connector_destroy_workfn

Status: auto-closed as invalid on 2020/03/18 16:55
Reported-by: syzbot+c239344298de1b3e6800@syzkaller.appspotmail.com
First crash: 2094d, last: 1671d
Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 INFO: task hung in fsnotify_connector_destroy_workfn 1 1883d 1883d 0/1 auto-closed as invalid on 2019/10/19 09:18
upstream INFO: task hung in fsnotify_connector_destroy_workfn fs syz 7 2155d 2234d 0/27 closed as dup on 2018/07/18 14:05
upstream INFO: task hung in fsnotify_connector_destroy_workfn (2) fs syz error error 62 1469d 2102d 0/27 auto-obsoleted due to no activity on 2022/09/20 11:34
linux-4.19 INFO: task hung in fsnotify_connector_destroy_workfn (2) 2 1504d 1522d 0/1 auto-closed as invalid on 2020/09/02 10:35

Sample crash report:
ip6_tunnel:  xmit: Local address not yet configured!
ip6_tunnel:  xmit: Local address not yet configured!
ip6_tunnel: { xmit: Local address not yet configured!
ip6_tunnel:  xmit: Local address not yet configured!
INFO: task kworker/u4:22:6702 blocked for more than 140 seconds.
ip6_tunnel:  xmit: Local address not yet configured!
      Not tainted 4.14.154+ #0
ip6_tunnel: " xmit: Local address not yet configured!
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/u4:22   D26416  6702      2 0x80000000
Workqueue: events_unbound fsnotify_connector_destroy_workfn
Call Trace:
 schedule+0x92/0x1c0 kernel/sched/core.c:3499
 schedule_timeout+0x752/0xe90 kernel/time/timer.c:1723
 do_wait_for_common kernel/sched/completion.c:91 [inline]
 __wait_for_common kernel/sched/completion.c:112 [inline]
 wait_for_common+0x29c/0x470 kernel/sched/completion.c:123
 __synchronize_srcu+0x12a/0x210 kernel/rcu/srcutree.c:898
 fsnotify_connector_destroy_workfn+0x49/0xa0 fs/notify/mark.c:156
 process_one_work+0x7f1/0x1580 kernel/workqueue.c:2134
 worker_thread+0xdd/0xdf0 kernel/workqueue.c:2271
 kthread+0x31f/0x430 kernel/kthread.c:232
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:404
INFO: task kworker/u4:13:11619 blocked for more than 140 seconds.
      Not tainted 4.14.154+ #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/u4:13   D27728 11619      2 0x80000000
Workqueue: events_unbound fsnotify_mark_destroy_workfn
Call Trace:
 schedule+0x92/0x1c0 kernel/sched/core.c:3499
 schedule_timeout+0x752/0xe90 kernel/time/timer.c:1723
 do_wait_for_common kernel/sched/completion.c:91 [inline]
 __wait_for_common kernel/sched/completion.c:112 [inline]
 wait_for_common+0x29c/0x470 kernel/sched/completion.c:123
 __synchronize_srcu+0x12a/0x210 kernel/rcu/srcutree.c:898
 fsnotify_mark_destroy_workfn+0xfd/0x310 fs/notify/mark.c:757
 process_one_work+0x7f1/0x1580 kernel/workqueue.c:2134
 worker_thread+0xdd/0xdf0 kernel/workqueue.c:2271
 kthread+0x31f/0x430 kernel/kthread.c:232
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:404
INFO: task syz-executor.1:13877 blocked for more than 140 seconds.
      Not tainted 4.14.154+ #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1  D29344 13877  27666 0x00000004
Call Trace:
 schedule+0x92/0x1c0 kernel/sched/core.c:3499
 _synchronize_rcu_expedited+0x5a8/0x840 kernel/rcu/tree_exp.h:615
 synchronize_net+0x2b/0x40 net/core/dev.c:8222
 dev_deactivate_many+0x3cf/0x980 net/sched/sch_generic.c:935
 __dev_close_many+0x10a/0x260 net/core/dev.c:1441
 __dev_close net/core/dev.c:1466 [inline]
 __dev_change_flags+0x217/0x540 net/core/dev.c:6794
 dev_change_flags+0x7e/0x130 net/core/dev.c:6862
 devinet_ioctl+0xa03/0x1610 net/ipv4/devinet.c:1083
 inet_ioctl+0xd4/0x1d0 net/ipv4/af_inet.c:898
 sock_do_ioctl+0x65/0xb0 net/socket.c:974
 sock_ioctl+0x253/0x440 net/socket.c:1071
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0xabe/0x1040 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45a639
RSP: 002b:00007ff311fd7c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a639
RDX: 0000000020000000 RSI: 0000000000008914 RDI: 0000000000000007
RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff311fd86d4
R13: 00000000004c6976 R14: 00000000004dbd90 R15: 00000000ffffffff
INFO: task syz-executor.1:13879 blocked for more than 140 seconds.
      Not tainted 4.14.154+ #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1  D28816 13879  27666 0x00000004
Call Trace:
 schedule+0x92/0x1c0 kernel/sched/core.c:3499
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3557
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x595/0x13e0 kernel/locking/mutex.c:893
 dev_ioctl+0x3de/0xdf0 net/core/dev_ioctl.c:565
 sock_do_ioctl+0x92/0xb0 net/socket.c:981
 sock_ioctl+0x253/0x440 net/socket.c:1071
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0xabe/0x1040 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45a639
RSP: 002b:00007ff311f95c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a639
RDX: 0000000020000040 RSI: 0000000000008914 RDI: 0000000000000009
RBP: 000000000075c1c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff311f966d4
R13: 00000000004c6976 R14: 00000000004dbd90 R15: 00000000ffffffff
INFO: task syz-executor.5:13842 blocked for more than 140 seconds.
      Not tainted 4.14.154+ #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5  D29008 13842  31833 0x00000004
Call Trace:
 schedule+0x92/0x1c0 kernel/sched/core.c:3499
 schedule_timeout+0x752/0xe90 kernel/time/timer.c:1723
 do_wait_for_common kernel/sched/completion.c:91 [inline]
 __wait_for_common kernel/sched/completion.c:112 [inline]
 wait_for_common+0x29c/0x470 kernel/sched/completion.c:123
 flush_work+0x3e2/0x720 kernel/workqueue.c:2908
 fsnotify_destroy_group+0x131/0x2f0 fs/notify/group.c:85
 inotify_release+0x33/0x40 fs/notify/inotify/inotify_user.c:280
 __fput+0x25e/0x710 fs/file_table.c:210
 task_work_run+0x125/0x1a0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x13b/0x160 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x3a3/0x520 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4141d1
RSP: 002b:00007ffd93968010 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00000000004141d1
RDX: 0000001b31420000 RSI: 0000001b31422650 RDI: 0000000000000003
RBP: 0000000000000001 R08: 0000000001f11437 R09: 0000000001f1143b
R10: 00007ffd939680f0 R11: 0000000000000293 R12: 000000000075c9a0
R13: 000000000075c9a0 R14: 0000000000760370 R15: 000000000075bfd4
INFO: task syz-executor.4:13875 blocked for more than 140 seconds.
      Not tainted 4.14.154+ #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4  D26496 13875  25443 0x00000004
Call Trace:
 schedule+0x92/0x1c0 kernel/sched/core.c:3499
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3557
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x595/0x13e0 kernel/locking/mutex.c:893
 __netlink_dump_start+0x100/0x750 net/netlink/af_netlink.c:2265
 netlink_dump_start include/linux/netlink.h:217 [inline]
 rtnetlink_rcv_msg+0x5b0/0xb40 net/core/rtnetlink.c:4255
 netlink_rcv_skb+0x137/0x3a0 net/netlink/af_netlink.c:2432
 netlink_unicast_kernel net/netlink/af_netlink.c:1286 [inline]
 netlink_unicast+0x478/0x650 net/netlink/af_netlink.c:1312
 netlink_sendmsg+0x66a/0xbe0 net/netlink/af_netlink.c:1877
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb7/0x100 net/socket.c:656
 SYSC_sendto net/socket.c:1763 [inline]
 SyS_sendto+0x1de/0x2f0 net/socket.c:1731
 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45a639
RSP: 002b:00007f3ac047fc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 000000000045a639
RDX: 000000000000fcd1 RSI: 0000000020000000 RDI: 0000000000000007
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3ac04806d4
R13: 00000000004c8c01 R14: 00000000004df258 R15: 00000000ffffffff
INFO: task syz-executor.4:13893 blocked for more than 140 seconds.
      Not tainted 4.14.154+ #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4  D27760 13893  25443 0x00000004
Call Trace:
 schedule+0x92/0x1c0 kernel/sched/core.c:3499
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3557
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x595/0x13e0 kernel/locking/mutex.c:893
 __netlink_dump_start+0x100/0x750 net/netlink/af_netlink.c:2265
 netlink_dump_start include/linux/netlink.h:217 [inline]
 rtnetlink_rcv_msg+0x5b0/0xb40 net/core/rtnetlink.c:4255
 netlink_rcv_skb+0x137/0x3a0 net/netlink/af_netlink.c:2432
 netlink_unicast_kernel net/netlink/af_netlink.c:1286 [inline]
 netlink_unicast+0x478/0x650 net/netlink/af_netlink.c:1312
 netlink_sendmsg+0x66a/0xbe0 net/netlink/af_netlink.c:1877
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb7/0x100 net/socket.c:656
 SYSC_sendto net/socket.c:1763 [inline]
 SyS_sendto+0x1de/0x2f0 net/socket.c:1731
 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45a639
RSP: 002b:00007f3ac041cc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 000000000045a639
RDX: 000000000000fcd1 RSI: 0000000020000000 RDI: 0000000000000007
RBP: 000000000075c118 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3ac041d6d4
R13: 00000000004c8c01 R14: 00000000004df258 R15: 00000000ffffffff
INFO: task syz-executor.0:13900 blocked for more than 140 seconds.
      Not tainted 4.14.154+ #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0  D29792 13900   9686 0x00000004
Call Trace:
 schedule+0x92/0x1c0 kernel/sched/core.c:3499
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3557
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x595/0x13e0 kernel/locking/mutex.c:893
 dev_ioctl+0x531/0xdf0 net/core/dev_ioctl.c:421
 sock_do_ioctl+0x92/0xb0 net/socket.c:981
 sock_ioctl+0x253/0x440 net/socket.c:1071
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0xabe/0x1040 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45a639
RSP: 002b:00007f858cb43c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a639
RDX: 0000000000400200 RSI: 0000000000008912 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f858cb446d4
R13: 00000000004c433e R14: 00000000004d8718 R15: 00000000ffffffff
INFO: task syz-executor.0:13911 blocked for more than 140 seconds.
      Not tainted 4.14.154+ #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0  D29296 13911   9686 0x00000004
Call Trace:
 schedule+0x92/0x1c0 kernel/sched/core.c:3499
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3557
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x595/0x13e0 kernel/locking/mutex.c:893
 dev_ioctl+0x531/0xdf0 net/core/dev_ioctl.c:421
 sock_do_ioctl+0x92/0xb0 net/socket.c:981
 sock_ioctl+0x253/0x440 net/socket.c:1071
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0xabe/0x1040 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45a639
RSP: 002b:00007f858cb01c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a639
RDX: 0000000000400200 RSI: 0000000000008912 RDI: 0000000000000003
RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f858cb026d4
R13: 00000000004c433e R14: 00000000004d8718 R15: 00000000ffffffff
INFO: task syz-executor.2:13899 blocked for more than 140 seconds.
      Not tainted 4.14.154+ #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2  D29008 13899  12149 0x00000004
Call Trace:
 schedule+0x92/0x1c0 kernel/sched/core.c:3499
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3557
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x595/0x13e0 kernel/locking/mutex.c:893
 exp_funnel_lock kernel/rcu/tree_exp.h:305 [inline]
 _synchronize_rcu_expedited+0x377/0x840 kernel/rcu/tree_exp.h:596
 synchronize_net+0x2b/0x40 net/core/dev.c:8222
 packet_release+0x7ae/0xb80 net/packet/af_packet.c:3074
 __sock_release+0xd2/0x2c0 net/socket.c:602
 sock_close+0x15/0x20 net/socket.c:1139
 __fput+0x25e/0x710 fs/file_table.c:210
 task_work_run+0x125/0x1a0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x13b/0x160 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x3a3/0x520 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4141d1
RSP: 002b:00007ffe15c72bf0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 000000000000000b RCX: 00000000004141d1
RDX: 0000000000000000 RSI: 0000000000001041 RDI: 000000000000000a
RBP: 0000000000000001 R08: 000000000b1f9041 R09: 000000000b1f9045
R10: 00007ffe15c72cd0 R11: 0000000000000293 R12: 000000000075c9a0
R13: 000000000075c9a0 R14: 0000000000762400 R15: 000000000075c07c

Showing all locks held in the system:
1 lock held by khungtaskd/23:
 #0:  (tasklist_lock){.+.+}, at: [<00000000ef60153a>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4544
2 locks held by getty/1769:
 #0:  (&tty->ldisc_sem){++++}, at: [<000000002e0460ab>] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<00000000e4ac413c>] n_tty_read+0x1f7/0x1700 drivers/tty/n_tty.c:2156
4 locks held by kworker/u4:14/2920:
 #0:  ("%s""netns"){+.+.}, at: [<0000000073b1c613>] process_one_work+0x6ff/0x1580 kernel/workqueue.c:2105
 #1:  (net_cleanup_work){+.+.}, at: [<000000009b669b83>] process_one_work+0x735/0x1580 kernel/workqueue.c:2109
 #2:  (net_mutex){+.+.}, at: [<00000000b1838fb4>] cleanup_net+0x136/0x870 net/core/net_namespace.c:450
 #3:  (rtnl_mutex){+.+.}, at: [<00000000eb770029>] cleanup_net+0x13b/0x870 net/core/net_namespace.c:453
2 locks held by kworker/u4:22/6702:
 #0:  ("events_unbound"){+.+.}, at: [<0000000073b1c613>] process_one_work+0x6ff/0x1580 kernel/workqueue.c:2105
 #1:  (connector_reaper_work){+.+.}, at: [<000000009b669b83>] process_one_work+0x735/0x1580 kernel/workqueue.c:2109
1 lock held by syz-executor.4/15247:
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] inode_lock include/linux/fs.h:724 [inline]
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] __sock_release+0x86/0x2c0 net/socket.c:601
1 lock held by syz-executor.0/28978:
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] inode_lock include/linux/fs.h:724 [inline]
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] __sock_release+0x86/0x2c0 net/socket.c:601
1 lock held by syz-executor.0/28984:
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] inode_lock include/linux/fs.h:724 [inline]
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] __sock_release+0x86/0x2c0 net/socket.c:601
1 lock held by syz-executor.5/32522:
 #0:  (rtnl_mutex){+.+.}, at: [<000000002e119a4a>] tun_detach drivers/net/tun.c:585 [inline]
 #0:  (rtnl_mutex){+.+.}, at: [<000000002e119a4a>] tun_chr_close+0x34/0x60 drivers/net/tun.c:2660
1 lock held by syz-executor.5/32540:
 #0:  (rtnl_mutex){+.+.}, at: [<000000002e119a4a>] tun_detach drivers/net/tun.c:585 [inline]
 #0:  (rtnl_mutex){+.+.}, at: [<000000002e119a4a>] tun_chr_close+0x34/0x60 drivers/net/tun.c:2660
1 lock held by syz-executor.5/324:
 #0:  (&rtc->ops_lock){+.+.}, at: [<00000000d9822d86>] rtc_dev_ioctl+0xe6/0x7e0 drivers/rtc/rtc-dev.c:219
2 locks held by syz-executor.5/582:
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] inode_lock include/linux/fs.h:724 [inline]
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] __sock_release+0x86/0x2c0 net/socket.c:601
 #1:  (rtnl_mutex){+.+.}, at: [<00000000dc1d7036>] raw_close+0xe/0x30 net/ipv4/raw.c:699
2 locks held by syz-executor.1/974:
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] inode_lock include/linux/fs.h:724 [inline]
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] __sock_release+0x86/0x2c0 net/socket.c:601
 #1:  (rtnl_mutex){+.+.}, at: [<00000000dc1d7036>] raw_close+0xe/0x30 net/ipv4/raw.c:699
2 locks held by syz-executor.1/1008:
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] inode_lock include/linux/fs.h:724 [inline]
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] __sock_release+0x86/0x2c0 net/socket.c:601
 #1:  (rtnl_mutex){+.+.}, at: [<00000000dc1d7036>] raw_close+0xe/0x30 net/ipv4/raw.c:699
1 lock held by syz-executor.1/2424:
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] inode_lock include/linux/fs.h:724 [inline]
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] __sock_release+0x86/0x2c0 net/socket.c:601
1 lock held by syz-executor.2/5941:
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] inode_lock include/linux/fs.h:724 [inline]
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] __sock_release+0x86/0x2c0 net/socket.c:601
1 lock held by syz-executor.2/5960:
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] inode_lock include/linux/fs.h:724 [inline]
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] __sock_release+0x86/0x2c0 net/socket.c:601
1 lock held by syz-executor.5/6671:
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] inode_lock include/linux/fs.h:724 [inline]
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] __sock_release+0x86/0x2c0 net/socket.c:601
1 lock held by syz-executor.5/6722:
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] inode_lock include/linux/fs.h:724 [inline]
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] __sock_release+0x86/0x2c0 net/socket.c:601
1 lock held by syz-executor.2/8496:
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] inode_lock include/linux/fs.h:724 [inline]
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] __sock_release+0x86/0x2c0 net/socket.c:601
1 lock held by syz-executor.2/8531:
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] inode_lock include/linux/fs.h:724 [inline]
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] __sock_release+0x86/0x2c0 net/socket.c:601
1 lock held by syz-executor.1/8659:
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] inode_lock include/linux/fs.h:724 [inline]
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] __sock_release+0x86/0x2c0 net/socket.c:601
1 lock held by syz-executor.2/10711:
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] inode_lock include/linux/fs.h:724 [inline]
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] __sock_release+0x86/0x2c0 net/socket.c:601
2 locks held by kworker/u4:13/11619:
 #0:  ("events_unbound"){+.+.}, at: [<0000000073b1c613>] process_one_work+0x6ff/0x1580 kernel/workqueue.c:2105
 #1:  ((reaper_work).work){+.+.}, at: [<000000009b669b83>] process_one_work+0x735/0x1580 kernel/workqueue.c:2109
1 lock held by syz-executor.4/12632:
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] inode_lock include/linux/fs.h:724 [inline]
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] __sock_release+0x86/0x2c0 net/socket.c:601
2 locks held by syz-executor.1/13877:
 #0:  (rtnl_mutex){+.+.}, at: [<00000000a67e6ed4>] devinet_ioctl+0x18a/0x1610 net/ipv4/devinet.c:1014
 #1:  (rcu_preempt_state.exp_mutex){+.+.}, at: [<0000000068736495>] exp_funnel_lock kernel/rcu/tree_exp.h:272 [inline]
 #1:  (rcu_preempt_state.exp_mutex){+.+.}, at: [<0000000068736495>] _synchronize_rcu_expedited+0x308/0x840 kernel/rcu/tree_exp.h:596
1 lock held by syz-executor.1/13879:
 #0:  (rtnl_mutex){+.+.}, at: [<000000004e1af617>] dev_ioctl+0x3de/0xdf0 net/core/dev_ioctl.c:565
1 lock held by syz-executor.4/13875:
 #0:  (rtnl_mutex){+.+.}, at: [<0000000023d76556>] __netlink_dump_start+0x100/0x750 net/netlink/af_netlink.c:2265
1 lock held by syz-executor.4/13893:
 #0:  (rtnl_mutex){+.+.}, at: [<0000000023d76556>] __netlink_dump_start+0x100/0x750 net/netlink/af_netlink.c:2265
1 lock held by syz-executor.0/13900:
 #0:  (rtnl_mutex){+.+.}, at: [<0000000064ff9b02>] dev_ioctl+0x531/0xdf0 net/core/dev_ioctl.c:421
1 lock held by syz-executor.0/13911:
 #0:  (rtnl_mutex){+.+.}, at: [<0000000064ff9b02>] dev_ioctl+0x531/0xdf0 net/core/dev_ioctl.c:421
2 locks held by syz-executor.2/13899:
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] inode_lock include/linux/fs.h:724 [inline]
 #0:  (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000be3b3bc8>] __sock_release+0x86/0x2c0 net/socket.c:601
 #1:  (rcu_preempt_state.exp_mutex){+.+.}, at: [<0000000069eb5d82>] exp_funnel_lock kernel/rcu/tree_exp.h:305 [inline]
 #1:  (rcu_preempt_state.exp_mutex){+.+.}, at: [<0000000069eb5d82>] _synchronize_rcu_expedited+0x377/0x840 kernel/rcu/tree_exp.h:596
1 lock held by syz-executor.2/13901:
 #0:  (rtnl_mutex){+.+.}, at: [<00000000cfd2ed4b>] rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0:  (rtnl_mutex){+.+.}, at: [<00000000cfd2ed4b>] rtnetlink_rcv_msg+0x330/0xb40 net/core/rtnetlink.c:4280
1 lock held by syz-executor.2/13906:
 #0:  (rtnl_mutex){+.+.}, at: [<00000000cfd2ed4b>] rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0:  (rtnl_mutex){+.+.}, at: [<00000000cfd2ed4b>] rtnetlink_rcv_msg+0x330/0xb40 net/core/rtnetlink.c:4280
1 lock held by syz-executor.3/13902:
 #0:  (&pipe->mutex/1){+.+.}, at: [<00000000c6a89d3d>] __pipe_lock fs/pipe.c:88 [inline]
 #0:  (&pipe->mutex/1){+.+.}, at: [<00000000c6a89d3d>] pipe_release+0x49/0x240 fs/pipe.c:583
1 lock held by syz-executor.3/13904:
 #0:  (rtnl_mutex){+.+.}, at: [<0000000064ff9b02>] dev_ioctl+0x531/0xdf0 net/core/dev_ioctl.c:421
2 locks held by syz-executor.3/13907:
 #0:  (&pipe->mutex/1){+.+.}, at: [<000000005cc20673>] pipe_lock_nested fs/pipe.c:67 [inline]
 #0:  (&pipe->mutex/1){+.+.}, at: [<000000005cc20673>] pipe_lock+0x58/0x70 fs/pipe.c:75
 #1:  (rtnl_mutex){+.+.}, at: [<00000000cfd2ed4b>] rtnl_lock net/core/rtnetlink.c:72 [inline]
 #1:  (rtnl_mutex){+.+.}, at: [<00000000cfd2ed4b>] rtnetlink_rcv_msg+0x330/0xb40 net/core/rtnetlink.c:4280

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

NMI backtrace for cpu 1
CPU: 1 PID: 23 Comm: khungtaskd Not tainted 4.14.154+ #0
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xe5/0x154 lib/dump_stack.c:58
 nmi_cpu_backtrace.cold+0x47/0x86 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x119/0x147 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline]
 watchdog+0x629/0xbe0 kernel/hung_task.c:274
 kthread+0x31f/0x430 kernel/kthread.c:232
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:404
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 1637 Comm: rs:main Q:Reg Not tainted 4.14.154+ #0
task: 0000000013af29a2 task.stack: 00000000f73ed960
RIP: 0010:memcmp+0x20/0xb0 lib/string.c:860
RSP: 0018:ffff8881d42df780 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff8881d42df82f RCX: 0000000000000007
RDX: 00000000000000ff RSI: ffff8881d1a8da67 RDI: ffff8881d42df820
RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000002
R10: fffffbfff648612d R11: ffffffffb243096b R12: ffff8881d42df898
R13: 000000000000000f R14: ffff8881d42df820 R15: ffff8881d1a8da40
FS:  00007f6202d24700(0000) GS:ffff8881dba00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f714c1d5fe0 CR3: 00000001d5a4a006 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 find_stack lib/stackdepot.c:176 [inline]
 depot_save_stack+0x11d/0x418 lib/stackdepot.c:225
 save_stack mm/kasan/common.c:79 [inline]
 set_track mm/kasan/common.c:85 [inline]
 __kasan_slab_free+0x1b0/0x210 mm/kasan/common.c:463
 slab_free_hook mm/slub.c:1407 [inline]
 slab_free_freelist_hook mm/slub.c:1458 [inline]
 slab_free mm/slub.c:3039 [inline]
 kmem_cache_free+0xd7/0x3b0 mm/slub.c:3055
 mempool_free+0xd3/0x340 mm/mempool.c:439
 bio_free+0x111/0x190 block/bio.c:265
 bio_put+0xa3/0xd0 block/bio.c:558
 blkdev_issue_flush+0x274/0x320 block/blk-flush.c:541
 ext4_sync_file+0xb2f/0x1250 fs/ext4/fsync.c:157
 vfs_fsync_range+0x106/0x260 fs/sync.c:196
 generic_write_sync include/linux/fs.h:2713 [inline]
 ext4_file_write_iter+0x883/0xdb0 fs/ext4/file.c:279
 call_write_iter include/linux/fs.h:1798 [inline]
 new_sync_write fs/read_write.c:471 [inline]
 __vfs_write+0x401/0x5a0 fs/read_write.c:484
 vfs_write+0x17f/0x4d0 fs/read_write.c:546
 SYSC_write fs/read_write.c:594 [inline]
 SyS_write+0x102/0x250 fs/read_write.c:586
 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x7f620478219d
RSP: 002b:00007f6202d23000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00000000000003ba RCX: 00007f620478219d
RDX: 00000000000003ba RSI: 0000000001a3fce0 RDI: 0000000000000006
RBP: 0000000001a3fce0 R08: 0000000001a4008a R09: 00007f62040ff697
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007f6202d23480 R14: 000000000000000c R15: 0000000001a3fae0
Code: 04 24 eb d7 0f 1f 80 00 00 00 00 48 85 d2 74 78 41 54 4c 8d 24 17 55 48 bd 00 00 00 00 00 fc ff df 53 48 89 fb 48 83 ec 10 eb 0d <48> 83 c3 01 48 83 c6 01 49 39 dc 74 45 48 89 d8 48 89 da 48 c1 

Crashes (6):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/11/19 16:54 android-4.14 460dc7c31cef 5bc70212 .config console log report ci-android-414-kasan-gce-root
2019/08/29 15:51 android-4.14 987732fcbbe3 fd37b39e .config console log report ci-android-414-kasan-gce-root
2019/03/12 20:18 android-4.14 b11964adfe4c a71bfb62 .config console log report ci-android-414-kasan-gce-root
2019/03/03 23:41 android-4.14 934272e9380b 1c0e457a .config console log report ci-android-414-kasan-gce-root
2018/12/10 09:18 android-4.14 13b8d9fdf844 96cc4c50 .config console log report ci-android-414-kasan-gce-root
2018/09/22 15:16 android-4.14 666c420fa3ea 37079712 .config console log report ci-android-414-kasan-gce-root
* Struck through repros no longer work on HEAD.