audit: type=1326 audit(2000000821.112:2756335): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=18198 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x457679 code=0x50000 audit: type=1326 audit(2000000821.112:2756336): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=18198 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x457679 code=0x50000 audit: type=1326 audit(2000000821.112:2756337): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=18198 comm="syz-executor4" exe="/root/syz-executor4" sig=0 arch=c000003e syscall=202 compat=0 ip=0x457679 code=0x50000 INFO: task kworker/0:3:4834 blocked for more than 140 seconds. Not tainted 4.14.71+ #8 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/0:3 D27424 4834 2 0x80000000 Workqueue: ipv6_addrconf addrconf_verify_work Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893 addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4432 process_one_work+0x86e/0x15c0 kernel/workqueue.c:2114 worker_thread+0xdc/0x1000 kernel/workqueue.c:2248 kthread+0x348/0x420 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402 Showing all locks held in the system: 1 lock held by khungtaskd/23: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x74/0x20f kernel/locking/lockdep.c:4541 1 lock held by rsyslogd/1631: #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0xa2/0xc0 fs/file.c:768 2 locks held by getty/1759: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x20/0x80 drivers/tty/tty_ldisc.c:275 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1ff/0x15e0 drivers/tty/n_tty.c:2142 3 locks held by kworker/0:3/4834: #0: ("%s"("ipv6_addrconf")){+.+.}, at: [] process_one_work+0x787/0x15c0 kernel/workqueue.c:2085 #1: ((addr_chk_work).work){+.+.}, at: [] process_one_work+0x7bf/0x15c0 kernel/workqueue.c:2089 #2: (rtnl_mutex){+.+.}, at: [] addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4432 1 lock held by init/21112: #0: (tty_mutex){+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:1922 [inline] #0: (tty_mutex){+.+.}, at: [] tty_open+0x3a8/0x980 drivers/tty/tty_io.c:2006 1 lock held by init/21113: #0: (tty_mutex){+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:1922 [inline] #0: (tty_mutex){+.+.}, at: [] tty_open+0x3a8/0x980 drivers/tty/tty_io.c:2006 1 lock held by init/21114: #0: (tty_mutex){+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:1922 [inline] #0: (tty_mutex){+.+.}, at: [] tty_open+0x3a8/0x980 drivers/tty/tty_io.c:2006 1 lock held by init/21115: #0: (tty_mutex){+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:1922 [inline] #0: (tty_mutex){+.+.}, at: [] tty_open+0x3a8/0x980 drivers/tty/tty_io.c:2006 1 lock held by init/21116: #0: (tty_mutex){+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:1922 [inline] #0: (tty_mutex){+.+.}, at: [] tty_open+0x3a8/0x980 drivers/tty/tty_io.c:2006 1 lock held by init/21117: #0: (tty_mutex){+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:1922 [inline] #0: (tty_mutex){+.+.}, at: [] tty_open+0x3a8/0x980 drivers/tty/tty_io.c:2006 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 23 Comm: khungtaskd Not tainted 4.14.71+ #8 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x11b lib/dump_stack.c:53 nmi_cpu_backtrace.cold.0+0x47/0x85 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x121/0x146 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:196 [inline] watchdog+0x574/0xa70 kernel/hung_task.c:252 kthread+0x348/0x420 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 18198 Comm: syz-executor4 Not tainted 4.14.71+ #8 task: ffff8801c9bc2f00 task.stack: ffff8801d3f28000 RIP: 0010:set_track mm/kasan/kasan.c:459 [inline] RIP: 0010:kasan_slab_free+0x10a/0x190 mm/kasan/kasan.c:524 RSP: 0018:ffff8801d3f2f9a0 EFLAGS: 00000282 RAX: 00000000e6c0011b RBX: ffff8801d9cc5000 RCX: 0000000000000000 RDX: ffff8801d3f2fa00 RSI: ffff8801d9cc5000 RDI: 0000000000000000 RBP: ffff8801d3f2fbd0 R08: 0000000015edc09f R09: 0000000000000000 R10: ffff8801c9bc3730 R11: 0000000000000001 R12: ffff8801c6d1a708 R13: ffff8801c6d1a720 R14: 0000000000000246 R15: 0000000000457679 FS: 00007f7d90b4f700(0000) GS:ffff8801dba00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc6493e4a30 CR3: 00000001d2e20006 CR4: 00000000001606b0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: slab_free_hook mm/slub.c:1389 [inline] slab_free_freelist_hook mm/slub.c:1410 [inline] slab_free mm/slub.c:2966 [inline] kmem_cache_free+0x12d/0x350 mm/slub.c:2988 audit_buffer_free kernel/audit.c:1614 [inline] audit_log_end+0x134/0x270 kernel/audit.c:2315 __audit_seccomp+0x14e/0x1a0 kernel/auditsc.c:2458 audit_seccomp include/linux/audit.h:318 [inline] seccomp_log kernel/seccomp.c:607 [inline] __seccomp_filter+0x331/0xce0 kernel/seccomp.c:770 __secure_computing+0x9c/0x310 kernel/seccomp.c:798 syscall_trace_enter+0x506/0xc10 arch/x86/entry/common.c:120 do_syscall_64+0x331/0x4b0 arch/x86/entry/common.c:280 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x457679 RSP: 002b:00007f7d90b4ecf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000000 RBX: 000000000072bf08 RCX: 0000000000457679 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000072bf08 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000072bf0c R13: 00007ffdee1cfb3f R14: 00007f7d90b4f9c0 R15: 0000000000000000 Code: c0 89 85 d0 fd ff ff 74 0a 8d 50 ff 48 83 3c d6 ff 74 78 48 8d bd d0 fd ff ff be 00 00 00 01 e8 7d f0 68 00 48 89 de 41 89 45 0c <48> 63 bb 84 01 00 00 4c 01 e7 e8 e7 0f 00 00 b8 01 00 00 00 48