audit: type=1804 audit(1613156988.050:172): pid=27697 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.1" name="/root/syzkaller-testdir732320850/syzkaller.lOCxRF/448/bus" dev="sda1" ino=17083 res=1 Bluetooth: hci1 command 0x0406 tx timeout INFO: task syz-executor.5:27682 blocked for more than 140 seconds. Not tainted 4.14.218-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D27416 27682 11092 0x00000004 Call Trace: context_switch syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3384 schedule+0x8d/0x1b0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3428 schedule_timeout+0x80a/0xe90 syzkaller/managers/linux-4-14/kernel/kernel/time/timer.c:1724 do_wait_for_common syzkaller/managers/linux-4-14/kernel/kernel/sched/completion.c:91 [inline] __wait_for_common syzkaller/managers/linux-4-14/kernel/kernel/sched/completion.c:112 [inline] wait_for_common+0x272/0x430 syzkaller/managers/linux-4-14/kernel/kernel/sched/completion.c:123 flush_work+0x3fe/0x770 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2893 __cancel_work_timer+0x321/0x460 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2964 p9_conn_destroy syzkaller/managers/linux-4-14/kernel/net/9p/trans_fd.c:898 [inline] p9_fd_close+0x28d/0x420 syzkaller/managers/linux-4-14/kernel/net/9p/trans_fd.c:925 p9_client_create+0x736/0x12c0 syzkaller/managers/linux-4-14/kernel/net/9p/client.c:1095 v9fs_session_init+0x1c5/0x1540 syzkaller/managers/linux-4-14/kernel/fs/9p/v9fs.c:422 v9fs_mount+0x73/0x860 syzkaller/managers/linux-4-14/kernel/fs/9p/vfs_super.c:135 mount_fs+0x92/0x2a0 syzkaller/managers/linux-4-14/kernel/fs/super.c:1237 vfs_kern_mount.part.0+0x5b/0x470 syzkaller/managers/linux-4-14/kernel/fs/namespace.c:1046 vfs_kern_mount syzkaller/managers/linux-4-14/kernel/fs/namespace.c:1036 [inline] do_new_mount syzkaller/managers/linux-4-14/kernel/fs/namespace.c:2549 [inline] do_mount+0xe53/0x2a00 syzkaller/managers/linux-4-14/kernel/fs/namespace.c:2879 SYSC_mount syzkaller/managers/linux-4-14/kernel/fs/namespace.c:3095 [inline] SyS_mount+0xa8/0x120 syzkaller/managers/linux-4-14/kernel/fs/namespace.c:3072 do_syscall_64+0x1d5/0x640 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x465d99 RSP: 002b:00007fe08ce0a188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000465d99 RDX: 0000000020000080 RSI: 0000000020000300 RDI: 0000000000000000 RBP: 00000000004bcf27 R08: 0000000020000740 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008 R13: 00007ffc5738f1bf R14: 00007fe08ce0a300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1532: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a syzkaller/managers/linux-4-14/kernel/kernel/locking/lockdep.c:4548 1 lock held by in:imklog/7682: #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 syzkaller/managers/linux-4-14/kernel/fs/file.c:769 2 locks held by kworker/0:3/8304: #0: ("events"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2087 #1: ((&m->rq)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2091 2 locks held by agetty/18370: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 syzkaller/managers/linux-4-14/kernel/drivers/tty/tty_ldisc.c:284 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e3/0x1680 syzkaller/managers/linux-4-14/kernel/drivers/tty/n_tty.c:2156 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1532 Comm: khungtaskd Not tainted 4.14.218-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack syzkaller/managers/linux-4-14/kernel/lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 syzkaller/managers/linux-4-14/kernel/lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 syzkaller/managers/linux-4-14/kernel/lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x180 syzkaller/managers/linux-4-14/kernel/lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace syzkaller/managers/linux-4-14/kernel/./include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks syzkaller/managers/linux-4-14/kernel/kernel/hung_task.c:195 [inline] watchdog+0x5b9/0xb40 syzkaller/managers/linux-4-14/kernel/kernel/hung_task.c:274 kthread+0x30d/0x420 syzkaller/managers/linux-4-14/kernel/kernel/kthread.c:232 ret_from_fork+0x24/0x30 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/entry_64.S:404 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff8720d24e