INFO: task syz-executor.5:7007 can't die for more than 143 seconds. syz-executor.5 R running task 29272 7007 10938 0x00004006 Call Trace: Showing all locks held in the system: 1 lock held by khungtaskd/1054: #0: 00000000218d76b4 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e /kernel/locking/lockdep.c:5257 1 lock held by rsyslogd/9004: #0: 000000005fa2b401 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 /fs/file.c:801 2 locks held by getty/9094: #0: 000000001d6f2723 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 0000000097c04e11 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/9095: #0: 00000000bab7ca4e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 000000008283a0e5 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/9096: #0: 000000003df38e14 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 00000000974ce242 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/9097: #0: 0000000031812a08 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 00000000e2d654df (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/9098: #0: 00000000b5a0527e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 0000000003fc8d33 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/9099: #0: 0000000067197dd7 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 000000009859a8d5 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/9100: #0: 000000009bac8966 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 000000002bfddfa4 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 1 lock held by syz-executor.5/7007: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1054 Comm: khungtaskd Not tainted 5.2.0-next-20190718 #41 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+0x172/0x1f0 /lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x70/0xb2 /lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x23b/0x28b /lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 /arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace /./include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks /kernel/hung_task.c:249 [inline] watchdog+0xc54/0x1320 /kernel/hung_task.c:333 kthread+0x361/0x430 /kernel/kthread.c:255 ret_from_fork+0x24/0x30 /arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 7007 Comm: syz-executor.5 Not tainted 5.2.0-next-20190718 #41 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__sanitizer_cov_trace_pc+0x4c/0x50 /kernel/kcov.c:112 Code: f8 12 00 00 83 fa 02 75 20 48 8b 88 00 13 00 00 8b 80 fc 12 00 00 48 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 5d 0f 1f 00 65 4c 8b 04 25 c0 fd 01 00 65 8b 05 38 78 8f 7e a9 00 RSP: 0018:ffff88804f647d88 EFLAGS: 00000246 RAX: 0000000000040000 RBX: 0000160000000000 RCX: ffffc90010bf0000 RDX: 0000000000040000 RSI: ffffffff8169952c RDI: ffffea000053d708 RBP: ffff88804f647e08 R08: ffff88809ad3a700 R09: ffff88809ad3af90 R10: fffffbfff134a3ff R11: ffffffff89a51fff R12: ffffea000053d6c8 R13: dffffc0000000000 R14: ffffea000053d6c0 R15: 0000000010e62000 FS: 00007f2fcb69e700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000000656b2000 CR4: 00000000001406e0 Call Trace: kimage_load_normal_segment /kernel/kexec_core.c:800 [inline] kimage_load_segment+0x25d/0x740 /kernel/kexec_core.c:917 do_kexec_load+0x41a/0x600 /kernel/kexec.c:155 __do_sys_kexec_load /kernel/kexec.c:249 [inline] __se_sys_kexec_load /kernel/kexec.c:224 [inline] __x64_sys_kexec_load+0x1d5/0x260 /kernel/kexec.c:224 do_syscall_64+0xfd/0x6a0 /arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459819 Code: fd b7 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f2fcb69dc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000f6 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000459819 RDX: 0000000020000000 RSI: 0000000000000010 RDI: 0000000000000000 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2fcb69e6d4 R13: 00000000004c57dd R14: 00000000004d9cb8 R15: 00000000ffffffff