INFO: task syz-executor.2:9211 can't die for more than 143 seconds. syz-executor.2 R running task 29704 9211 8745 0x00004006 Call Trace: Showing all locks held in the system: 1 lock held by khungtaskd/1034: #0: 00000000b5e389de (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5262 1 lock held by rsyslogd/8609: #0: 000000005ed5accf (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 2 locks held by getty/8699: #0: 000000007e438600 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000006abe6e4 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8700: #0: 000000005e9db1c5 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000091a2b101 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8701: #0: 000000000740ca6a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000005db1336d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8702: #0: 000000008febe3b5 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000379c7a4a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8703: #0: 00000000e22877a5 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000005351bbc4 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8704: #0: 000000002d33221d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000001c371122 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8705: #0: 000000002f51e35c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000086db4ddc (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.2/9211: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1034 Comm: khungtaskd Not tainted 5.2.0-rc6-next-20190625 #22 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:353 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 9211 Comm: syz-executor.2 Not tainted 5.2.0-rc6-next-20190625 #22 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x4/0x50 kernel/kcov.c:101 Code: 15 09 41 bc f4 ff ff ff e8 fd b2 e9 ff 48 c7 05 4e 25 15 09 00 00 00 00 e9 77 e9 ff ff 90 90 90 90 90 90 90 90 90 55 48 89 e5 <65> 48 8b 04 25 c0 fd 01 00 65 8b 15 b4 b0 8f 7e 81 e2 00 01 1f 00 RSP: 0018:ffff8880533efd80 EFLAGS: 00000202 RAX: 1ffffd400026b189 RBX: 0000160000000000 RCX: ffffc9000a22b000 RDX: 0000000000040000 RSI: ffffffff81696276 RDI: ffffea0001358c48 RBP: ffff8880533efd80 R08: ffff88808d97a040 R09: ffff88808d97a8c8 R10: fffffbfff134355f R11: ffffffff89a1aaff R12: ffffea0001358c08 R13: dffffc0000000000 R14: ffffea0001358c00 R15: 00000000058fa000 FS: 00007f559043f700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 000000009e1b8000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: page_to_boot_pfn include/linux/kexec.h:325 [inline] kimage_alloc_page+0xac/0x9f0 kernel/kexec_core.c:706 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:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459519 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:00007f559043ec78 EFLAGS: 00000246 ORIG_RAX: 00000000000000f6 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000459519 RDX: 0000000020000180 RSI: 0000000000000001 RDI: 0000000000000007 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f559043f6d4 R13: 00000000004c5474 R14: 00000000004d9818 R15: 00000000ffffffff