INFO: task syz-executor.3:22181 can't die for more than 143 seconds. syz-executor.3 R running task 28424 22181 9283 0x00004006 Call Trace: Showing all locks held in the system: 1 lock held by khungtaskd/1047: #0: 0000000035f375d9 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5257 1 lock held by rsyslogd/9149: #0: 00000000a773277f (&ei->i_mmap_sem){++++}, at: ext4_filemap_fault+0x7b/0xaf fs/ext4/inode.c:6308 2 locks held by getty/9238: #0: 000000005c477227 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000004751c18e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9239: #0: 00000000c3efd872 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000008171621f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9240: #0: 00000000f10e3fde (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000002b58e26f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9241: #0: 00000000ada2bac7 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000006f2fb8b4 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9242: #0: 00000000d7f8d78e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000f96e218b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9243: #0: 00000000b554ed25 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000038551f42 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9244: #0: 0000000011bd502b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000006904ab3c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.3/22181: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1047 Comm: khungtaskd Not tainted 5.2.0-rc6-next-20190628 #25 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: 22181 Comm: syz-executor.3 Not tainted 5.2.0-rc6-next-20190628 #25 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:check_kcov_mode kernel/kcov.c:68 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x14/0x50 kernel/kcov.c:102 Code: ce a4 16 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 34 a0 8f 7e <81> e2 00 01 1f 00 48 8b 75 08 75 2b 8b 90 f8 12 00 00 83 fa 02 75 RSP: 0018:ffff888052317d80 EFLAGS: 00000206 RAX: ffff8880a78f4000 RBX: 0000000043c69008 RCX: ffffc9000c43c000 RDX: 0000000080000000 RSI: ffffffff81697034 RDI: 0000000000000006 RBP: ffff888052317d80 R08: ffff8880a78f4000 R09: fffff940009db991 R10: fffff940009db990 R11: ffffea0004edcc87 R12: ffff888058774fc0 R13: 000000013b732000 R14: 0000000089771000 R15: dffffc0000000000 FS: 00007f0924b59700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000000106b4000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kimage_dst_used kernel/kexec_core.c:663 [inline] kimage_alloc_page+0x2c7/0x9f0 kernel/kexec_core.c:742 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: 0033:0x459519 Code: Bad RIP value. RSP: 002b:00007f0924b58c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000f6 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000459519 RDX: 00000000200005c0 RSI: 0000000000000010 RDI: 0000000000001200 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0924b596d4 R13: 00000000004c5474 R14: 00000000004d9818 R15: 00000000ffffffff