INFO: task syz-executor.0:6763 can't die for more than 143 seconds. syz-executor.0 R running task 28712 6763 9166 0x00004006 Call Trace: kasan_check_read+0x11/0x20 mm/kasan/common.c:94 test_bit include/asm-generic/bitops-instrumented.h:237 [inline] hlock_class kernel/locking/lockdep.c:163 [inline] lookup_chain_cache_add kernel/locking/lockdep.c:2801 [inline] validate_chain kernel/locking/lockdep.c:2857 [inline] __lock_acquire+0x16f0/0x4680 kernel/locking/lockdep.c:3885 Showing all locks held in the system: 1 lock held by khungtaskd/1046: #0: 00000000ca2370e2 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5262 1 lock held by rsyslogd/9034: #0: 00000000814a988a (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 2 locks held by getty/9124: #0: 00000000406a72f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000005bd83400 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9125: #0: 0000000002aa867e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000003f692a79 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9126: #0: 000000009433ab03 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000002f22243b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9127: #0: 000000004936976b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000009a8d7fc5 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9128: #0: 00000000c3df68b8 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000f83ab36e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9129: #0: 000000001ab1bbf7 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000004d506999 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9130: #0: 000000001f0a83c9 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000001d58b73e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.0/6763: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1046 Comm: khungtaskd Not tainted 5.2.0-rc6-next-20190624 #21 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 6763 Comm: syz-executor.0 Not tainted 5.2.0-rc6-next-20190624 #21 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: 8e 66 15 09 00 00 00 00 e9 a4 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 74 10 90 7e <81> e2 00 01 1f 00 48 8b 75 08 75 2b 8b 90 f0 12 00 00 83 fa 02 75 RSP: 0018:ffff888052b3fd80 EFLAGS: 00000206 RAX: ffff88809b12e200 RBX: 0000160000000000 RCX: ffffc90005de9000 RDX: 0000000080000000 RSI: ffffffff81690a76 RDI: ffffea0000fbe3c8 RBP: ffff888052b3fd80 R08: ffff88809b12e200 R09: ffff88809b12ea88 R10: fffffbfff13431df R11: ffffffff89a18eff R12: ffffea0000fbe388 R13: dffffc0000000000 R14: ffffea0000fbe380 R15: 0000000002fce000 FS: 00007f64a8b08700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000000979c5000 CR4: 00000000001506f0 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: Bad RIP value. RSP: 002b:00007f64a8b07c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000f6 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000459519 RDX: 0000000020000180 RSI: 0000000000000001 RDI: ffffffffffffffdf RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f64a8b086d4 R13: 00000000004c5474 R14: 00000000004d9818 R15: 00000000ffffffff