INFO: task syz-executor.0:21392 can't die for more than 143 seconds. syz-executor.0 R running task 28936 21392 4197 0x00004006 Call Trace: Showing all locks held in the system: 1 lock held by khungtaskd/1045: #0: 000000007eb4309a (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5262 1 lock held by rsyslogd/8814: #0: 00000000143d0887 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 2 locks held by getty/8903: #0: 00000000cf2d4305 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000acf79783 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8904: #0: 0000000064922d69 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000ce596832 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8905: #0: 00000000edc1bfa3 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000d361f8ba (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8906: #0: 0000000030abc634 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000007ce555e6 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8907: #0: 0000000094fe0f58 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000e973623c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8908: #0: 00000000e727f57c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000003b55d3a6 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8909: #0: 00000000c52d8080 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000857991c8 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.0/21392: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1045 Comm: khungtaskd Not tainted 5.2.0-rc3-next-20190607 #11 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+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1be/0x236 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+0xb88/0x12b0 kernel/hung_task.c:333 kthread+0x354/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 21392 Comm: syz-executor.0 Not tainted 5.2.0-rc3-next-20190607 #11 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:kimage_dst_used kernel/kexec_core.c:668 [inline] RIP: 0010:kimage_alloc_page+0x37d/0x9f0 kernel/kexec_core.c:744 Code: 83 e5 01 4c 89 ee e8 32 db 08 00 4d 85 ed 0f 85 4c ff ff ff e8 84 d9 08 00 49 89 dd 31 ff 41 83 e5 08 4c 89 ee e8 13 db 08 00 <4d> 85 ed 0f 84 3c ff ff ff e8 65 d9 08 00 4c 8b 6d c0 4c 89 f6 4c RSP: 0018:ffff888181297d90 EFLAGS: 00000297 RAX: 0000000000000002 RBX: 00000001431f8008 RCX: ffffffff8168044d RDX: 0000000000000008 RSI: 0000000000000000 RDI: 0000000000000007 RBP: ffff888181297e08 R08: ffff888051aa4400 R09: ffffed1015d06be0 R10: ffffed1015d06bdf R11: ffff8880ae835efb R12: ffff888143141fb8 R13: 0000000000000008 R14: 000000003d80a000 R15: dffffc0000000000 FS: 00007fa896ea1700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c4238a11c0 CR3: 000000005c6ce000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: kimage_load_normal_segment kernel/kexec_core.c:802 [inline] kimage_load_segment+0x25d/0x740 kernel/kexec_core.c:919 do_kexec_load+0x41a/0x600 kernel/kexec.c:157 __do_sys_kexec_load kernel/kexec.c:251 [inline] __se_sys_kexec_load kernel/kexec.c:226 [inline] __x64_sys_kexec_load+0x1d5/0x260 kernel/kexec.c:226 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459279 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:00007fa896ea0c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000f6 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000459279 RDX: 0000000020000180 RSI: 0000000000000001 RDI: 00000000ffffffff RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa896ea16d4 R13: 00000000004c51b9 R14: 00000000004d9258 R15: 00000000ffffffff