INFO: task syz-executor.2:2165 can't die for more than 143 seconds. syz-executor.2 R running task 28792 2165 8794 0x00004006 Call Trace: Showing all locks held in the system: 1 lock held by khungtaskd/1054: #0: 000000008117196b (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e /kernel/locking/lockdep.c:5257 1 lock held by rsyslogd/8658: #0: 00000000b7c481ca (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 /fs/file.c:801 2 locks held by getty/8748: #0: 000000005a5ce9dc (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 00000000665c8e46 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/8749: #0: 00000000d4d87f15 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 0000000088df335b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/8750: #0: 000000003dcfc607 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 0000000001b87765 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/8751: #0: 00000000946e7fbc (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 00000000445c4984 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/8752: #0: 00000000f92b19ea (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 00000000943bd047 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/8753: #0: 00000000d7d3fddb (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 000000001eb6e0c8 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/8754: #0: 000000001a3578cd (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 000000000a3029b3 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 1 lock held by syz-executor.2/2165: ============================================= 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: 2165 Comm: syz-executor.2 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+0x1a/0x50 /kernel/kcov.c:98 Code: 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 84 78 8f 7e 81 e2 00 01 1f 00 <48> 8b 75 08 75 2b 8b 90 f8 12 00 00 83 fa 02 75 20 48 8b 88 00 13 RSP: 0018:ffff8880a076fd80 EFLAGS: 00000246 RAX: ffff88805d18a540 RBX: 00000000419ff008 RCX: ffffffff81699758 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000007 RBP: ffff8880a076fd80 R08: ffff88805d18a540 R09: fffff940001a6379 R10: fffff940001a6378 R11: ffffea0000d31bc7 R12: ffff8880419a52d0 R13: 0000000000000000 R14: 000000000ffda000 R15: dffffc0000000000 FS: 00007f96efd50700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c42722cf08 CR3: 0000000064f05000 CR4: 00000000001406e0 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+0x3b5/0x9f0 /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: 0033:0x459819 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:00007f96efd4fc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000f6 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000459819 RDX: 0000000020001300 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f96efd506d4 R13: 00000000004c57dd R14: 00000000004d9cb8 R15: 00000000ffffffff