INFO: task syz-executor.5:23944 can't die for more than 143 seconds. syz-executor.5 R running task 29112 23944 9256 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/1045: #0: 00000000871297b8 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5262 3 locks held by rs:main Q:Reg/9105: #0: 00000000cf2a46d0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 #1: 00000000871297b8 (rcu_read_lock){....}, at: trace_sched_stat_runtime include/trace/events/sched.h:435 [inline] #1: 00000000871297b8 (rcu_read_lock){....}, at: update_curr+0x2ea/0x8d0 kernel/sched/fair.c:842 #2: 0000000031cdb7ab (&sb->s_type->i_mutex_key#10){+.+.}, at: inode_trylock include/linux/fs.h:798 [inline] #2: 0000000031cdb7ab (&sb->s_type->i_mutex_key#10){+.+.}, at: ext4_file_write_iter+0x287/0x1430 fs/ext4/file.c:236 1 lock held by rsyslogd/9107: #0: 0000000058fd745b (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 2 locks held by getty/9197: #0: 00000000165858bc (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000005f0a0521 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9198: #0: 00000000522fa974 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000002fac55ad (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9199: #0: 0000000000622cdc (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000870b85ea (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9200: #0: 00000000835fc099 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000054b196af (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9201: #0: 00000000ea9ea717 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000000bc135b9 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9202: #0: 00000000ab406eb6 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000007867cf62 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9203: #0: 000000001f45ba6b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000049776cbd (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.5/23944: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1045 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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 23944 Comm: syz-executor.5 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:kimage_alloc_page+0xf0/0x9f0 kernel/kexec_core.c:705 Code: 7d d0 4c 39 ff 0f 84 95 04 00 00 e8 8a e2 08 00 49 8d 7e 08 48 89 f8 48 c1 e8 03 42 80 3c 28 00 0f 85 bf 07 00 00 4d 8b 66 08 <4c> 3b 65 a8 4d 8d 74 24 f8 75 ac 49 bf 00 00 00 00 00 fc ff df 48 RSP: 0018:ffff888053e97d90 EFLAGS: 00000246 RAX: 1ffffd40002c28f9 RBX: 0000160000000000 RCX: ffffc9001085e000 RDX: 0000000000040000 RSI: ffffffff81690a76 RDI: ffffea00016147c8 RBP: ffff888053e97e08 R08: ffff88808653a640 R09: ffff88808653aec8 R10: fffffbfff13431df R11: ffffffff89a18eff R12: ffffea0001614788 R13: dffffc0000000000 R14: ffffea00016147c0 R15: 000000000528a000 FS: 00007f361e484700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000002272000 CR3: 000000008f5f5000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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:00007f361e483c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000f6 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000459519 RDX: 0000000020000180 RSI: 0000000000000001 RDI: 00000000000000ff RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f361e4846d4 R13: 00000000004c5474 R14: 00000000004d9818 R15: 00000000ffffffff