INFO: task syz-executor.1:14057 can't die for more than 143 seconds. syz-executor.1 R running task 23784 14057 9344 0x00004006 Call Trace: Showing all locks held in the system: 1 lock held by khungtaskd/1047: #0: 000000008e32b425 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5257 1 lock held by rsyslogd/9214: #0: 0000000049883d73 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 2 locks held by getty/9304: #0: 00000000c6544ef3 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000006861f540 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9305: #0: 00000000f84f84d7 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000004741ad67 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9306: #0: 00000000bb56069e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000bf4b6739 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9307: #0: 000000005b08ae53 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000008f370e35 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9308: #0: 000000001942faf8 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000087f54709 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9309: #0: 000000003c637fda (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000007d34526a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9310: #0: 000000008d63287f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000de821b09 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 3 locks held by syz-executor.1/14057: ============================================= NMI backtrace for cpu 1 CPU: 1 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 14057 Comm: syz-executor.1 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:hrtimer_update_base kernel/time/hrtimer.c:573 [inline] RIP: 0010:hrtimer_interrupt+0x114/0x770 kernel/time/hrtimer.c:1490 Code: ff ff ff ff ff ff ff 7f 4c 89 f7 49 89 44 24 18 e8 51 7f cf 05 49 8d 96 d8 01 00 00 49 8d 8e 58 02 00 00 49 89 c5 48 89 55 c0 <49> 8d 86 58 01 00 00 48 89 4d c8 49 8d 7e 40 48 89 c6 48 89 c3 48 RSP: 0018:ffff8880ae809f18 EFLAGS: 00000086 RAX: 0000000000000082 RBX: 0000000000000000 RCX: ffff8880ae826f58 RDX: ffff8880ae826ed8 RSI: 0000000000000004 RDI: ffff8880ae809e78 RBP: ffff8880ae809fb0 R08: 1ffff11015d013cf R09: ffffed1015d013d0 R10: ffffed1015d013cf R11: 0000000000000003 R12: ffff8880ae820100 R13: 0000000000000082 R14: ffff8880ae826d00 R15: 0000000000000000 FS: 00007f20f870a700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 0000000091be6000 CR4: 00000000001506f0 Call Trace: local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline] smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1066 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] RIP: 0010:_raw_spin_unlock_irq+0x54/0x90 kernel/locking/spinlock.c:199 Code: c0 40 ea d2 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 33 48 83 3d a5 93 a0 01 00 74 20 fb 66 0f 1f 44 00 00 01 00 00 00 e8 c2 40 1c fa 65 8b 05 d3 a6 cf 78 85 c0 74 06 41 RSP: 0018:ffff88805b0073b0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff11a5d48 RBX: ffff88805b0074d0 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffff888030e0cb94 RBP: ffff88805b0073b8 R08: ffff888030e0c300 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a6acb4a0 R13: 0000000000000000 R14: ffff8880a6acb498 R15: ffff88805b007460 spin_unlock_irq include/linux/spinlock.h:388 [inline] __add_to_page_cache_locked+0x646/0xec0 mm/filemap.c:869 add_to_page_cache_lru+0x1d8/0x790 mm/filemap.c:916 mpage_readpages+0x344/0x630 fs/mpage.c:399 blkdev_readpages+0x2d/0x40 fs/block_dev.c:632 read_pages+0x108/0x540 mm/readahead.c:126 __do_page_cache_readahead+0x4e0/0x5d0 mm/readahead.c:212 ra_submit mm/internal.h:62 [inline] do_sync_mmap_readahead mm/filemap.c:2416 [inline] filemap_fault+0x1389/0x2840 mm/filemap.c:2502 __do_fault+0x111/0x540 mm/memory.c:3193 do_read_fault mm/memory.c:3590 [inline] do_fault mm/memory.c:3720 [inline] handle_pte_fault mm/memory.c:3951 [inline] __handle_mm_fault+0x2cc0/0x3f20 mm/memory.c:4075 handle_mm_fault+0x1b5/0x6b0 mm/memory.c:4112 do_user_addr_fault arch/x86/mm/fault.c:1438 [inline] __do_page_fault+0x531/0xdc0 arch/x86/mm/fault.c:1504 do_page_fault+0x71/0x5e1 arch/x86/mm/fault.c:1535 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1161 RIP: 0010:__get_user_8+0x21/0x2b arch/x86/lib/getuser.S:95 Code: 1f 00 c3 66 0f 1f 44 00 00 48 83 c0 07 72 25 65 48 8b 14 25 c0 fd 01 00 48 3b 82 18 14 00 00 73 13 48 19 d2 48 21 d0 0f 1f 00 <48> 8b 50 f9 31 c0 0f 1f 00 c3 31 d2 48 c7 c0 f2 ff ff ff 0f 1f 00 RSP: 0018:ffff88805b007ee8 EFLAGS: 00010206 RAX: 0000000020000047 RBX: 0000000000000101 RCX: ffffc90007ffe000 RDX: ffffffffffffffff RSI: ffffffff819ca9d3 RDI: 0000000000000282 RBP: ffff88805b007f10 R08: 0000000000000001 R09: ffff888030e0cb90 R10: fffffbfff134681f R11: ffffffff89a340ff R12: ffff88805b007f58 R13: ffffffff88d2ea40 R14: 0000000020000040 R15: 0000000000000000 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:00007f20f8709c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000ce RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000459519 RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000101 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f20f870a6d4 R13: 00000000004c088f R14: 00000000004d3530 R15: 00000000ffffffff