INFO: task syz-executor.1:18265 can't die for more than 143 seconds. syz-executor.1 R running task 23344 18265 18045 0x00004006 Call Trace: Showing all locks held in the system: 1 lock held by khungtaskd/1047: #0: 0000000005f60eb2 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5262 1 lock held by rsyslogd/8359: #0: 000000001772943f (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 2 locks held by getty/8449: #0: 00000000c2987519 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000001ac3b254 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8450: #0: 000000000894ec13 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000061e22249 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8451: #0: 0000000026394d54 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000cfaa7730 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8452: #0: 00000000963f7d00 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000068b0e08c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8453: #0: 00000000557f1d94 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000b1c7a973 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8454: #0: 0000000094386e70 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000c0933bc0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8455: #0: 000000004bb45e70 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000668df387 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1047 Comm: khungtaskd Not tainted 5.2.0-rc4-next-20190611 #12 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: 18265 Comm: syz-executor.1 Not tainted 5.2.0-rc4-next-20190611 #12 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:rcu_read_unlock_sched_notrace include/linux/rcupdate.h:731 [inline] RIP: 0010:trace_local_timer_exit arch/x86/include/asm/trace/irq_vectors.h:56 [inline] RIP: 0010:smp_apic_timer_interrupt+0x34c/0x550 arch/x86/kernel/apic/apic.c:1067 Code: 0f 85 f2 01 00 00 48 8b 05 b9 40 5d 02 e8 0c 8e 1d fa 85 c0 74 0d 80 3d 98 f7 5c 02 00 0f 84 82 00 00 00 65 ff 0d dc ba c1 78 <0f> 85 e4 fd ff ff e8 8a 23 c0 f9 e9 da fd ff ff 65 ff 05 c5 ba c1 RSP: 0018:ffff8880ae809fc0 EFLAGS: 00000082 RAX: 0000000000000001 RBX: ffff8880ae820100 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 00000000ffffffff RDI: 0000000000000086 RBP: ffff8880ae809fe8 R08: ffff888026cd6640 R09: ffffed1015d06be0 R10: ffffed1015d06bdf R11: ffff8880ae835efb R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f2f8351b700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000007bb820 CR3: 000000009106a000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:806 RIP: 0010:__read_once_size include/linux/compiler.h:194 [inline] RIP: 0010:is_huge_zero_page include/linux/huge_mm.h:230 [inline] RIP: 0010:release_pages+0x102/0x1930 mm/swap.c:740 Code: 03 4c 89 a5 60 ff ff ff 41 89 cc 4c 01 f8 48 89 85 50 ff ff ff e8 1e 11 e1 ff 48 8b 85 50 ff ff ff 80 38 00 0f 85 63 13 00 00 <48> 8b 05 4f 42 11 08 49 39 c6 0f 84 cf 03 00 00 e8 f9 10 e1 ff 49 RSP: 0018:ffff88801a077118 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: fffffbfff134261f RBX: 000000000000000f RCX: ffffc900131d9000 RDX: 0000000000040000 RSI: ffffffff818fee92 RDI: 0000000000000004 RBP: ffff88801a0771f8 R08: ffff888026cd6640 R09: fffff94000c1df3f R10: fffff94000c1df3e R11: ffffea00060ef9f7 R12: 0000000000000008 R13: 0000000000000002 R14: ffffea00060efa00 R15: dffffc0000000000 pagevec_lru_move_fn+0x215/0x2a0 mm/swap.c:214 __pagevec_lru_add mm/swap.c:926 [inline] __lru_cache_add+0x1cb/0x2d0 mm/swap.c:405 lru_cache_add+0x21c/0x590 mm/swap.c:441 add_to_page_cache_lru+0x349/0x760 mm/filemap.c:932 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+0x4c6/0x5c0 mm/readahead.c:212 ra_submit mm/internal.h:62 [inline] do_sync_mmap_readahead mm/filemap.c:2416 [inline] filemap_fault+0x141a/0x2850 mm/filemap.c:2502 __do_fault+0x111/0x4d0 mm/memory.c:3122 do_shared_fault mm/memory.c:3587 [inline] do_fault mm/memory.c:3665 [inline] handle_pte_fault mm/memory.c:3892 [inline] __handle_mm_fault+0x2a8e/0x3eb0 mm/memory.c:4016 handle_mm_fault+0x3b7/0xa90 mm/memory.c:4053 do_user_addr_fault arch/x86/mm/fault.c:1455 [inline] __do_page_fault+0x5ef/0xda0 arch/x86/mm/fault.c:1521 do_page_fault+0x71/0x57d arch/x86/mm/fault.c:1552 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1156 RIP: 0010:__put_user_4+0x1c/0x30 arch/x86/lib/putuser.S:70 Code: 1f 00 c3 90 66 2e 0f 1f 84 00 00 00 00 00 65 48 8b 1c 25 c0 fd 01 00 48 8b 9b 18 14 00 00 48 83 eb 03 48 39 d9 73 3c 0f 1f 00 <89> 01 31 c0 0f 1f 00 c3 66 90 66 2e 0f 1f 84 00 00 00 00 00 65 48 RSP: 0018:ffff88801a077cb8 EFLAGS: 00010297 RAX: 0000000000000000 RBX: 00007fffffffeffd RCX: 00000000200062b8 RDX: 000000000000d998 RSI: ffffffff819a53c3 RDI: 0000000000000286 RBP: ffff88801a077ee0 R08: ffff888026cd6640 R09: 0000000000000001 R10: ffff888026cd6ed0 R11: ffff888026cd6640 R12: 000000000000000b R13: 0000000000040000 R14: 0000000020006280 R15: 0000000000000058 __do_sys_sendmmsg net/socket.c:2418 [inline] __se_sys_sendmmsg net/socket.c:2415 [inline] __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2415 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:00007f2f8351ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000459279 RDX: 0800000000000059 RSI: 0000000020005fc0 RDI: 0000000000000005 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2f8351b6d4 R13: 00000000004c683e R14: 00000000004db7c0 R15: 00000000ffffffff