INFO: task syz-executor3:31783 blocked for more than 120 seconds. Not tainted 4.15.0-rc6-next-20180102+ #86 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor3 D26784 31783 3709 0x00000004 Call Trace: context_switch kernel/sched/core.c:2800 [inline] __schedule+0x850/0x1e10 kernel/sched/core.c:3376 schedule+0x7c/0x1a0 kernel/sched/core.c:3435 io_schedule+0x1c/0x70 kernel/sched/core.c:5043 wait_on_page_bit_common mm/filemap.c:1099 [inline] wait_on_page_bit mm/filemap.c:1132 [inline] wait_on_page_locked include/linux/pagemap.h:530 [inline] __lock_page_or_retry+0x725/0x900 mm/filemap.c:1310 lock_page_or_retry include/linux/pagemap.h:510 [inline] filemap_fault+0xadf/0x1900 mm/filemap.c:2532 __do_fault+0x8a/0x1d0 mm/memory.c:3206 do_shared_fault mm/memory.c:3671 [inline] do_fault mm/memory.c:3720 [inline] handle_pte_fault mm/memory.c:3947 [inline] __handle_mm_fault+0x1b1f/0x3210 mm/memory.c:4071 handle_mm_fault+0x305/0x840 mm/memory.c:4108 faultin_page mm/gup.c:502 [inline] __get_user_pages+0x37e/0x1140 mm/gup.c:699 __get_user_pages_locked mm/gup.c:870 [inline] get_user_pages_unlocked+0x251/0x380 mm/gup.c:990 get_user_pages_fast+0x186/0x2b0 mm/gup.c:1819 iov_iter_get_pages+0x239/0xde0 lib/iov_iter.c:1068 bio_iov_iter_get_pages+0x114/0x4b0 block/bio.c:890 __blkdev_direct_IO_simple+0x37e/0xa00 fs/block_dev.c:220 blkdev_direct_IO+0xbee/0xf40 fs/block_dev.c:428 generic_file_read_iter+0x304/0x20d0 mm/filemap.c:2343 blkdev_read_iter+0x105/0x170 fs/block_dev.c:1912 call_read_iter include/linux/fs.h:1769 [inline] new_sync_read fs/read_write.c:401 [inline] __vfs_read+0x54d/0x730 fs/read_write.c:413 vfs_read+0x11e/0x350 fs/read_write.c:447 SYSC_read fs/read_write.c:573 [inline] SyS_read+0xd4/0x1a0 fs/read_write.c:566 entry_SYSCALL_64_fastpath+0x23/0x9a RIP: 0033:0x452ac9 RSP: 002b:00007f9d71bb7c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 000000000071bf58 RCX: 0000000000452ac9 RDX: 0000000000000200 RSI: 0000000020e5b000 RDI: 0000000000000014 RBP: 00000000000005c0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f6aa0 R13: 00000000ffffffff R14: 00007f9d71bb86d4 R15: 0000000000000002 Showing all locks held in the system: 2 locks held by khungtaskd/738: #0: (rcu_read_lock){....}, at: [<0000000010b3c854>] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: (rcu_read_lock){....}, at: [<0000000010b3c854>] watchdog+0x122/0xab0 kernel/hung_task.c:249 #1: (tasklist_lock){.+.+}, at: [<00000000d4a3ad25>] debug_show_all_locks+0x70/0x280 kernel/locking/lockdep.c:4464 1 lock held by rsyslogd/3317: #0: (&f->f_pos_lock){+.+.}, at: [<00000000b5e51d0d>] __fdget_pos+0xa2/0xc0 fs/file.c:765 2 locks held by getty/3440: #0: (&tty->ldisc_sem){++++}, at: [<00000000d589e1ce>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000010bf4c12>] n_tty_read+0x1ec/0x1660 drivers/tty/n_tty.c:2131 2 locks held by getty/3441: #0: (&tty->ldisc_sem){++++}, at: [<00000000d589e1ce>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000010bf4c12>] n_tty_read+0x1ec/0x1660 drivers/tty/n_tty.c:2131 2 locks held by getty/3442: #0: (&tty->ldisc_sem){++++}, at: [<00000000d589e1ce>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000010bf4c12>] n_tty_read+0x1ec/0x1660 drivers/tty/n_tty.c:2131 2 locks held by getty/3443: #0: (&tty->ldisc_sem){++++}, at: [<00000000d589e1ce>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000010bf4c12>] n_tty_read+0x1ec/0x1660 drivers/tty/n_tty.c:2131 2 locks held by getty/3444: #0: (&tty->ldisc_sem){++++}, at: [<00000000d589e1ce>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000010bf4c12>] n_tty_read+0x1ec/0x1660 drivers/tty/n_tty.c:2131 2 locks held by getty/3445: #0: (&tty->ldisc_sem){++++}, at: [<00000000d589e1ce>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000010bf4c12>] n_tty_read+0x1ec/0x1660 drivers/tty/n_tty.c:2131 2 locks held by getty/3446: #0: (&tty->ldisc_sem){++++}, at: [<00000000d589e1ce>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000010bf4c12>] n_tty_read+0x1ec/0x1660 drivers/tty/n_tty.c:2131 1 lock held by blkid/30318: #0: (&bdev->bd_mutex){+.+.}, at: [<00000000b5a01631>] __blkdev_put+0xbc/0x7c0 fs/block_dev.c:1756 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 738 Comm: khungtaskd Not tainted 4.15.0-rc6-next-20180102+ #86 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x137/0x198 lib/dump_stack.c:53 nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103 nmi_trigger_cpumask_backtrace+0x122/0x180 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:138 [inline] check_hung_task kernel/hung_task.c:132 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline] watchdog+0x73d/0xab0 kernel/hung_task.c:249 kthread+0x33c/0x400 kernel/kthread.c:238 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:524 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.15.0-rc6-next-20180102+ #86 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:mark_lock+0xf8/0x1070 kernel/locking/lockdep.c:3116 RSP: 0018:ffff8801db407c30 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: 0000000000000100 RCX: 1ffffffff0bc597b RDX: 1ffffffff0e014da RSI: ffffffff85e2cbb8 RDI: ffffffff8700a6d0 RBP: ffff8801db407c70 R08: ffffffff81542fbe R09: 000000000000000e R10: 1ffff1003b680fa6 R11: 0000000000000000 R12: ffffffff8700a6a0 R13: 0000000000000008 R14: ffffffff85e2cbd8 R15: ffffffff85e2cbb8 FS: 0000000000000000(0000) GS:ffff8801db400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001b38000 CR3: 0000000005e22001 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __lock_acquire+0x63e/0x3cf0 kernel/locking/lockdep.c:3387 lock_acquire+0x16b/0x420 kernel/locking/lockdep.c:3914 seqcount_lockdep_reader_access include/linux/seqlock.h:81 [inline] read_seqcount_begin include/linux/seqlock.h:164 [inline] ktime_get+0xc5/0x2b0 kernel/time/timekeeping.c:762 tick_nohz_irq_enter kernel/time/tick-sched.c:1130 [inline] tick_irq_enter+0x9e/0x390 kernel/time/tick-sched.c:1151 irq_enter+0xb6/0xd0 kernel/softirq.c:346 scheduler_ipi+0x1f0/0x450 kernel/sched/core.c:1794 smp_reschedule_interrupt+0x67/0x470 arch/x86/kernel/smp.c:277 reschedule_interrupt+0xa9/0xb0 arch/x86/entry/entry_64.S:944 RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54 RSP: 0018:ffffffff85e07d00 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff02 RAX: dffffc0000000000 RBX: ffffffff85e2c340 RCX: 0000000000000000 RDX: 1ffffffff0bd90a0 RSI: 0000000000000001 RDI: ffffffff85ec8500 RBP: ffffffff85e07d00 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffffffff86637220 R15: 0000000000000000 arch_safe_halt arch/x86/include/asm/paravirt.h:93 [inline] default_idle+0x52/0x310 arch/x86/kernel/process.c:354 arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:345 default_idle_call+0x36/0x90 kernel/sched/idle.c:98 cpuidle_idle_call kernel/sched/idle.c:156 [inline] do_idle+0x24a/0x3b0 kernel/sched/idle.c:246 cpu_startup_entry+0xbe/0xd0 kernel/sched/idle.c:351 rest_init+0xed/0xf0 init/main.c:436 start_kernel+0x77e/0x7a4 init/main.c:716 x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:378 x86_64_start_kernel+0x77/0x7a arch/x86/kernel/head64.c:359 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:237 Code: 8b 05 ad ac 09 06 85 c0 0f 84 81 00 00 00 45 31 e4 49 8d 7c 24 30 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 29 0f 00 00 49 85 5c 24 30 74 71 41 bc 01 00 00 00 48 83