INFO: task syz-executor7:12406 blocked for more than 120 seconds. Not tainted 4.15.0-rc6-next-20180105+ #89 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor7 D26384 12406 3696 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:3224 do_read_fault mm/memory.c:3634 [inline] do_fault mm/memory.c:3734 [inline] handle_pte_fault mm/memory.c:3965 [inline] __handle_mm_fault+0x1c96/0x3210 mm/memory.c:4089 handle_mm_fault+0x305/0x840 mm/memory.c:4126 faultin_page mm/gup.c:502 [inline] __get_user_pages+0x37e/0x1140 mm/gup.c:699 populate_vma_page_range+0x18e/0x230 mm/gup.c:1200 __mm_populate+0x204/0x350 mm/gup.c:1250 mm_populate include/linux/mm.h:2233 [inline] vm_mmap_pgoff+0x1e1/0x1f0 mm/util.c:338 SYSC_mmap_pgoff mm/mmap.c:1544 [inline] SyS_mmap_pgoff+0x423/0x580 mm/mmap.c:1502 SYSC_mmap arch/x86/kernel/sys_x86_64.c:100 [inline] SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:91 entry_SYSCALL_64_fastpath+0x23/0x9a RIP: 0033:0x452ac9 RSP: 002b:00007f101a2cbc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452ac9 RDX: 0000000000000003 RSI: 0000000000001000 RDI: 0000000020e5b000 RBP: 00000000000003a3 R08: 0000000000000016 R09: 0000000000000000 R10: 0000000000002011 R11: 0000000000000212 R12: 00000000006f37e8 R13: 00000000ffffffff R14: 00007f101a2cc6d4 R15: 0000000000000000 Showing all locks held in the system: 2 locks held by khungtaskd/740: #0: (rcu_read_lock){....}, at: [<000000004b45b7b1>] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: (rcu_read_lock){....}, at: [<000000004b45b7b1>] watchdog+0x122/0xab0 kernel/hung_task.c:249 #1: (tasklist_lock){.+.+}, at: [<00000000b3ab77a5>] debug_show_all_locks+0x70/0x280 kernel/locking/lockdep.c:4464 1 lock held by rsyslogd/3316: #0: (&f->f_pos_lock){+.+.}, at: [<000000005a706309>] __fdget_pos+0xa2/0xc0 fs/file.c:765 2 locks held by getty/3437: #0: (&tty->ldisc_sem){++++}, at: [<00000000b24b9f7a>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000ffc47033>] n_tty_read+0x1ec/0x1660 drivers/tty/n_tty.c:2131 2 locks held by getty/3438: #0: (&tty->ldisc_sem){++++}, at: [<00000000b24b9f7a>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000ffc47033>] n_tty_read+0x1ec/0x1660 drivers/tty/n_tty.c:2131 2 locks held by getty/3439: #0: (&tty->ldisc_sem){++++}, at: [<00000000b24b9f7a>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000ffc47033>] n_tty_read+0x1ec/0x1660 drivers/tty/n_tty.c:2131 2 locks held by getty/3440: #0: (&tty->ldisc_sem){++++}, at: [<00000000b24b9f7a>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000ffc47033>] n_tty_read+0x1ec/0x1660 drivers/tty/n_tty.c:2131 2 locks held by getty/3441: #0: (&tty->ldisc_sem){++++}, at: [<00000000b24b9f7a>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000ffc47033>] n_tty_read+0x1ec/0x1660 drivers/tty/n_tty.c:2131 2 locks held by getty/3442: #0: (&tty->ldisc_sem){++++}, at: [<00000000b24b9f7a>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000ffc47033>] n_tty_read+0x1ec/0x1660 drivers/tty/n_tty.c:2131 2 locks held by getty/3443: #0: (&tty->ldisc_sem){++++}, at: [<00000000b24b9f7a>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000ffc47033>] n_tty_read+0x1ec/0x1660 drivers/tty/n_tty.c:2131 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 740 Comm: khungtaskd Not tainted 4.15.0-rc6-next-20180105+ #89 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-20180105+ #89 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:reschedule_interrupt+0x0/0xb0 arch/x86/entry/entry_64.S:943 RSP: 0018:ffffffff85e07cd8 EFLAGS: 00000086 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: ffffffff86638fe0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8801db400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8c8b3a2000 CR3: 0000000005e22001 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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: 25 54 ed 01 00 75 12 65 48 89 3c 25 f8 7f 00 00 65 48 8b 24 25 58 ed 01 00 57 e8 8b 21 20 fc e8 97 1f 00 00 e9 cb e8 ff ff 66 90 <0f> 1f 00 68 02 ff ff ff fc f6 44 24 10 03 74 0b 0f 01 f8 0f 1f