__find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 INFO: task syz-executor0:4478 blocked for more than 140 seconds. device loop0 blocksize: 4096 Not tainted 4.18.0-rc5-next-20180720+ #12 __find_get_block_slow() failed. block=1, b_blocknr=8 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D18832 4478 1 0x00000004 b_state=0x00000029, b_size=512 Call Trace: device loop0 blocksize: 4096 context_switch kernel/sched/core.c:2821 [inline] __schedule+0x87c/0x1ea0 kernel/sched/core.c:3469 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 schedule+0xfb/0x450 kernel/sched/core.c:3513 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 wb_wait_for_completion+0x201/0x2e0 fs/fs-writeback.c:221 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 __writeback_inodes_sb_nr+0x405/0x580 fs/fs-writeback.c:2333 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 writeback_inodes_sb_nr fs/fs-writeback.c:2350 [inline] writeback_inodes_sb+0x27/0x30 fs/fs-writeback.c:2365 __find_get_block_slow() failed. block=1, b_blocknr=8 __sync_filesystem fs/sync.c:36 [inline] sync_filesystem+0x16f/0x330 fs/sync.c:64 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 generic_shutdown_super+0xdd/0x530 fs/super.c:441 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 kill_block_super+0xa4/0x100 fs/super.c:1371 __find_get_block_slow() failed. block=1, b_blocknr=8 deactivate_locked_super+0x97/0x100 fs/super.c:328 b_state=0x00000029, b_size=512 deactivate_super+0x2bb/0x320 fs/super.c:359 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 cleanup_mnt+0xbf/0x160 fs/namespace.c:1041 device loop0 blocksize: 4096 __cleanup_mnt+0x16/0x20 fs/namespace.c:1048 task_work_run+0x1ec/0x2a0 kernel/task_work.c:113 __find_get_block_slow() failed. block=1, b_blocknr=8 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 entry_SYSCALL_64_after_hwframe+0x49/0xbe b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 RIP: 0033:0x4584c7 Code: __find_get_block_slow() failed. block=1, b_blocknr=8 Bad RIP value. RSP: 002b:00007ffff7b08588 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00000000004584c7 RDX: 0000000000402738 RSI: 0000000000000002 RDI: 00007ffff7b08620 __find_get_block_slow() failed. block=1, b_blocknr=8 RBP: 00007ffff7b0a330 R08: 0000000000000000 R09: 000000000000000a R10: 0000000000000005 R11: 0000000000000206 R12: 00000000012b9940 b_state=0x00000029, b_size=512 R13: 0000000000000000 R14: 00007ffff7b09d00 R15: 0000000000702140 INFO: lockdep is turned off. device loop0 blocksize: 4096 NMI backtrace for cpu 0 __find_get_block_slow() failed. block=1, b_blocknr=8 CPU: 0 PID: 901 Comm: khungtaskd Not tainted 4.18.0-rc5-next-20180720+ #12 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 b_state=0x00000029, b_size=512 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 device loop0 blocksize: 4096 nmi_cpu_backtrace.cold.3+0x48/0x88 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x151/0x192 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:144 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:204 [inline] watchdog+0xb39/0x10b0 kernel/hung_task.c:265 kthread+0x345/0x410 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: __find_get_block_slow() failed. block=1, b_blocknr=8 INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.841 msecs NMI backtrace for cpu 1 CPU: 1 PID: 7 Comm: kworker/u4:0 Not tainted 4.18.0-rc5-next-20180720+ #12 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: writeback wb_workfn (flush-7:0) RIP: 0010:note_interrupt+0x49d/0xa01 kernel/irq/spurious.c:402 Code: 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 38 05 00 00 8b 85 24 ff ff ff 29 83 98 00 00 00 9e 6c 18 00 48 8d bb 88 00 00 00 48 b8 00 00 00 00 00 fc ff df RSP: 0018:ffff8801daf07910 EFLAGS: 00000097 RAX: 0000000080010102 RBX: ffff8801ce252900 RCX: ffffffff81643740 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000005 RBP: ffff8801daf07a10 R08: ffff8801d9ab61c0 R09: 0000000000000000 R10: ffffed0039c4a535 R11: ffff8801ce2529ab R12: 1ffff1003b5e0f29 R13: 0000000000000001 R14: ffff8801ce25297c R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5710093088 CR3: 00000001d96c6000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: handle_irq_event_percpu+0x18a/0x1d0 kernel/irq/handle.c:194 handle_irq_event+0xa7/0x135 kernel/irq/handle.c:206 handle_edge_irq+0x20f/0x870 kernel/irq/chip.c:791 generic_handle_irq_desc include/linux/irqdesc.h:154 [inline] handle_irq+0x18c/0x2e7 arch/x86/kernel/irq_64.c:77 do_IRQ+0x78/0x190 arch/x86/kernel/irq.c:245 common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:645 RIP: 0010:arch_local_irq_enable arch/x86/include/asm/paravirt.h:793 [inline] RIP: 0010:__do_softirq+0x2a0/0xb17 kernel/softirq.c:276 Code: c7 c0 b8 b2 f1 88 48 c1 e8 03 42 80 3c 38 00 0f 85 50 07 00 00 48 83 3d 25 b0 31 01 00 0f 84 ab 06 00 00 fb 66 0f 1f 44 00 00 <48> c7 85 68 fe ff ff 00 91 e0 88 b8 ff ff ff ff 0f bc 85 74 fe ff RSP: 0018:ffff8801daf07c98 EFLAGS: 00000286 ORIG_RAX: ffffffffffffffd8 RAX: 1ffffffff11e3657 RBX: ffff8801d9ab61c0 RCX: ffffffff816b1fb4 RDX: 0000000000000004 RSI: 0000000080000002 RDI: ffffffff892a9580 RBP: ffff8801daf07e70 R08: ffff8801d9ab61c0 R09: 0000000000000000 R10: ffffed0043fff009 R11: 0000000000000000 R12: 1ffff1003b5e0fe0 R13: ffff8801daf07fc0 R14: 0000000000000000 R15: dffffc0000000000 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x1d4/0x210 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:527 [inline] smp_apic_timer_interrupt+0x186/0x730 arch/x86/kernel/apic/apic.c:1052 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:867 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:783 [inline] RIP: 0010:console_trylock_spinning kernel/printk/printk.c:1683 [inline] RIP: 0010:vprintk_emit+0x7f9/0x910 kernel/printk/printk.c:1923 Code: 00 00 00 00 fc ff df 41 80 3c 04 00 0f 85 d3 00 00 00 48 83 3d 4f 64 8e 07 00 74 2d e8 60 58 19 00 48 8b bd 90 fe ff ff 57 9d <0f> 1f 44 00 00 e9 68 fe ff ff e8 48 58 19 00 0f 0b e8 41 58 19 00 RSP: 0018:ffff8801d9ace100 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff8801d9ab61c0 RBX: 1ffff1003b359c26 RCX: ffffffff81634c8e RDX: 0000000000000000 RSI: ffffffff81634e60 RDI: 0000000000000293 RBP: ffff8801d9ace278 R08: ffff8801d9ab61c0 R09: 0000000000000001 R10: fffffbfff11f1224 R11: ffffffff88f89123 R12: 1ffffffff11e3655 R13: 0000000000000200 R14: ffff8801d9ace250 R15: 0000000000000000 vprintk_default+0x28/0x30 kernel/printk/printk.c:1965 vprintk_func+0x7a/0x117 kernel/printk/printk_safe.c:398 printk+0xa7/0xcf kernel/printk/printk.c:1998 __find_get_block_slow fs/buffer.c:232 [inline] __find_get_block.cold.61+0x3a/0xff fs/buffer.c:1295 __getblk_slow fs/buffer.c:1040 [inline] __getblk_gfp+0x2be/0xb10 fs/buffer.c:1321 __bread_gfp+0x2d/0x310 fs/buffer.c:1355 sb_bread include/linux/buffer_head.h:307 [inline] __fat_write_inode+0x347/0xb60 fs/fat/inode.c:864 fat_write_inode+0x97/0x180 fs/fat/inode.c:913 write_inode fs/fs-writeback.c:1176 [inline] __writeback_single_inode+0xf6a/0x1620 fs/fs-writeback.c:1375 writeback_sb_inodes+0x71f/0x1220 fs/fs-writeback.c:1580 wb_writeback+0x470/0xf80 fs/fs-writeback.c:1756 wb_do_writeback fs/fs-writeback.c:1901 [inline] wb_workfn+0x477/0x1760 fs/fs-writeback.c:1942 ? debug_object_de Lost 45 message(s)!