__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-executor0:4490 blocked for more than 140 seconds. device loop0 blocksize: 4096 Not tainted 4.18.0-rc4-next-20180713+ #7 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D __find_get_block_slow() failed. block=1, b_blocknr=8 21352 4490 1 0x00000004 b_state=0x00000029, b_size=512 Call Trace: device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 context_switch kernel/sched/core.c:2848 [inline] __schedule+0x87c/0x1ed0 kernel/sched/core.c:3496 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 schedule+0xfb/0x450 kernel/sched/core.c:3540 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 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 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 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 __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 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 writeback_inodes_sb_nr fs/fs-writeback.c:2350 [inline] writeback_inodes_sb+0x27/0x30 fs/fs-writeback.c:2365 __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 generic_shutdown_super+0xdd/0x530 fs/super.c:441 __find_get_block_slow() failed. block=1, b_blocknr=8 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 deactivate_super+0x2bb/0x320 fs/super.c:359 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 cleanup_mnt+0xbf/0x160 fs/namespace.c:1044 __find_get_block_slow() failed. block=1, b_blocknr=8 __cleanup_mnt+0x16/0x20 fs/namespace.c:1051 task_work_run+0x1ec/0x2a0 kernel/task_work.c:113 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __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 RIP: 0033:0x4584c7 b_state=0x00000029, b_size=512 Code: Bad RIP value. device loop0 blocksize: 4096 RSP: 002b:00007ffd88db9208 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6 __find_get_block_slow() failed. block=1, b_blocknr=8 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00000000004584c7 RDX: 0000000000402738 RSI: 0000000000000002 RDI: 00007ffd88db92a0 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 RBP: 00007ffd88dbafb0 R08: 0000000000000000 R09: 000000000000000b R10: 0000000000000005 R11: 0000000000000202 R12: 00000000027e4940 __find_get_block_slow() failed. block=1, b_blocknr=8 R13: 0000000000000000 R14: 00007ffd88dba980 R15: 0000000000702140 INFO: lockdep is turned off. b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 NMI backtrace for cpu 0 CPU: 0 PID: 901 Comm: khungtaskd Not tainted 4.18.0-rc4-next-20180713+ #7 __find_get_block_slow() failed. block=1, b_blocknr=8 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+0x1c9/0x2b4 lib/dump_stack.c:113 b_state=0x00000029, b_size=512 nmi_cpu_backtrace.cold.3+0x48/0x88 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x151/0x192 lib/nmi_backtrace.c:62 device loop0 blocksize: 4096 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:231 [inline] watchdog+0xb81/0x10f0 kernel/hung_task.c:292 __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 kthread+0x345/0x410 kernel/kthread.c:246 b_state=0x00000029, b_size=512 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: device loop0 blocksize: 4096 INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.776 msecs NMI backtrace for cpu 1 CPU: 1 PID: 22 Comm: kworker/u4:1 Not tainted 4.18.0-rc4-next-20180713+ #7 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: writeback wb_workfn (flush-7:0) RIP: 0010:find_next_bit+0x104/0x130 lib/find_bit.c:74 Code: 24 24 31 ff 4c 89 e6 e8 9a b1 1a fe 4d 85 e4 74 b6 e8 60 b0 1a fe f3 49 0f bc f4 48 01 de 4c 39 ee 4c 0f 46 ee e8 4c b0 1a fe <4c> 89 e8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 4c 89 e7 e8 16 37 59 fe RSP: 0018:ffff8801daf078f8 EFLAGS: 00000006 RAX: ffff8801d94125c0 RBX: 00000000000000c0 RCX: ffffffff8361bf77 RDX: 0000000000000100 RSI: ffffffff8361c004 RDI: 0000000000000007 RBP: ffff8801daf07920 R08: ffff8801d94125c0 R09: ffffed003b5e4938 R10: ffffed003b5e4938 R11: ffff8801daf249c3 R12: 0000000000000010 R13: 00000000000000c4 R14: ffff8801daf24a18 R15: ffff8801daf24a30 FS: 0000000000000000(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000001b13a8000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: next_pending_bucket kernel/time/timer.c:1410 [inline] __next_timer_interrupt+0x14c/0x1a0 kernel/time/timer.c:1426 collect_expired_timers kernel/time/timer.c:1599 [inline] __run_timers+0x24b/0xc70 kernel/time/timer.c:1662 run_timer_softirq+0x60/0x70 kernel/time/timer.c:1694 __do_softirq+0x2e8/0xb17 kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x1d1/0x200 kernel/softirq.c:408 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 cf 98 8e 07 00 74 2d e8 b0 56 19 00 48 8b bd 90 fe ff ff 57 9d <0f> 1f 44 00 00 e9 68 fe ff ff e8 98 56 19 00 0f 0b e8 91 56 19 00 RSP: 0018:ffff8801d941e100 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff8801d94125c0 RBX: 1ffff1003b283c26 RCX: ffffffff816317ce RDX: 0000000000000000 RSI: ffffffff816319a0 RDI: 0000000000000293 RBP: ffff8801d941e278 R08: ffff8801d94125c0 R09: 0000000000000001 R10: fffffbfff11f1224 R11: ffffffff88f89123 R12: 1ffffffff11e364d R13: 0000000000000200 R14: ffff8801d941e250 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:238 [inline] __find_get_block.cold.61+0xd8/0xff 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:856 fat_write_inode+0x97/0x180 fs/fat/inode.c:905 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 process_one_work+0xc73/0x1ba0 kernel/workqueue.c:2153 worker_thread+0x189/0x13c0 kernel/workqueue.c:2296 ? trace_hardirqs_o Lost 7 message(s)!