device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 INFO: task syz-executor0:4510 blocked for more than 140 seconds. b_state=0x0000002b, b_size=512 Not tainted 4.19.0-rc1-next-20180829+ #50 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. device loop0 blocksize: 4096 syz-executor0 D16904 4510 1 0x00000004 Call Trace: __find_get_block_slow() failed. block=1, b_blocknr=8 context_switch kernel/sched/core.c:2825 [inline] __schedule+0x87c/0x1df0 kernel/sched/core.c:3473 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 schedule+0xfb/0x450 kernel/sched/core.c:3517 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 wb_wait_for_completion+0x201/0x2e0 fs/fs-writeback.c:221 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 __writeback_inodes_sb_nr+0x405/0x580 fs/fs-writeback.c:2340 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 writeback_inodes_sb_nr fs/fs-writeback.c:2357 [inline] writeback_inodes_sb+0x27/0x30 fs/fs-writeback.c:2372 __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=0x0000002b, 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=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 kill_block_super+0xa4/0x100 fs/super.c:1374 deactivate_locked_super+0x97/0x100 fs/super.c:328 device loop0 blocksize: 4096 deactivate_super+0x2bb/0x320 fs/super.c:359 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 cleanup_mnt+0xbf/0x160 fs/namespace.c:1050 __cleanup_mnt+0x16/0x20 fs/namespace.c:1057 b_state=0x0000002b, b_size=512 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 device loop0 blocksize: 4096 kworker/u4:0(7): getblk(): executed=9 bh_count=0 bh_state=0 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 __find_get_block_slow() failed. block=1, b_blocknr=8 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 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459a97 __find_get_block_slow() failed. block=1, b_blocknr=8 Code: Bad RIP value. b_state=0x0000002b, b_size=512 RSP: 002b:00007ffc071e6fc8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000459a97 device loop0 blocksize: 4096 RDX: 0000000000408440 RSI: 0000000000000002 RDI: 00007ffc071e7070 RBP: 0000000000000472 R08: 0000000000000000 R09: 000000000000000b __find_get_block_slow() failed. block=1, b_blocknr=8 R10: 0000000000000005 R11: 0000000000000206 R12: 00007ffc071e80d0 R13: 000000000219f940 R14: 0000000000000000 R15: badc0ffeebadface Showing all locks held in the system: b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 4 locks held by kworker/u4:0/7: 1 lock held by khungtaskd/774: __find_get_block_slow() failed. block=1, b_blocknr=8 #0: 00000000b2438680 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x428 kernel/locking/lockdep.c:4436 1 lock held by rsyslogd/4375: #0: 0000000033dedb86 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766 __find_get_block_slow() failed. block=1, b_blocknr=8 2 locks held by getty/4465: #0: b_state=0x0000002b, b_size=512 00000000acef62fa (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 0000000043cccbcc ( device loop0 blocksize: 4096 &ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 __find_get_block_slow() failed. block=1, b_blocknr=8 2 locks held by getty/4466: #0: b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 0000000023e5137a (&tty->ldisc_sem){++++} __find_get_block_slow() failed. block=1, b_blocknr=8 , at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 0000000068af2150 (&ldata->atomic_read_lock __find_get_block_slow() failed. block=1, b_blocknr=8 ){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4467: b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 #0: 0000000007158335 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: __find_get_block_slow() failed. block=1, b_blocknr=8 000000004eccde27 (&ldata->atomic_read_lock b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 ){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4468: __find_get_block_slow() failed. block=1, b_blocknr=8 #0: 00000000a3f5ec6e ( b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 &tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: __find_get_block_slow() failed. block=1, b_blocknr=8 00000000152a85aa (&ldata->atomic_read_lock b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 ){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4469: __find_get_block_slow() failed. block=1, b_blocknr=8 #0: 000000001c3a8085 ( b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 &tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: __find_get_block_slow() failed. block=1, b_blocknr=8 00000000fe145a51 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4470: #0: b_state=0x0000002b, b_size=512 00000000d9d26989 ( device loop0 blocksize: 4096 &tty->ldisc_sem){++++} __find_get_block_slow() failed. block=1, b_blocknr=8 , at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 00000000c4cd195a ( __find_get_block_slow() failed. block=1, b_blocknr=8 &ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 2 locks held by getty/4471: #0: __find_get_block_slow() failed. block=1, b_blocknr=8 0000000080d8114d (&tty->ldisc_sem b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 ){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: __find_get_block_slow() failed. block=1, b_blocknr=8 00000000920aa0ba (&ldata->atomic_read_lock b_state=0x0000002b, b_size=512 ){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 1 lock held by syz-executor0/4510: device loop0 blocksize: 4096 #0: 00000000debc5efc ( __find_get_block_slow() failed. block=1, b_blocknr=8 &fc->fs_type->s_umount_key#45){+.+.} b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 , at: deactivate_super+0x2b3/0x320 fs/super.c:358 __find_get_block_slow() failed. block=1, b_blocknr=8 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 774 Comm: khungtaskd Not tainted 4.19.0-rc1-next-20180829+ #50 b_state=0x0000002b, b_size=512 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 device loop0 blocksize: 4096 nmi_cpu_backtrace.cold.3+0x48/0x88 lib/nmi_backtrace.c:101 __find_get_block_slow() failed. block=1, b_blocknr=8 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+0xb39/0x1040 kernel/hung_task.c:265 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 kthread+0x35a/0x420 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 1 to CPUs 0: device loop0 blocksize: 4096 NMI backtrace for cpu 0 INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.839 msecs CPU: 0 PID: 7 Comm: kworker/u4:0 Not tainted 4.19.0-rc1-next-20180829+ #50 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: writeback wb_workfn (flush-7:0) RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:788 [inline] RIP: 0010:lock_is_held_type+0x18b/0x210 kernel/locking/lockdep.c:3941 Code: ff df 41 c7 84 24 3c 08 00 00 00 00 00 00 48 89 fa 48 c1 ea 03 80 3c 02 00 75 63 48 83 3d d4 03 93 06 00 74 30 48 89 df 57 9d <0f> 1f 44 00 00 48 83 c4 08 44 89 e8 5b 41 5c 41 5d 5d c3 48 83 c4 RSP: 0018:ffff8801db007c50 EFLAGS: 00000286 RAX: dffffc0000000000 RBX: 0000000000000286 RCX: 0000000000000000 RDX: 1ffffffff0fe37cd RSI: 0000000000000000 RDI: 0000000000000286 RBP: ffff8801db007c70 R08: ffffed003b6046df R09: ffffed003b6046de R10: ffffed003b6046de R11: ffff8801db0236f3 R12: ffff8801d9eca1c0 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb3f8b46140 CR3: 00000001afa4f000 CR4: 00000000001406f0 Call Trace: lock_is_held include/linux/lockdep.h:344 [inline] rcu_read_lock_sched_held+0x108/0x120 kernel/rcu/update.c:117 trace_softirq_entry include/trace/events/irq.h:128 [inline] __do_softirq+0x844/0xa74 kernel/softirq.c:291 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x1d6/0x210 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x18e/0x6a0 arch/x86/kernel/apic/apic.c:1056 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:867 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:788 [inline] RIP: 0010:console_trylock_spinning kernel/printk/printk.c:1686 [inline] RIP: 0010:vprintk_emit+0x7f9/0x910 kernel/printk/printk.c:1926 Code: 00 00 00 00 fc ff df 41 80 3c 04 00 0f 85 d3 00 00 00 48 83 3d 1f 3a 8e 06 00 74 2d e8 80 46 19 00 48 8b bd 90 fe ff ff 57 9d <0f> 1f 44 00 00 e9 68 fe ff ff e8 68 46 19 00 0f 0b e8 61 46 19 00 RSP: 0018:ffff8801d9ed60c0 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff8801d9eca1c0 RBX: 1ffff1003b3dac1e RCX: 1ffff1003b3d954e RDX: 0000000000000000 RSI: ffffffff81638450 RDI: 0000000000000293 RBP: ffff8801d9ed6238 R08: ffff8801d9ecaa00 R09: 0000000000000006 R10: ffff8801d9eca1c0 R11: 0000000000000000 R12: 1ffffffff0fe37cd R13: 0000000000000200 R14: ffff8801d9ed6210 R15: 0000000000000000 vprintk_default+0x28/0x30 kernel/printk/printk.c:1968 vprintk_func+0x7a/0x117 kernel/printk/printk_safe.c:398 printk+0xa7/0xcf kernel/printk/printk.c:2001 __find_get_block_slow fs/buffer.c:238 [inline] __find_get_block.cold.61+0xd8/0xff fs/buffer.c:1326 __getblk_slow fs/buffer.c:1059 [inline] __getblk_gfp+0x3dc/0xe00 fs/buffer.c:1352 __bread_gfp+0x2d/0x310 fs/buffer.c:1386 sb_bread include/linux/buffer_head.h:307 [inline] __fat_write_inode+0x347/0xb60 fs/fat/inode.c:860 fat_write_inode+0x97/0x180 fs/fat/inode.c:909 write_inode fs/fs-writeback.c:1183 [inline] __writeback_single_inode+0xd8e/0x1330 fs/fs-writeback.c:1382 writeback_sb_inodes+0x71f/0x1150 fs/fs-writeback.c:1587 wb_writeback+0x466/0xe80 fs/fs-writeback.c:1763 wb_do_writeback fs/fs-writeback.c:1908 [inline] wb_workfn+0x463/0x1610 fs/fs-writeback.c:1949 process_one_work+0xc73/0x1aa0 kernel/workqueue.c:2153 worker_thread+0x189/0x13c0 kernel/workqueue.c:2296 kthread+0x35a/0x420 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415