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 INFO: task syz-executor5:11572 blocked for more than 140 seconds. __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 Not tainted 4.19.0-rc7-next-20181012+ #93 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 syz-executor5 D b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 24552 11572 5771 0x00000004 __find_get_block_slow() failed. block=1, b_blocknr=8 Call Trace: b_state=0x00000029, b_size=512 context_switch kernel/sched/core.c:2831 [inline] __schedule+0x8cf/0x21d0 kernel/sched/core.c:3480 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 schedule+0xfe/0x460 kernel/sched/core.c:3524 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 wb_wait_for_completion+0x1f9/0x2d0 fs/fs-writeback.c:221 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 sync_inodes_sb+0x33e/0x480 fs/fs-writeback.c:2417 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 sync_inodes_one_sb+0x59/0x70 fs/sync.c:74 __find_get_block_slow() failed. block=1, b_blocknr=8 iterate_supers+0x149/0x290 fs/super.c:724 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 ksys_sync+0xec/0x1e0 fs/sync.c:113 __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 __ia32_sys_sync+0xe/0x20 fs/sync.c:124 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 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 entry_SYSCALL_64_after_hwframe+0x49/0xbe device loop0 blocksize: 4096 RIP: 0033:0x457569 __find_get_block_slow() failed. block=1, b_blocknr=8 Code: Bad RIP value. b_state=0x00000029, b_size=512 RSP: 002b:00007f7c9716dc78 EFLAGS: 00000246 device loop0 blocksize: 4096 ORIG_RAX: 00000000000000a2 __find_get_block_slow() failed. block=1, b_blocknr=8 RAX: ffffffffffffffda RBX: 000000000072bfa8 RCX: 0000000000457569 b_state=0x00000029, b_size=512 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 device loop0 blocksize: 4096 RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000 __find_get_block_slow() failed. block=1, b_blocknr=8 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7c9716e6d4 b_state=0x00000029, b_size=512 R13: 00000000004c2eae R14: 00000000004d7ad0 R15: 00000000ffffffff device loop0 blocksize: 4096 INFO: task syz-executor5:11576 blocked for more than 140 seconds. __find_get_block_slow() failed. block=1, b_blocknr=8 Not tainted 4.19.0-rc7-next-20181012+ #93 b_state=0x00000029, b_size=512 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. device loop0 blocksize: 4096 syz-executor5 D __find_get_block_slow() failed. block=1, b_blocknr=8 24488 11576 5771 0x00000004 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 Call Trace: __find_get_block_slow() failed. block=1, b_blocknr=8 context_switch kernel/sched/core.c:2831 [inline] __schedule+0x8cf/0x21d0 kernel/sched/core.c:3480 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 schedule+0xfe/0x460 kernel/sched/core.c:3524 __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 wb_wait_for_completion+0x1f9/0x2d0 fs/fs-writeback.c:221 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 sync_inodes_sb+0x33e/0x480 fs/fs-writeback.c:2417 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 sync_inodes_one_sb+0x59/0x70 fs/sync.c:74 device loop0 blocksize: 4096 iterate_supers+0x149/0x290 fs/super.c:724 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 ksys_sync+0xec/0x1e0 fs/sync.c:113 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 __ia32_sys_sync+0xe/0x20 fs/sync.c:124 device loop0 blocksize: 4096 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 __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 entry_SYSCALL_64_after_hwframe+0x49/0xbe __find_get_block_slow() failed. block=1, b_blocknr=8 RIP: 0033:0x457569 b_state=0x00000029, b_size=512 Code: Bad RIP value. device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 RSP: 002b:00007f7c9714cc78 EFLAGS: 00000246 b_state=0x00000029, b_size=512 ORIG_RAX: 00000000000000a2 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 RAX: ffffffffffffffda RBX: 000000000072c048 RCX: 0000000000457569 b_state=0x00000029, b_size=512 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 device loop0 blocksize: 4096 RBP: 000000000072c040 R08: 0000000000000000 R09: 0000000000000000 __find_get_block_slow() failed. block=1, b_blocknr=8 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7c9714d6d4 b_state=0x00000029, b_size=512 R13: 00000000004c2eae R14: 00000000004d7ad0 R15: 00000000ffffffff device loop0 blocksize: 4096 Showing all locks held in the system: __find_get_block_slow() failed. block=1, b_blocknr=8 6 locks held by kworker/u4:0/7: b_state=0x00000029, b_size=512 1 lock held by khungtaskd/981: device loop0 blocksize: 4096 #0: 0000000070cb0ca4 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4375 1 lock held by rsyslogd/5493: #0: 0000000077480375 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766 2 locks held by getty/5583: #0: 00000000297c29b5 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000b7b23b5a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5584: #0: 00000000cdfd82c6 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 0000000090784ef8 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5585: #0: 00000000ebe32a5a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000afe29475 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5586: #0: 000000008fd13890 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 0000000065f24dea (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5587: #0: 00000000556126be (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000cfdc6115 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5588: #0: 000000006ba89ebf (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000a42f4360 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5589: #0: 00000000d7662f7f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000001f5cab7b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 1 lock held by syz-executor5/11572: #0: 000000009b90dd62 (&fc->fs_type->s_umount_key#49){++++}, at: iterate_supers+0xe2/0x290 fs/super.c:722 1 lock held by syz-executor5/11576: #0: 000000009b90dd62 (&fc->fs_type->s_umount_key#49){++++}, at: iterate_supers+0xe2/0x290 fs/super.c:722 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 981 Comm: khungtaskd Not tainted 4.19.0-rc7-next-20181012+ #93 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+0x244/0x3ab lib/dump_stack.c:113 nmi_cpu_backtrace.cold.2+0x5c/0xa1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1e8/0x22a 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+0xb39/0x1050 kernel/hung_task.c:265 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 2.539 msecs NMI backtrace for cpu 1 CPU: 1 PID: 7 Comm: kworker/u4:0 Not tainted 4.19.0-rc7-next-20181012+ #93 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: writeback wb_workfn (flush-7:0) RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:31 [inline] RIP: 0010:atomic_read include/asm-generic/atomic-instrumented.h:22 [inline] RIP: 0010:queued_spin_is_locked include/asm-generic/qspinlock.h:35 [inline] RIP: 0010:debug_spin_unlock kernel/locking/spinlock_debug.c:98 [inline] RIP: 0010:do_raw_spin_unlock+0x113/0x2f0 kernel/locking/spinlock_debug.c:134 Code: 0f b6 04 02 84 c0 74 08 3c 03 0f 8e a2 01 00 00 49 c1 ec 03 45 85 ff 45 89 7e c0 48 b8 00 00 00 00 00 fc ff df 41 c6 04 04 f8 <0f> 84 33 01 00 00 4c 8d 63 10 48 b8 00 00 00 00 00 fc ff df 4c 89 RSP: 0018:ffff8801daf06cd8 EFLAGS: 00000002 RAX: dffffc0000000000 RBX: ffff8801b6dcc3f8 RCX: ffffffff8161bb77 RDX: 1ffff1003b5e0d9f RSI: 0000000000000004 RDI: ffff8801b6dcc3f8 RBP: ffff8801daf06d60 R08: ffffed0036db9880 R09: ffffed0036db987f R10: ffffed0036db987f R11: ffff8801b6dcc3fb R12: 1ffff1003b5e0d9f R13: 1ffff1003b5e0d9b R14: ffff8801daf06d38 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000001bd915000 CR4: 00000000001406e0 Call Trace: __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:159 [inline] _raw_spin_unlock_irqrestore+0x27/0xd0 kernel/locking/spinlock.c:184 spin_unlock_irqrestore include/linux/spinlock.h:384 [inline] test_clear_page_writeback+0x585/0x1990 mm/page-writeback.c:2729 end_page_writeback+0x493/0x950 mm/filemap.c:1223 ext4_finish_bio+0x77e/0xb50 fs/ext4/page-io.c:118 ext4_end_bio+0x18f/0x6e0 fs/ext4/page-io.c:342 bio_endio+0x5ca/0xb60 block/bio.c:1775 req_bio_endio block/blk-core.c:278 [inline] blk_update_request+0x580/0xd20 block/blk-core.c:3075 scsi_end_request+0xde/0x860 drivers/scsi/scsi_lib.c:673 scsi_io_completion+0x2ce/0x1ca0 drivers/scsi/scsi_lib.c:1093 scsi_finish_command+0x579/0x970 drivers/scsi/scsi.c:248 scsi_softirq_done+0x465/0x520 drivers/scsi/scsi_lib.c:1737 blk_done_softirq+0x4c2/0x760 block/blk-softirq.c:37 __do_softirq+0x30d/0xb26 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x17f/0x1c0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] do_IRQ+0x111/0x1c0 arch/x86/kernel/irq.c:258 common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:582 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:761 [inline] RIP: 0010:console_trylock_spinning kernel/printk/printk.c:1683 [inline] RIP: 0010:vprintk_emit+0x824/0x930 kernel/printk/printk.c:1920 Code: 00 00 00 00 fc ff df 41 80 3c 04 00 0f 85 e0 00 00 00 48 83 3d ec 61 cd 07 00 74 34 e8 45 d6 19 00 48 8b bd 90 fe ff ff 57 9d <0f> 1f 44 00 00 e9 68 fe ff ff e8 2d d6 19 00 0f 0b e8 26 d6 19 00 RSP: 0018:ffff8801d9ac5f30 EFLAGS: 00000293 ORIG_RAX: ffffffffffffffdb RAX: ffff8801d9ab81c0 RBX: 1ffff1003b358bec RCX: 1ffff1003b35715b RDX: 0000000000000000 RSI: ffffffff8164940b RDI: 0000000000000293 RBP: ffff8801d9ac60a8 R08: ffff8801d9ab8ad8 R09: 0000000000000006 R10: 0000000000000000 R11: ffff8801d9ab81c0 R12: 1ffffffff1263ebe R13: 0000000000000200 R14: ffff8801d9ac6080 R15: 0000000000000000 vprintk_default+0x28/0x30 kernel/printk/printk.c:1962 vprintk_func+0x7e/0x181 kernel/printk/printk_safe.c:398 printk+0xa7/0xcf kernel/printk/printk.c:1995 __find_get_block_slow fs/buffer.c:237 [inline] __find_get_block.cold.58+0xd8/0xff fs/buffer.c:1325 __getblk_slow fs/buffer.c:1058 [inline] __getblk_gfp+0x3d3/0x1030 fs/buffer.c:1351 __bread_gfp+0x2d/0x310 fs/buffer.c:1385 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:1176 [inline] __writeback_single_inode+0xf4a/0x1650 fs/fs-writeback.c:1375 writeback_sb_inodes+0x71f/0x1210 fs/fs-writeback.c:1580 __writeback_inodes_wb+0x1b9/0x340 fs/fs-writeback.c:1649 wb_writeback+0xa64/0xfb0 fs/fs-writeback.c:1758 ? Lost 77 message(s)!