__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-executor0:3889 blocked for more than 120 seconds. device loop0 blocksize: 4096 Not tainted 4.9.107-gdb2c520 #46 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. __find_get_block_slow() failed. block=1, b_blocknr=8 syz-executor0 D 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 28024 3889 1 0x00000004 ffff8801d868c800 __find_get_block_slow() failed. block=1, b_blocknr=8 ffff8801cd451a40b_state=0x00000029, b_size=512 ffff8801d8576f40device loop0 blocksize: 4096 ffff8801cb91b000 __find_get_block_slow() failed. block=1, b_blocknr=8 ffff88018a2e7b40b_state=0x00000029, b_size=512 ffffffff839e8c1ddevice loop0 blocksize: 4096 0000000000000002 __find_get_block_slow() failed. block=1, b_blocknr=8 ffffffff843b9ea3b_state=0x00000029, b_size=512 00ffffff81221500device loop0 blocksize: 4096 ffff8801db3224e8 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 [] schedule+0x7f/0x1b0 kernel/sched/core.c:3557 __find_get_block_slow() failed. block=1, b_blocknr=8 [] wb_wait_for_completion+0x149/0x1b0 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+0x207/0x300 fs/fs-writeback.c:2310 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:2327 [inline] [] writeback_inodes_sb+0x27/0x30 fs/fs-writeback.c:2342 __find_get_block_slow() failed. block=1, b_blocknr=8 [] __sync_filesystem fs/sync.c:35 [inline] [] sync_filesystem+0x93/0x240 fs/sync.c:63 b_state=0x00000029, b_size=512 [] generic_shutdown_super+0x75/0x300 fs/super.c:423 device loop0 blocksize: 4096 [] kill_block_super+0x9f/0x120 fs/super.c:1127 __find_get_block_slow() failed. block=1, b_blocknr=8 [] deactivate_locked_super+0x75/0xd0 fs/super.c:310 b_state=0x00000029, b_size=512 [] deactivate_super+0x91/0xd0 fs/super.c:341 device loop0 blocksize: 4096 [] cleanup_mnt+0xb2/0x160 fs/namespace.c:1134 __find_get_block_slow() failed. block=1, b_blocknr=8 [] __cleanup_mnt+0x16/0x20 fs/namespace.c:1141 b_state=0x00000029, b_size=512 [] task_work_run+0x10c/0x180 kernel/task_work.c:116 device loop0 blocksize: 4096 [] tracehook_notify_resume include/linux/tracehook.h:191 [inline] [] exit_to_usermode_loop+0xfc/0x120 arch/x86/entry/common.c:161 __find_get_block_slow() failed. block=1, b_blocknr=8 [] prepare_exit_to_usermode arch/x86/entry/common.c:191 [inline] [] syscall_return_slowpath arch/x86/entry/common.c:260 [inline] [] do_syscall_64+0x364/0x490 arch/x86/entry/common.c:287 b_state=0x00000029, b_size=512 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb device loop0 blocksize: 4096 Showing all locks held in the system: __find_get_block_slow() failed. block=1, b_blocknr=8 2 locks held by khungtaskd/519: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 4096 (rcu_read_lock__find_get_block_slow() failed. block=1, b_blocknr=8 ){......}b_state=0x00000029, b_size=512 , at: [] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline] , at: [] watchdog+0x11c/0xa20 kernel/hung_task.c:239 #1: (tasklist_lock __find_get_block_slow() failed. block=1, b_blocknr=8 ){.+.+..}b_state=0x00000029, b_size=512 , at: [] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336 __find_get_block_slow() failed. block=1, b_blocknr=8 1 lock held by rsyslogd/3676: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 4096 (&f->f_pos_lock){+.+.+.}__find_get_block_slow() failed. block=1, b_blocknr=8 , at: [] __fdget_pos+0xac/0xd0 fs/file.c:781 2 locks held by getty/3772: device loop0 blocksize: 4096 #0: (&tty->ldisc_sem __find_get_block_slow() failed. block=1, b_blocknr=8 ){++++++}b_state=0x00000029, b_size=512 , at: [] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock __find_get_block_slow() failed. block=1, b_blocknr=8 ){+.+...}b_state=0x00000029, b_size=512 , at: [] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2133 1 lock held by syz-executor0/3889: #0: __find_get_block_slow() failed. block=1, b_blocknr=8 (b_state=0x00000029, b_size=512 &type->s_umount_keydevice loop0 blocksize: 4096 #50){+.+...}, at: [] deactivate_super+0x89/0xd0 fs/super.c:340 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 ============================================= __find_get_block_slow() failed. block=1, b_blocknr=8 NMI backtrace for cpu 1 b_state=0x00000029, b_size=512 CPU: 1 PID: 519 Comm: khungtaskd Not tainted 4.9.107-gdb2c520 #46 device loop0 blocksize: 4096 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801d8697d08 __find_get_block_slow() failed. block=1, b_blocknr=8 ffffffff81eb3da9b_state=0x00000029, b_size=512 0000000000000000device loop0 blocksize: 4096 0000000000000001 __find_get_block_slow() failed. block=1, b_blocknr=8 0000000000000001b_state=0x00000029, b_size=512 ffffffff810b96a0device loop0 blocksize: 4096 ffff8801d8697d40 __find_get_block_slow() failed. block=1, b_blocknr=8 0000000000000001b_state=0x00000029, b_size=512 0000000000000000device loop0 blocksize: 4096 0000000000000003 __find_get_block_slow() failed. block=1, b_blocknr=8 [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 [] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 [] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60 device loop0 blocksize: 4096 [] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 __find_get_block_slow() failed. block=1, b_blocknr=8 [] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [] check_hung_task kernel/hung_task.c:125 [inline] [] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline] [] watchdog+0x6b4/0xa20 kernel/hung_task.c:239 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 [] kthread+0x26d/0x300 kernel/kthread.c:211 __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 [] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373 device loop0 blocksize: 4096 Sending NMI from CPU 1 to CPUs 0: __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 NMI backtrace for cpu 0 CPU: 0 PID: 4173 Comm: kworker/u4:4 Not tainted 4.9.107-gdb2c520 #46 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: writeback wb_workfnc (flush-7:0)c task: ffff8801cfef8000 task.stack: ffff880181698000 RIP: 0010:[] c [] __preempt_count_sub arch/x86/include/asm/preempt.h:74 [inline] RIP: 0010:[] c [] preempt_count_sub+0x66/0x160 kernel/sched/core.c:3285 RSP: 0018:ffff88018169f3e8 EFLAGS: 00000093 RAX: 0000000080000002 RBX: 00000000ffffffff RCX: 0000000000000000 RDX: 0000000000000002 RSI: 0000000000000001 RDI: ffffffff85b2d700 RBP: ffff88018169f3f0 R08: fffffbfff0b5efed R09: ffffffff85af7f66 R10: 0000000000000001 R11: ffffffff85af7f67 R12: 000000000000001e R13: 000000000000001e R14: 0000000000000002 R15: ffffffff85aec6a0 FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5e2380e000 CR3: 00000001cda5b000 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffffffff846d79e0c ffff88018169f408c ffffffff839f915cc 0000000000000004c ffff88018169f498c ffffffff8125f3b1c ffffffff85aec6a0c ffff88010000001ec ffff8801cfef8000c ffffed0039fdf118c ffff8801cfef88c8c ffffffff846defa0c Call Trace: [] __raw_spin_unlock include/linux/spinlock_api_smp.h:154 [inline] [] _raw_spin_unlock+0x2c/0x50 kernel/locking/spinlock.c:183 [] vprintk_emit+0x241/0x790 kernel/printk/printk.c:1890 [] vprintk+0x28/0x30 kernel/printk/printk.c:1913 [] vprintk_default+0x1d/0x30 kernel/printk/printk.c:1914 [] vprintk_func kernel/printk/internal.h:36 [inline] [] printk+0xaf/0xd7 kernel/printk/printk.c:1975 [] __find_get_block_slow.cold.57+0x82/0xf0 fs/buffer.c:242 [] __find_get_block+0x23e/0x4c0 fs/buffer.c:1360 [] __getblk_slow fs/buffer.c:1101 [inline] [] __getblk_gfp+0x189/0x710 fs/buffer.c:1386 [] __bread_gfp+0x2d/0x270 fs/buffer.c:1420 [] sb_bread include/linux/buffer_head.h:300 [inline] [] __fat_write_inode+0x2ab/0x980 fs/fat/inode.c:844 [] fat_write_inode+0x79/0x170 fs/fat/inode.c:893 [] write_inode fs/fs-writeback.c:1180 [inline] [] __writeback_single_inode+0x86d/0x1020 fs/fs-writeback.c:1379 [] writeback_sb_inodes+0x4ac/0xe70 fs/fs-writeback.c:1584 [] wb_writeback+0x2cf/0xbd0 fs/fs-writeback.c:1760 [] wb_do_writeback fs/fs-writeback.c:1894 [inline] [] wb_workfn+0x20e/0xdb0 fs/fs-writeback.c:1930 [] process_one_work+0x7e1/0x1500 kernel/workqueue.c:2092 [] worker_thread+0xd6/0x10a0 kernel/workqueue.c:2226 [] kthread+0x26d/0x300 kernel/kthread.c:211 [] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373 Code: c24 c97 c04 c85 cc9 c75 c1b c65 c8b c05 c37 ccb ce5 c7e c89 cc2 c81 ce2 cff cff cff c7f c39 cd3 c7f c14 c81 cfb cfe c00 c00 c00 c76 c71 cf7 cdb c65 c01 c1d c1a ccb ce5 c7e c<5b> c5d cc3 ce8 c12 cf1 cd2 c00 c85 cc0 c74 cf4 c48 cc7 cc7 c80 c29 cb9 c85 c48 cb8 c 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 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 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 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