__find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 INFO: task syz-executor0:30406 blocked for more than 140 seconds. device loop0 blocksize: 4096 Not tainted 4.9.124-g09eb2ba #31 "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=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 29432 30406 21173 0x00000004 b_state=0x0000012d, b_size=512 ffff8801d91c6000 device loop0 blocksize: 4096 ffff8801ada5aa00 ffff8801792424c0__find_get_block_slow() failed. block=1, b_blocknr=8 ffff8801a47c1800b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 ffff8801db221c18 ffff8801b65bf728 __find_get_block_slow() failed. block=1, b_blocknr=8 ffffffff839f0afdb_state=0x0000012d, b_size=512 ffffffff81237da7device loop0 blocksize: 4096 0000000000000000 ffff8801d91c68c0 __find_get_block_slow() failed. block=1, b_blocknr=8 0000000600000007b_state=0x0000012d, b_size=512 ffff8801db2224e8device loop0 blocksize: 4096 Call Trace: __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 [] schedule+0x7f/0x1b0 kernel/sched/core.c:3553 __find_get_block_slow() failed. block=1, b_blocknr=8 [] __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:526 [inline] [] rwsem_down_write_failed+0x598/0x990 kernel/locking/rwsem-xadd.c:555 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 [] call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105 __find_get_block_slow() failed. block=1, b_blocknr=8 [] __down_write arch/x86/include/asm/rwsem.h:125 [inline] [] down_write+0x5c/0xa0 kernel/locking/rwsem.c:54 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 [] inode_lock include/linux/fs.h:766 [inline] [] do_truncate2+0x128/0x1f0 fs/open.c:61 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 [] handle_truncate fs/namei.c:2990 [inline] [] do_last fs/namei.c:3419 [inline] [] path_openat+0x251e/0x3590 fs/namei.c:3534 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 [] do_filp_open+0x197/0x270 fs/namei.c:3568 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 [] do_sys_open+0x30d/0x5c0 fs/open.c:1072 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 [] SYSC_open fs/open.c:1090 [inline] [] SyS_open fs/open.c:1085 [inline] [] SYSC_creat fs/open.c:1110 [inline] [] SyS_creat+0x27/0x30 fs/open.c:1108 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 [] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 b_state=0x0000012d, 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=0x0000012d, b_size=512 #0: device loop0 blocksize: 4096 (rcu_read_lock){......}__find_get_block_slow() failed. block=1, b_blocknr=8 , at: [] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline] , at: [] watchdog+0x11c/0xa20 kernel/hung_task.c:239 #1: device loop0 blocksize: 4096 (tasklist_lock){.+.?..}__find_get_block_slow() failed. block=1, b_blocknr=8 , at: [] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336 device loop0 blocksize: 4096 1 lock held by rsyslogd/3683: __find_get_block_slow() failed. block=1, b_blocknr=8 #0: b_state=0x0000012d, b_size=512 (device loop0 blocksize: 4096 &f->f_pos_lock){+.+.+.}, at: [] __fdget_pos+0xac/0xd0 fs/file.c:781 2 locks held by getty/3779: b_state=0x0000012d, b_size=512 #0: device loop0 blocksize: 4096 (&tty->ldisc_sem){++++++}__find_get_block_slow() failed. block=1, b_blocknr=8 , at: [] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367 #1: device loop0 blocksize: 4096 (&ldata->atomic_read_lock){+.+.+.}__find_get_block_slow() failed. block=1, b_blocknr=8 , at: [] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142 device loop0 blocksize: 4096 2 locks held by syz-executor0/30406: #0: __find_get_block_slow() failed. block=1, b_blocknr=8 (b_state=0x0000012d, b_size=512 sb_writersdevice loop0 blocksize: 4096 #15){.+.+.+}, at: [] sb_start_write include/linux/fs.h:1573 [inline] #15){.+.+.+}, at: [] mnt_want_write+0x3f/0xb0 fs/namespace.c:391 #1: b_state=0x0000012d, b_size=512 (device loop0 blocksize: 4096 &sb->s_type->i_mutex_key#22){++++++}__find_get_block_slow() failed. block=1, b_blocknr=8 , at: [] inode_lock include/linux/fs.h:766 [inline] , at: [] do_truncate2+0x128/0x1f0 fs/open.c:61 1 lock held by syz-executor0/30408: device loop0 blocksize: 4096 #0: (&f->f_pos_lock __find_get_block_slow() failed. block=1, b_blocknr=8 ){+.+.+.}b_state=0x0000012d, b_size=512 , at: [] __fdget_pos+0xac/0xd0 fs/file.c:781 1 lock held by init/30474: #0: __find_get_block_slow() failed. block=1, b_blocknr=8 (b_state=0x0000012d, b_size=512 tty_mutexdevice loop0 blocksize: 4096 ){+.+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline] ){+.+.+.}, at: [] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125 1 lock held by init/30475: b_state=0x0000012d, b_size=512 #0: device loop0 blocksize: 4096 (tty_mutex){+.+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline] (tty_mutex){+.+.+.}, at: [] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125 1 lock held by init/30476: b_state=0x0000012d, b_size=512 #0: device loop0 blocksize: 4096 (tty_mutex){+.+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline] (tty_mutex){+.+.+.}, at: [] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125 #0: __find_get_block_slow() failed. block=1, b_blocknr=8 (b_state=0x0000012d, b_size=512 tty_mutexdevice loop0 blocksize: 4096 ){+.+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline] ){+.+.+.}, at: [] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125 1 lock held by init/30478: b_state=0x0000012d, b_size=512 #0: device loop0 blocksize: 4096 (tty_mutex){+.+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline] (tty_mutex){+.+.+.}, at: [] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125 b_state=0x0000012d, b_size=512 ============================================= device loop0 blocksize: 4096 NMI backtrace for cpu 0 CPU: 0 PID: 519 Comm: khungtaskd Not tainted 4.9.124-g09eb2ba #31 __find_get_block_slow() failed. block=1, b_blocknr=8 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 b_state=0x0000012d, b_size=512 ffff8801d84d7d08 device loop0 blocksize: 4096 ffffffff81eb95e9 0000000000000000 0000000000000000__find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 0000000000000000 device loop0 blocksize: 4096 0000000000000001 ffffffff810b9fa0 ffff8801d84d7d40__find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 ffffffff81ec4927 device loop0 blocksize: 4096 0000000000000000 0000000000000000 0000000000000003__find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 [] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 [] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60 __find_get_block_slow() failed. block=1, b_blocknr=8 [] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 b_state=0x0000012d, b_size=512 [] 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 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 [] kthread+0x26d/0x300 kernel/kthread.c:211 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 [] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 Sending NMI from CPU 0 to CPUs 1: __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 NMI backtrace for cpu 1 CPU: 1 PID: 6 Comm: kworker/u4:0 Not tainted 4.9.124-g09eb2ba #31 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: writeback wb_workfnc (flush-7:0)c task: ffff8801d9a38000 task.stack: ffff8801d9a40000 RIP: 0010:[] c [] trace_hardirqs_off_caller+0x1c9/0x280 kernel/locking/lockdep.c:2776 RSP: 0018:ffff8801d9a47318 EFLAGS: 00000002 RAX: 0000000000000007 RBX: ffffffff846d8040 RCX: 1ffff1003b34712c RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8801d9a388c4 RBP: ffff8801d9a47318 R08: ffff8801d9a38960 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000292 R13: 000000000000001e R14: 0000000000000002 R15: ffffffff85aee620 FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3bf90dba30 CR3: 000000019c8fc000 CR4: 00000000001606f0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Stack: ffff8801d9a47328c ffffffff8123142dc ffff8801d9a47350c ffffffff83a018f4c ffff8801d9a388c0c 0000000000000000c ffffffff846d8040c ffff8801d9a47378c ffffffff8122df53c 0000000000000002c 0000000000000000c ffffffff81261693c Call Trace: [] trace_hardirqs_off+0xd/0x10 kernel/locking/lockdep.c:2781 [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] [] _raw_spin_lock_irqsave+0x24/0x62 kernel/locking/spinlock.c:159 [] down_trylock+0x13/0x70 kernel/locking/semaphore.c:135 [] __down_trylock_console_sem kernel/printk/printk.c:220 [inline] [] console_trylock+0x22/0x150 kernel/printk/printk.c:2230 [] vprintk_emit+0x2b3/0x790 kernel/printk/printk.c:1902 [] 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:852 [] fat_write_inode+0x79/0x170 fs/fat/inode.c:901 [] 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 [] __writeback_inodes_wb+0xfb/0x1e0 fs/fs-writeback.c:1653 [] wb_writeback+0x512/0xbd0 fs/fs-writeback.c:1762 [] wb_check_background_flush fs/fs-writeback.c:1843 [inline] [] wb_do_writeback fs/fs-writeback.c:1902 [inline] [] wb_workfn+0x723/0xdb0 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: c89 ca3 c70 c08 c00 c00 c0f cb6 c14 c02 c48 c89 cf8 c83 ce0 c07 c83 cc0 c03 c38 cd0 c7c c08 c84 cd2 c0f c85 c97 c00 c00 c00 c44 c89 ca3 c8c c08 c00 c00 c5b c41 c5c c41 c5d c<5d> cc3 ce8 c60 ce8 ccb c00 c85 cc0 c74 cf0 c48 cc7 cc7 c40 c49 cb9 c85 c48 cb8 c00 c device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000012d, b_size=512