b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 INFO: task syz-executor0:11276 blocked for more than 140 seconds. __find_get_block_slow() failed. block=2, b_blocknr=8 Not tainted 4.9.117-g8b21e85 #19 b_state=0x00000029, b_size=512 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. device loop0 blocksize: 2048 syz-executor0 D __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 28904 11276 7529 0x00000004 b_state=0x00000029, b_size=512 ffff8801a0fd0000 device loop0 blocksize: 2048 ffff8801c7eeef40 ffff8801c7eeef40 ffff8801c5e20000__find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 ffff8801db321c18 device loop0 blocksize: 2048 ffff88019d9d76c8 ffffffff839ebd0d__find_get_block_slow() failed. block=2, b_blocknr=8 dffffc0000000000b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 ffff8801b74be110 ffff88019d9d7688 __find_get_block_slow() failed. block=2, b_blocknr=8 00ff8801a0fd08c0b_state=0x00000029, b_size=512 ffff8801db3224e8 device loop0 blocksize: 2048 [] schedule+0x7f/0x1b0 kernel/sched/core.c:3553 __find_get_block_slow() failed. block=2, b_blocknr=8 [] d_wait_lookup fs/dcache.c:2455 [inline] [] d_alloc_parallel+0xeb2/0x17c0 fs/dcache.c:2537 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 [] lookup_open+0x4ba/0x1930 fs/namei.c:3134 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 [] do_last fs/namei.c:3315 [inline] [] path_openat+0x1803/0x3590 fs/namei.c:3534 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 [] do_filp_open+0x197/0x270 fs/namei.c:3568 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 [] do_sys_open+0x30d/0x5c0 fs/open.c:1072 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 [] SYSC_open fs/open.c:1090 [inline] [] SyS_open+0x2d/0x40 fs/open.c:1085 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 [] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 __find_get_block_slow() failed. block=2, b_blocknr=8 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb b_state=0x00000029, b_size=512 Showing all locks held in the system: device loop0 blocksize: 2048 2 locks held by khungtaskd/519: __find_get_block_slow() failed. block=2, b_blocknr=8 #0: b_state=0x00000029, b_size=512 (device loop0 blocksize: 2048 rcu_read_lock){......}__find_get_block_slow() failed. block=2, 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: 2048 (tasklist_lock){.+.+..}__find_get_block_slow() failed. block=2, b_blocknr=8 , at: [] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 1 lock held by rsyslogd/3675: device loop0 blocksize: 2048 #0: (&f->f_pos_lock __find_get_block_slow() failed. block=2, b_blocknr=8 ){+.+.+.}b_state=0x00000029, b_size=512 , at: [] __fdget_pos+0xac/0xd0 fs/file.c:781 2 locks held by getty/3771: #0: __find_get_block_slow() failed. block=2, b_blocknr=8 (b_state=0x00000029, b_size=512 &tty->ldisc_semdevice loop0 blocksize: 2048 ){++++++}, at: [] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367 #1: b_state=0x00000029, b_size=512 (device loop0 blocksize: 2048 &ldata->atomic_read_lock){+.+...}, at: [] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142 b_state=0x00000029, b_size=512 1 lock held by syz-executor0/11276: device loop0 blocksize: 2048 #0: (&sb->s_type->i_mutex_key __find_get_block_slow() failed. block=2, b_blocknr=8 #15b_state=0x00000029, b_size=512 ){++++++}device loop0 blocksize: 2048 , at: [] inode_lock_shared include/linux/fs.h:776 [inline] , at: [] do_last fs/namei.c:3314 [inline] , at: [] path_openat+0x17dc/0x3590 fs/namei.c:3534 2 locks held by syz-executor0/11281: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 2048 (sb_writers#10__find_get_block_slow() failed. block=2, b_blocknr=8 ){.+.+.+}b_state=0x00000029, b_size=512 , at: [] sb_start_write include/linux/fs.h:1573 [inline] , at: [] mnt_want_write+0x3f/0xb0 fs/namespace.c:391 #1: (&sb->s_type->i_mutex_key __find_get_block_slow() failed. block=2, b_blocknr=8 #15b_state=0x00000029, b_size=512 ){++++++}device loop0 blocksize: 2048 , at: [] inode_lock include/linux/fs.h:766 [inline] , at: [] do_last fs/namei.c:3312 [inline] , at: [] path_openat+0xed5/0x3590 fs/namei.c:3534 1 lock held by init/11672: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 2048 (tty_mutex){+.+.+.}__find_get_block_slow() failed. block=2, b_blocknr=8 , 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/11673: device loop0 blocksize: 2048 #0: (tty_mutex){+.+.+.} __find_get_block_slow() failed. block=2, b_blocknr=8 , 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/11674: device loop0 blocksize: 2048 #0: (tty_mutex){+.+.+.} __find_get_block_slow() failed. block=2, b_blocknr=8 , 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/11675: device loop0 blocksize: 2048 #0: (tty_mutex){+.+.+.} __find_get_block_slow() failed. block=2, b_blocknr=8 , 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/11676: device loop0 blocksize: 2048 #0: (tty_mutex){+.+.+.} __find_get_block_slow() failed. block=2, b_blocknr=8 , at: [] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline] , at: [] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125 device loop0 blocksize: 2048 ============================================= NMI backtrace for cpu 0 __find_get_block_slow() failed. block=2, b_blocknr=8 CPU: 0 PID: 519 Comm: khungtaskd Not tainted 4.9.117-g8b21e85 #19 b_state=0x00000029, b_size=512 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 device loop0 blocksize: 2048 ffff8801d86c7d08 ffffffff81eb4be9 0000000000000000 __find_get_block_slow() failed. block=2, b_blocknr=8 0000000000000000b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 0000000000000000 0000000000000001 ffffffff810b9bd0 __find_get_block_slow() failed. block=2, b_blocknr=8 ffff8801d86c7d40b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 ffffffff81ebfee7 0000000000000000 0000000000000000 __find_get_block_slow() failed. block=2, b_blocknr=8 0000000000000003b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 [] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 [] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60 b_state=0x00000029, b_size=512 [] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 device loop0 blocksize: 2048 [] 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 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 [] kthread+0x26d/0x300 kernel/kthread.c:211 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 [] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373 b_state=0x00000029, b_size=512 Sending NMI from CPU 0 to CPUs 1: device loop0 blocksize: 2048 NMI backtrace for cpu 1 CPU: 1 PID: 11269 Comm: syz-executor0 Not tainted 4.9.117-g8b21e85 #19 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801a94dc800 task.stack: ffff88019adc8000 RIP: 0010:[] c [] mark_held_locks+0x22/0x130 kernel/locking/lockdep.c:2643 RSP: 0018:ffff88019adcf1b8 EFLAGS: 00000096 RAX: ffff8801a94dd0c0 RBX: ffff8801a94dc800 RCX: 0000000000000000 RDX: 1ffff1003529ba18 RSI: 0000000000000000 RDI: ffff8801a94dc800 RBP: ffff88019adcf1f8 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff8125f477 R13: 000000000000001c R14: ffff8801a94dc800 R15: ffffffff85aec660 FS: 00007fc288b75700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f310ba04a30 CR3: 00000001cd34c000 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffffffff85aef0cac ffff88019adcf228c ffffffff8125a3e8c ffff8801a94dc800c ffffffff8125f477c 000000000000001cc 0000000000000002c ffffffff85aec660c ffff88019adcf218c ffffffff81235956c 0000000000000004c 000000000000001cc Call Trace: [] __trace_hardirqs_on_caller kernel/locking/lockdep.c:2681 [inline] [] trace_hardirqs_on_caller+0x266/0x590 kernel/locking/lockdep.c:2736 [] trace_hardirqs_on+0xd/0x10 kernel/locking/lockdep.c:2743 [] vprintk_emit+0x257/0x790 kernel/printk/printk.c:1892 [] 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+0xcd/0xf0 fs/buffer.c:244 [] __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__get_entry+0x4c8/0x8f0 fs/fat/dir.c:100 [] fat_get_entry fs/fat/dir.c:128 [inline] [] fat_get_short_entry+0x131/0x2a0 fs/fat/dir.c:876 [] fat_scan+0xfd/0x340 fs/fat/dir.c:961 [] msdos_find+0xf9/0x2d0 fs/fat/namei_msdos.c:128 [] msdos_lookup+0x135/0x250 fs/fat/namei_msdos.c:208 [] lookup_open+0x63d/0x1930 fs/namei.c:3203 [] do_last fs/namei.c:3315 [inline] [] path_openat+0x1803/0x3590 fs/namei.c:3534 [] do_filp_open+0x197/0x270 fs/namei.c:3568 [] do_sys_open+0x30d/0x5c0 fs/open.c:1072 [] SYSC_openat fs/open.c:1099 [inline] [] SyS_openat+0x30/0x40 fs/open.c:1093 [] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Code: c30 c00 ce9 cd7 cfa cff cff c66 c90 c55 c48 c8d c87 cc0 c08 c00 c00 c48 c89 ce5 c48 c89 cc2 c41 c57 c41 c56 c48 cc1 cea c03 c49 c89 cfe c41 c55 c41 c54 c53 c48 c83 cec c18 c<48> c89 c45 cc8 c48 cb8 c00 c00 c00 c00 c00 cfc cff cdf c0f cb6 c04 c02 c84 cc0 c74 c __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8