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 INFO: task syz-executor0:17643 blocked for more than 140 seconds. b_state=0x00000029, b_size=512 Not tainted 4.9.112-g9e79039 #7 device loop0 blocksize: 4096 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 28920 17643 15831 0x00000004 b_state=0x00000029, b_size=512 ffff88019fa53000 device loop0 blocksize: 4096 ffff8801c5f82f40 ffff8801c5f81f80__find_get_block_slow() failed. block=1, b_blocknr=8 ffff8801d0854800b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 ffff8801db321c18 ffff8801ce0af6d0 ffffffff839e907d __find_get_block_slow() failed. block=1, b_blocknr=8 ffffffff81235667b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 0000000000000000 ffff88019fa538c0 0000000600000007 __find_get_block_slow() failed. block=1, b_blocknr=8 ffff8801db3224e8b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 Call Trace: __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 [] rwsem_down_read_failed+0x1e4/0x320 kernel/locking/rwsem-xadd.c:260 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 [] call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __find_get_block_slow() failed. block=1, b_blocknr=8 [] __down_read arch/x86/include/asm/rwsem.h:65 [inline] [] down_read+0x52/0xb0 kernel/locking/rwsem.c:24 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 [] inode_lock_shared include/linux/fs.h:776 [inline] [] lookup_slow+0x141/0x470 fs/namei.c:1645 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 [] walk_component+0x716/0x1bb0 fs/namei.c:1784 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 [] lookup_last fs/namei.c:2266 [inline] [] path_lookupat.isra.41+0x186/0x410 fs/namei.c:2283 [] filename_lookup.part.55+0x177/0x370 fs/namei.c:2317 [] filename_lookup fs/namei.c:2310 [inline] [] user_path_at_empty+0x53/0x70 fs/namei.c:2578 [] user_path_at include/linux/namei.h:55 [inline] [] do_utimes+0x17f/0x2c0 fs/utimes.c:155 device loop0 blocksize: 4096 [] SYSC_utime fs/utimes.c:38 [inline] [] SyS_utime+0xf7/0x150 fs/utimes.c:27 __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 [] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 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 , 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){.+.+..}, at: [] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 1 lock held by rsyslogd/3496: #0: __find_get_block_slow() failed. block=1, b_blocknr=8 (b_state=0x00000029, b_size=512 &f->f_pos_lockdevice loop0 blocksize: 4096 ){+.+.+.}, at: [] __fdget_pos+0xac/0xd0 fs/file.c:781 2 locks held by getty/3592: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 4096 (&tty->ldisc_sem){++++++}, at: [] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367 #1: b_state=0x00000029, b_size=512 (device loop0 blocksize: 4096 &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-executor0/17643: device loop0 blocksize: 4096 #0: (&sb->s_type->i_mutex_key __find_get_block_slow() failed. block=1, b_blocknr=8 #15b_state=0x00000029, b_size=512 ){++++++}device loop0 blocksize: 4096 , at: [] inode_lock_shared include/linux/fs.h:776 [inline] , at: [] lookup_slow+0x141/0x470 fs/namei.c:1645 1 lock held by syz-executor0/17653: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 4096 (&f->f_pos_lock){+.+.+.}, at: [] __fdget_pos+0xac/0xd0 fs/file.c:781 1 lock held by syz-executor0/17665: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 4096 (&f->f_pos_lock){+.+.+.}, at: [] __fdget_pos+0xac/0xd0 fs/file.c:781 2 locks held by syz-executor0/17673: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 4096 (sb_writers#10){.+.+.+}__find_get_block_slow() failed. block=1, b_blocknr=8 , at: [] sb_start_write include/linux/fs.h:1573 [inline] , at: [] mnt_want_write+0x3f/0xb0 fs/namespace.c:391 #1: device loop0 blocksize: 4096 (&sb->s_type->i_mutex_key#15){++++++}__find_get_block_slow() failed. block=1, b_blocknr=8 , 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 syz-executor0/17676: device loop0 blocksize: 4096 #0: (&sb->s_type->i_mutex_key#15 __find_get_block_slow() failed. block=1, b_blocknr=8 ){++++++}b_state=0x00000029, b_size=512 , at: [] inode_lock_shared include/linux/fs.h:776 [inline] , at: [] lookup_slow+0x141/0x470 fs/namei.c:1645 2 locks held by syz-executor0/17678: #0: __find_get_block_slow() failed. block=1, b_blocknr=8 (b_state=0x00000029, b_size=512 sb_writersdevice loop0 blocksize: 4096 #10){.+.+.+}, at: [] sb_start_write include/linux/fs.h:1573 [inline] #10){.+.+.+}, at: [] mnt_want_write+0x3f/0xb0 fs/namespace.c:391 #1: b_state=0x00000029, b_size=512 (device loop0 blocksize: 4096 &sb->s_type->i_mutex_key#14/1__find_get_block_slow() failed. block=1, b_blocknr=8 ){+.+.+.}b_state=0x00000029, b_size=512 , at: [] inode_lock_nested include/linux/fs.h:801 [inline] , at: [] filename_create+0x17a/0x490 fs/namei.c:3639 1 lock held by syz-executor0/17681: #0: __find_get_block_slow() failed. block=1, b_blocknr=8 (b_state=0x00000029, b_size=512 &f->f_pos_lockdevice loop0 blocksize: 4096 ){+.+.+.}, at: [] __fdget_pos+0xac/0xd0 fs/file.c:781 1 lock held by init/17692: b_state=0x00000029, 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/17693: b_state=0x00000029, 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/17694: b_state=0x00000029, 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/17695: b_state=0x00000029, 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/17696: b_state=0x00000029, 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=0x00000029, b_size=512 device loop0 blocksize: 4096 1 lock held by init/17697: #0: __find_get_block_slow() failed. block=1, b_blocknr=8 (b_state=0x00000029, 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 b_state=0x00000029, b_size=512 ============================================= device loop0 blocksize: 4096 NMI backtrace for cpu 1 CPU: 1 PID: 519 Comm: khungtaskd Not tainted 4.9.112-g9e79039 #7 __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=0x00000029, b_size=512 ffff8801d869fd08 device loop0 blocksize: 4096 ffffffff81eb3249 0000000000000000 0000000000000001__find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 0000000000000001 device loop0 blocksize: 4096 0000000000000001 ffffffff810b9bd0 ffff8801d869fd40__find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 ffffffff81ebe547 device loop0 blocksize: 4096 0000000000000001 0000000000000000 0000000000000002__find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 Call Trace: device loop0 blocksize: 4096 [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 [] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, 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: 4096 [] 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=1, b_blocknr=8 b_state=0x00000029, b_size=512 [] kthread+0x26d/0x300 kernel/kthread.c:211 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 [] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373 b_state=0x00000029, b_size=512 Sending NMI from CPU 1 to CPUs 0: device loop0 blocksize: 4096 NMI backtrace for cpu 0 CPU: 0 PID: 17639 Comm: syz-executor0 Not tainted 4.9.112-g9e79039 #7 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801cf7a4800 task.stack: ffff88019c910000 RIP: 0010:[] c [] arch_local_save_flags arch/x86/include/asm/paravirt.h:763 [inline] RIP: 0010:[] c [] arch_local_irq_save arch/x86/include/asm/paravirt.h:785 [inline] RIP: 0010:[] c [] lock_acquire+0x6e/0x3e0 kernel/locking/lockdep.c:3751 RSP: 0018:ffff88019c9175a8 EFLAGS: 00000246 RAX: 0000000000000246 RBX: ffff8801cf7a4800 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8801cf7a50c4 RBP: ffff88019c917610 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d61cf7a8 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fb114eed700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f084f666a30 CR3: 00000001cab9c000 CR4: 00000000001606f0 DR0: 00000000200001c0 DR1: 00000000200001c0 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Stack: ffffea0006e79f40c ffffea0006e79f40c 0000000000000001c dffffc0000000000c 0000000000000000c ffff8801d61cf688c ffff88019c917630c 000000018143a141c ffff8801d61cf790c 0000000000000000c ffffea0006e79f40c 0000000000000000c Call Trace: [] __raw_spin_lock include/linux/spinlock_api_smp.h:144 [inline] [] _raw_spin_lock+0x36/0x50 kernel/locking/spinlock.c:151 [] spin_lock include/linux/spinlock.h:302 [inline] [] __find_get_block_slow+0xe6/0x330 fs/buffer.c:216 [] __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_search_long+0x277/0x1180 fs/fat/dir.c:477 [] vfat_find+0x134/0x180 fs/fat/namei_vfat.c:708 [] vfat_lookup+0xe1/0x530 fs/fat/namei_vfat.c:731 [] lookup_real fs/namei.c:1522 [inline] [] __lookup_hash+0x11c/0x190 fs/namei.c:1542 [] filename_create+0x1a6/0x490 fs/namei.c:3640 [] user_path_create fs/namei.c:3697 [inline] [] SYSC_mknodat fs/namei.c:3764 [inline] [] SyS_mknodat fs/namei.c:3752 [inline] [] SYSC_mknod fs/namei.c:3798 [inline] [] SyS_mknod+0x18d/0x420 fs/namei.c:3796 [] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Code: cea c03 c0f cb6 c14 c02 c48 c89 cf8 c83 ce0 c07 c83 cc0 c03 c38 cd0 c7c c08 c84 cd2 c0f c85 cba c02 c00 c00 c8b c83 cc4 c08 c00 c00 c85 cc0 c0f c85 c0c c01 c00 c00 c9c c58 c<0f> c1f c44 c00 c00 c48 c89 cc3 cfa c66 c0f c1f c44 c00 c00 c65 c48 c8b c14 c25 cc0 c __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 __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