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-executor0:10201 blocked for more than 120 seconds. __find_get_block_slow() failed. block=1, b_blocknr=8 Not tainted 4.9.96-g132f097 #9 b_state=0x00000029, b_size=512 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. device loop0 blocksize: 4096 syz-executor0 D __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 28776 10201 3862 0x00000004 b_state=0x00000029, b_size=512 ffff8801d5014800 device loop0 blocksize: 4096 ffff8801d4626a00 ffff8801d4626a00__find_get_block_slow() failed. block=1, b_blocknr=8 ffff8801d54a3000b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 ffff8801db321b98 ffff8801d4c275d0 ffffffff839e240d dffffc0000000000 ffff8801cbe043d0 __find_get_block_slow() failed. block=1, b_blocknr=8 ffff8801d4c27590b_state=0x00000029, b_size=512 00ff8801d50150c0device loop0 blocksize: 4096 ffff8801db322468 __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 [] d_wait_lookup fs/dcache.c:2433 [inline] [] d_alloc_parallel+0xe50/0x1720 fs/dcache.c:2509 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_slow+0x19c/0x470 fs/namei.c:1650 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 [] walk_component+0x716/0x1bb0 fs/namei.c:1784 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 [] link_path_walk+0x889/0x1200 fs/namei.c:2120 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 [] path_parentat.isra.38+0x4e/0x140 fs/namei.c:2338 device loop0 blocksize: 4096 [] filename_parentat.isra.53.part.54+0x173/0x3d0 fs/namei.c:2360 __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 [] filename_parentat fs/namei.c:3620 [inline] [] filename_create+0xce/0x490 fs/namei.c:3622 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 [] user_path_create fs/namei.c:3697 [inline] [] SYSC_mkdirat fs/namei.c:3841 [inline] [] SyS_mkdirat+0xbb/0x260 fs/namei.c:3833 __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 [] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 device loop0 blocksize: 4096 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb __find_get_block_slow() failed. block=1, b_blocknr=8 Showing all locks held in the system: b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 2 locks held by khungtaskd/518: __find_get_block_slow() failed. block=1, b_blocknr=8 #0: b_state=0x00000029, b_size=512 (device loop0 blocksize: 4096 rcu_read_lock){......}, at: [] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline] rcu_read_lock){......}, at: [] watchdog+0x11c/0xa20 kernel/hung_task.c:239 #1: b_state=0x00000029, b_size=512 (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/3672: #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/3768: b_state=0x00000029, 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:2133 device loop0 blocksize: 4096 1 lock held by syz-executor0/10201: #0: __find_get_block_slow() failed. block=1, b_blocknr=8 (b_state=0x00000029, b_size=512 &sb->s_type->i_mutex_keydevice loop0 blocksize: 4096 #17){++++++}, at: [] inode_lock_shared include/linux/fs.h:776 [inline] #17){++++++}, at: [] lookup_slow+0x141/0x470 fs/namei.c:1645 1 lock held by init/10216: 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/10217: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 4096 (__find_get_block_slow() failed. block=1, b_blocknr=8 tty_mutexb_state=0x00000029, b_size=512 ){+.+.+.}device 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/10218: 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/10219: 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/10220: 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 NMI backtrace for cpu 0 CPU: 0 PID: 518 Comm: khungtaskd Not tainted 4.9.96-g132f097 #9 __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 ffff8801d8497d08 device loop0 blocksize: 4096 ffffffff81eb0b69 0000000000000000 0000000000000000__find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 0000000000000000 device loop0 blocksize: 4096 0000000000000001 ffffffff810b7d60 ffff8801d8497d40__find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 ffffffff81ebbe97 device loop0 blocksize: 4096 0000000000000000 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 0 to CPUs 1: device loop0 blocksize: 4096 NMI backtrace for cpu 1 CPU: 1 PID: 10150 Comm: syz-executor0 Not tainted 4.9.96-g132f097 #9 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801d5016000 task.stack: ffff8801d6f28000 RIP: 0010:[] c [] mark_held_locks+0xe4/0x130 kernel/locking/lockdep.c:2648 RSP: 0018:ffff8801d6f2f2b0 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 0000000000000002 RCX: 1ffff1003aa02d22 RDX: 1ffffffff0a7eee8 RSI: ffff8801d50168f0 RDI: ffffffff853f7740 RBP: ffff8801d6f2f2f0 R08: ffff8801d5016910 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d50168c8 R13: ffffed003aa02d18 R14: ffff8801d5016000 R15: dffffc0000000000 FS: 00007fbfcec81700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd2f2df000 CR3: 00000001da226000 CR4: 0000000000160670 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Stack: ffff8801d5016000c ffff8801d50168c0c 0000000200000003c ffff8801d5016000c ffffffff81621ac3c dffffc0000000000c ffff8801d5de20a8c 000000000000000fc ffff8801d6f2f310c ffffffff81233ae6c 0000000000000010c 0000000000000000c 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 [] lookup_bh_lru fs/buffer.c:1344 [inline] [] __find_get_block+0x183/0x4c0 fs/buffer.c:1356 [] __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_slow+0x23e/0x470 fs/namei.c:1668 [] walk_component+0x716/0x1bb0 fs/namei.c:1784 [] link_path_walk+0x889/0x1200 fs/namei.c:2120 [] path_parentat.isra.38+0x4e/0x140 fs/namei.c:2338 [] filename_parentat.isra.53.part.54+0x173/0x3d0 fs/namei.c:2360 [] filename_parentat fs/namei.c:3620 [inline] [] filename_create+0xce/0x490 fs/namei.c:3622 [] user_path_create fs/namei.c:3697 [inline] [] SYSC_mkdirat fs/namei.c:3841 [inline] [] SyS_mkdirat+0xbb/0x260 fs/namei.c:3833 [] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Code: c55 cd0 ca8 c04 c74 c0c c4c c89 cf7 ce8 cb9 cec cff cff c85 cc0 c74 c1e c41 c0f cb6 c45 c00 c83 cc3 c01 c84 cc0 c74 c04 c3c c03 c7e c40 c41 c39 c9e cc0 c08 c00 c00 c7f ca1 c c01 c00 c00 c00 c48 c83 cc4 c18 c5b c41 c5c c41 c5d c41 c5e c41 c5f c5d cc3 c48 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