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-executor0:8525 blocked for more than 140 seconds. __find_get_block_slow() failed. block=2, b_blocknr=8 Not tainted 4.9.120-gf85543b #24 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 29384 8525 3712 0x00000004 ffff88019d160000 b_state=0x00000029, b_size=512 ffff8801cd456f40device loop0 blocksize: 2048 ffff8801c71cca80 ffff8801cecee000 ffff8801db321c18 b_state=0x00000029, b_size=512 ffff8801cf8bf808device loop0 blocksize: 2048 ffffffff839eedcd ffffffff81237347__find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 0000000000000000 device loop0 blocksize: 2048 ffff88019d1608c0 0000000600000007 ffff8801db3224e8__find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 Call Trace: device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 [] schedule+0x7f/0x1b0 kernel/sched/core.c:3553 __find_get_block_slow() failed. block=2, 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=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 [] call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105 __find_get_block_slow() failed. block=2, b_blocknr=8 [] __down_write arch/x86/include/asm/rwsem.h:125 [inline] [] down_write+0x5c/0xa0 kernel/locking/rwsem.c:54 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 [] inode_lock include/linux/fs.h:766 [inline] [] do_last fs/namei.c:3312 [inline] [] path_openat+0xed5/0x3590 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 [] do_sys_open+0x30d/0x5c0 fs/open.c:1072 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 [] SYSC_open fs/open.c:1090 [inline] [] SyS_open+0x2d/0x40 fs/open.c:1085 __find_get_block_slow() failed. block=2, b_blocknr=8 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){......}, 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: 2048 tasklist_lock){.+.+..}, at: [] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 1 lock held by rsyslogd/3519: #0: __find_get_block_slow() failed. block=2, b_blocknr=8 (b_state=0x00000029, b_size=512 &f->f_pos_lockdevice loop0 blocksize: 2048 ){+.+.+.}, at: [] __fdget_pos+0xac/0xd0 fs/file.c:781 2 locks held by getty/3615: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 2048 (&tty->ldisc_sem){++++++}__find_get_block_slow() failed. block=2, b_blocknr=8 , at: [] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367 #1: device loop0 blocksize: 2048 (&ldata->atomic_read_lock){+.+...}__find_get_block_slow() failed. block=2, b_blocknr=8 , at: [] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142 device loop0 blocksize: 2048 1 lock held by syz-executor0/8525: #0: __find_get_block_slow() failed. block=2, b_blocknr=8 (b_state=0x00000029, b_size=512 &sb->s_type->i_mutex_keydevice loop0 blocksize: 2048 #20__find_get_block_slow() failed. block=2, b_blocknr=8 ){++++++}b_state=0x00000029, b_size=512 , 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/8584: #0: __find_get_block_slow() failed. block=2, b_blocknr=8 (b_state=0x00000029, b_size=512 tty_mutexdevice loop0 blocksize: 2048 ){+.+.+.}, 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/8585: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 2048 (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/8586: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 2048 (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/8587: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 2048 (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/8588: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 2048 (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/8589: b_state=0x00000029, b_size=512 #0: device loop0 blocksize: 2048 (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: 2048 NMI backtrace for cpu 0 CPU: 0 PID: 519 Comm: khungtaskd Not tainted 4.9.120-gf85543b #24 __find_get_block_slow() failed. block=2, b_blocknr=8 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 b_state=0x00000029, b_size=512 ffff8801d866fd08 device loop0 blocksize: 2048 ffffffff81eb8049 0000000000000000 0000000000000000__find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 0000000000000000 device loop0 blocksize: 2048 0000000000000001 ffffffff810b9fa0 ffff8801d866fd40__find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 ffffffff81ec3357 device loop0 blocksize: 2048 0000000000000000 0000000000000000 0000000000000003__find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 Call Trace: device loop0 blocksize: 2048 [] __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 b_state=0x00000029, b_size=512 [] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373 device loop0 blocksize: 2048 Sending NMI from CPU 0 to CPUs 1: __find_get_block_slow() failed. block=2, b_blocknr=8 NMI backtrace for cpu 1 CPU: 1 PID: 8479 Comm: syz-executor0 Not tainted 4.9.120-gf85543b #24 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801cd96b000 task.stack: ffff88019da90000 RIP: 0010:[] c [] vsnprintf+0xfd/0x1840 lib/vsprintf.c:1988 RSP: 0018:ffff88019da97138 EFLAGS: 00000802 RAX: 0000000000000000 RBX: 00000000000003e0 RCX: ffffc90000a7e000 RDX: 1ffffffff0799d98 RSI: ffffffff81ee3288 RDI: 1ffff10033b52e30 RBP: ffff88019da97208 R08: 0000000000000001 R09: 0000000000000000 R10: ffff8801cd96b000 R11: 0000000000000000 R12: ffffffff83ccecc0 R13: ffff88019da971e0 R14: ffff88019da97338 R15: ffff88019da97338 FS: 00007f96cfc87700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f84b6c31000 CR3: 00000001c635d000 CR4: 00000000001606f0 Stack: ffff8801cd96b918c 00000000000001a3c 0000000000000002c 1ffff10033b52e30c ffff8801cd96b93ac 00000000000003e0c ffffffff85aee5e0c ffffffff85aee9c0c ffff88019da97338c 0000000041b58ab3c ffffffff843e4532c ffffffff81ee31a0c Call Trace: [] vscnprintf+0x2d/0x60 lib/vsprintf.c:2144 [] vprintk_emit+0xf4/0x790 kernel/printk/printk.c:1847 [] 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+0x37/0xf0 fs/buffer.c:238 [] __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_open fs/open.c:1090 [inline] [] SyS_open+0x2d/0x40 fs/open.c:1085 [] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Code: cff cff cff cff cff cff cff c48 cf7 cd0 c48 c89 c85 c58 cff cff cff ce8 c68 cd5 c47 cff c4c c89 ce2 c48 cb8 c00 c00 c00 c00 c00 cfc cff cdf c48 cc1 cea c03 c0f cb6 c04 c02 c<4c> c89 ce2 c83 ce2 c07 c38 cd0 c7f c08 c84 cc0 c0f c85 c67 c13 c00 c00 c48 cbf c00 c 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