b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 INFO: task syz-executor0:3864 blocked for more than 140 seconds. __find_get_block_slow() failed. block=1, b_blocknr=8 Not tainted 4.9.124-g09eb2ba #31 b_state=0x0000002b, 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=0x0000002b, b_size=512 device loop0 blocksize: 4096 26408 3864 1 0x00000004 b_state=0x0000002b, b_size=512 ffff8801b7958000 device loop0 blocksize: 4096 0000000000000000 ffff8801bc8039c0__find_get_block_slow() failed. block=1, b_blocknr=8 ffff8801982e6000b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 ffff8801db321c18 ffff8801a9f1fb40 __find_get_block_slow() failed. block=1, b_blocknr=8 ffffffff839f0afdb_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 0000000000000002b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 0000000041b58ab3 ffffffff843bbc94 __find_get_block_slow() failed. block=1, b_blocknr=8 00ffffff81223870b_state=0x0000002b, b_size=512 ffff8801db3224e8device loop0 blocksize: 4096 Call Trace: __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 [] schedule+0x7f/0x1b0 kernel/sched/core.c:3553 device loop0 blocksize: 4096 [] wb_wait_for_completion+0x149/0x1b0 fs/fs-writeback.c:221 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 [] __writeback_inodes_sb_nr+0x207/0x300 fs/fs-writeback.c:2310 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 [] writeback_inodes_sb_nr fs/fs-writeback.c:2327 [inline] [] writeback_inodes_sb+0x27/0x30 fs/fs-writeback.c:2342 b_state=0x0000002b, b_size=512 [] __sync_filesystem fs/sync.c:35 [inline] [] sync_filesystem+0x93/0x240 fs/sync.c:63 device loop0 blocksize: 4096 [] generic_shutdown_super+0x75/0x300 fs/super.c:423 __find_get_block_slow() failed. block=1, b_blocknr=8 [] kill_block_super+0x9f/0x120 fs/super.c:1127 b_state=0x0000002b, b_size=512 [] deactivate_locked_super+0x75/0xd0 fs/super.c:310 device loop0 blocksize: 4096 [] deactivate_super+0x91/0xd0 fs/super.c:341 __find_get_block_slow() failed. block=1, b_blocknr=8 [] cleanup_mnt+0xb2/0x160 fs/namespace.c:1143 b_state=0x0000002b, b_size=512 [] __cleanup_mnt+0x16/0x20 fs/namespace.c:1150 device loop0 blocksize: 4096 [] task_work_run+0x10c/0x180 kernel/task_work.c:116 __find_get_block_slow() failed. block=1, b_blocknr=8 [] tracehook_notify_resume include/linux/tracehook.h:191 [inline] [] exit_to_usermode_loop+0xfc/0x120 arch/x86/entry/common.c:161 b_state=0x0000002b, b_size=512 [] prepare_exit_to_usermode arch/x86/entry/common.c:191 [inline] [] syscall_return_slowpath arch/x86/entry/common.c:260 [inline] [] do_syscall_64+0x364/0x490 arch/x86/entry/common.c:287 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=0x0000002b, b_size=512 2 locks held by khungtaskd/519: device loop0 blocksize: 4096 #0: (rcu_read_lock __find_get_block_slow() failed. block=1, b_blocknr=8 ){......}b_state=0x0000002b, b_size=512 , at: [] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline] , at: [] watchdog+0x11c/0xa20 kernel/hung_task.c:239 #1: (tasklist_lock __find_get_block_slow() failed. block=1, b_blocknr=8 ){.+.?..}b_state=0x0000002b, b_size=512 , at: [] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336 1 lock held by rsyslogd/3678: __find_get_block_slow() failed. block=1, b_blocknr=8 #0: b_state=0x0000002b, 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/3774: b_state=0x0000002b, 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 1 lock held by syz-executor0/3864: device loop0 blocksize: 4096 #0: (&type->s_umount_key __find_get_block_slow() failed. block=1, b_blocknr=8 #41b_state=0x0000002b, b_size=512 ){++++..}device loop0 blocksize: 4096 , at: [] deactivate_super+0x89/0xd0 fs/super.c:340 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 1 lock held by init/25106: #0: __find_get_block_slow() failed. block=1, b_blocknr=8 (b_state=0x0000002b, 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/25138: b_state=0x0000002b, 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/25139: b_state=0x0000002b, 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/25140: b_state=0x0000002b, 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/25141: b_state=0x0000002b, 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/25142: b_state=0x0000002b, 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=0x0000002b, 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=0x0000002b, b_size=512 ffff8801d8607d08 device loop0 blocksize: 4096 ffffffff81eb95e9 0000000000000000 0000000000000000__find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 0000000000000000 device loop0 blocksize: 4096 0000000000000001 ffffffff810b9fa0 ffff8801d8607d40__find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 ffffffff81ec4927 device loop0 blocksize: 4096 0000000000000000 0000000000000000 0000000000000003__find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, 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=0x0000002b, 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=0x0000002b, 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=0x0000002b, 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=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 [] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373 device loop0 blocksize: 4096 Sending NMI from CPU 0 to CPUs 1: __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 NMI backtrace for cpu 1 CPU: 1 PID: 4927 Comm: kworker/u4:6 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: ffff8801982e6000 task.stack: ffff880198398000 RIP: 0010:[] c [] memset+0xf/0x40 mm/kasan/kasan.c:342 RSP: 0018:ffff88019839f390 EFLAGS: 00000092 RAX: 000000000000001e RBX: 0000000000000030 RCX: ffffffff8125c558 RDX: 0000000000000002 RSI: 0000000000000000 RDI: ffffffff85b162d6 RBP: ffff88019839f3a0 R08: 0000000000000001 R09: 0000000000000006 R10: ffffed0043fffa09 R11: 0000000000000001 R12: 0000000000000030 R13: 0000000000000000 R14: 0000000000000082 R15: ffffffff85b162a8 FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff51a692a30 CR3: 000000000461e000 CR4: 00000000001606f0 DR0: 0000000020000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Stack: 0000000000000030c ffffffff85b162b2c ffff88019839f408c ffffffff8125c558c 000000000000001ec 0000000000000000c 0000000400000002c 0000000000000000c 0000000000000000c 0000000000000000c 0000000000000004c 0000000000000000c Call Trace: [] log_store+0x288/0x490 kernel/printk/printk.c:585 [] log_output kernel/printk/printk.c:1768 [inline] [] vprintk_emit+0x21d/0x790 kernel/printk/printk.c:1887 [] 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 [] wb_writeback+0x2cf/0xbd0 fs/fs-writeback.c:1760 [] wb_do_writeback fs/fs-writeback.c:1894 [inline] [] wb_workfn+0x20e/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: cfc cff cff c5d cc3 cbe c6a c00 c00 c00 c48 cc7 cc7 c67 c82 c3c c84 ce8 cb6 c94 cbf cff c5d cc3 c0f c1f c40 c00 c55 c48 c89 ce5 c41 c55 c41 c89 cf5 c48 c8b c4d c08 c41 c54 c<49> c89 cd4 cba c01 c00 c00 c00 c53 c4c c89 ce6 c48 c89 cfb ce8 cfd cf8 cff cff c4c c device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x0000002b, b_size=512 device loop0 blocksize: 4096