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-executor0:23687 blocked for more than 140 seconds. __find_get_block_slow() failed. block=1, b_blocknr=8 Not tainted 4.9.119-g9dc978d #23 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 29432 23687 3726 0x00000004 ffff8801c8778000 b_state=0x00000029, b_size=512 ffff8801cd094a80device loop0 blocksize: 4096 ffff8801c444f480 ffff8801d373e000__find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 ffff8801db321c18 device loop0 blocksize: 4096 ffff8801ab8df728 ffffffff839ebdcd__find_get_block_slow() failed. block=1, b_blocknr=8 ffffffff81235627b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 0000000000000000 ffff8801c87788c0 __find_get_block_slow() failed. block=1, b_blocknr=8 0000000600000007b_state=0x00000029, b_size=512 ffff8801db3224e8device 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:3553 __find_get_block_slow() failed. block=1, 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: 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 [] call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105 __find_get_block_slow() failed. block=1, 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: 4096 [] inode_lock include/linux/fs.h:766 [inline] [] do_truncate2+0x128/0x1f0 fs/open.c:61 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 [] handle_truncate fs/namei.c:2990 [inline] [] do_last fs/namei.c:3419 [inline] [] path_openat+0x251e/0x3590 fs/namei.c:3534 __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_filp_open+0x197/0x270 fs/namei.c:3568 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 [] do_sys_open+0x30d/0x5c0 fs/open.c:1072 __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 [] SYSC_open fs/open.c:1090 [inline] [] SyS_open fs/open.c:1085 [inline] [] SYSC_creat fs/open.c:1110 [inline] [] SyS_creat+0x27/0x30 fs/open.c:1108 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 [] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 __find_get_block_slow() failed. block=1, 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: 4096 2 locks held by khungtaskd/520: __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 2 locks held by getty/3629: #0: __find_get_block_slow() failed. block=1, b_blocknr=8 (b_state=0x00000029, b_size=512 &tty->ldisc_semdevice loop0 blocksize: 4096 ){++++++}, 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 2 locks held by syz-executor0/23687: device loop0 blocksize: 4096 #0: (sb_writers __find_get_block_slow() failed. block=1, b_blocknr=8 #14b_state=0x00000029, b_size=512 ){.+.+.+}device loop0 blocksize: 4096 , at: [] sb_start_write include/linux/fs.h:1573 [inline] , 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#17){++++++}__find_get_block_slow() failed. block=1, b_blocknr=8 , at: [] inode_lock include/linux/fs.h:766 [inline] , at: [] do_truncate2+0x128/0x1f0 fs/open.c:61 2 locks held by syz-executor0/23779: device loop0 blocksize: 4096 #0: (sb_writers#14 __find_get_block_slow() failed. block=1, b_blocknr=8 ){.+.+.+}b_state=0x00000029, b_size=512 , at: [] sb_start_write include/linux/fs.h:1573 [inline] , at: [] vfs_fallocate+0x2fb/0x600 fs/open.c:328 #1: (&sb->s_type->i_mutex_key __find_get_block_slow() failed. block=1, b_blocknr=8 #17b_state=0x00000029, b_size=512 ){++++++}device loop0 blocksize: 4096 , at: [] inode_lock include/linux/fs.h:766 [inline] , at: [] fat_fallocate+0x10e/0x2d0 fs/fat/file.c:249 b_state=0x00000029, b_size=512 ============================================= device loop0 blocksize: 4096 NMI backtrace for cpu 0 CPU: 0 PID: 520 Comm: khungtaskd Not tainted 4.9.119-g9dc978d #23 __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 ffff8801d85b7d08 device loop0 blocksize: 4096 ffffffff81eb4be9 0000000000000000 0000000000000000__find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 0000000000000000 device loop0 blocksize: 4096 0000000000000001 ffffffff810b9bd0 ffff8801d85b7d40__find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 ffffffff81ebfee7 device loop0 blocksize: 4096 0000000000000000 0000000000000000 0000000000000003__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 [] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373 __find_get_block_slow() failed. block=1, b_blocknr=8 Sending NMI from CPU 0 to CPUs 1: b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 NMI backtrace for cpu 1 CPU: 1 PID: 4015 Comm: kworker/u4:5 Not tainted 4.9.119-g9dc978d #23 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: writeback wb_workfnc (flush-7:0)c task: ffff88019cb66000 task.stack: ffff88019cba0000 RIP: 0010:[] c [] logbuf_has_space kernel/printk/printk.c:465 [inline] RIP: 0010:[] c [] log_make_free_space+0x1a4/0x260 kernel/printk/printk.c:492 RSP: 0018:ffff88019cba72e0 EFLAGS: 00000016 RAX: ffff88019cb66000 RBX: 0000000000008564 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff81258e0e RDI: 000000000000002c RBP: ffff88019cba7338 R08: 0000000000000000 R09: 000000000000001c R10: fffffbfff0b5d8cf R11: ffffffff85aec67c R12: 0000000000000050 R13: 0000000000055205 R14: 0000000000008514 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f41c39df000 CR3: 000000019c11f000 CR4: 00000000001606f0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Stack: fffffbfff0b5da11c ffffffff85aed088c 00037aec00008564c 0000000000056530c 000000000000003cc ffffffff85aed080c 0000000000000000c 000000000000002cc 000000000000001cc 000000000000001cc 0000000000000000c ffff88019cba73a0c Call Trace: [] log_store+0x59/0x490 kernel/printk/printk.c:549 [] 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+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_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 [] __writeback_inodes_wb+0xfb/0x1e0 fs/fs-writeback.c:1653 [] wb_writeback+0x512/0xbd0 fs/fs-writeback.c:1762 [] wb_check_old_data_flush fs/fs-writeback.c:1877 [inline] [] wb_do_writeback fs/fs-writeback.c:1901 [inline] [] wb_workfn+0x850/0xdb0 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: c8d c04 c73 c12 ce8 cde c5c c10 c00 c4c c89 c2d ce7 c42 c8d c04 c89 c1d ca1 c42 c8d c04 ce8 ccc c5c c10 c00 c41 c39 cde c77 c62 ce8 cc2 c5c c10 c00 c4c c39 c6d cc0 c74 c57 c cb7 c5c c10 c00 c44 c29 cf3 ce8 caf c5c c10 c00 c48 c3b c5d cc8 c19 cdb ce8 ca4 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