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-executor0:12182 blocked for more than 140 seconds. __find_get_block_slow() failed. block=1, b_blocknr=8 Not tainted 4.9.117-g8b21e85 #19 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 27368 12182 11219 0x00000004 b_state=0x00000029, b_size=512 ffff8801cb8db000 device loop0 blocksize: 4096 ffff8801c7ef4fc0 ffff8801c7ef4fc0__find_get_block_slow() failed. block=1, b_blocknr=8 ffff8801bb824800b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 ffff8801db321c18 ffff88019ba37b88 __find_get_block_slow() failed. block=1, b_blocknr=8 ffffffff839ebd0db_state=0x00000029, b_size=512 ffffffff81235687device loop0 blocksize: 4096 0000000000000000 ffff8801cb8db8c0 __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 [] call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105 b_state=0x00000029, b_size=512 [] __down_write arch/x86/include/asm/rwsem.h:125 [inline] [] down_write+0x5c/0xa0 kernel/locking/rwsem.c:54 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 [] inode_lock include/linux/fs.h:766 [inline] [] fat_fallocate+0x10e/0x2d0 fs/fat/file.c:249 b_state=0x00000029, b_size=512 [] vfs_fallocate+0x359/0x600 fs/open.c:329 device loop0 blocksize: 4096 [] SYSC_fallocate fs/open.c:352 [inline] [] SyS_fallocate+0x53/0x90 fs/open.c:346 __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/519: #0: __find_get_block_slow() failed. block=1, b_blocknr=8 (b_state=0x00000029, b_size=512 rcu_read_lockdevice loop0 blocksize: 4096 ){......}, at: [] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline] ){......}, 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/3667: #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/3763: 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:2142 device loop0 blocksize: 4096 2 locks held by syz-executor0/12182: #0: __find_get_block_slow() failed. block=1, b_blocknr=8 (b_state=0x00000029, b_size=512 sb_writersdevice loop0 blocksize: 4096 #14){.+.+.+}, at: [] sb_start_write include/linux/fs.h:1573 [inline] #14){.+.+.+}, at: [] vfs_fallocate+0x2fb/0x600 fs/open.c:328 #1: b_state=0x00000029, b_size=512 (device loop0 blocksize: 4096 &sb->s_type->i_mutex_key#20){++++++}__find_get_block_slow() failed. block=1, b_blocknr=8 , at: [] inode_lock include/linux/fs.h:766 [inline] , at: [] fat_fallocate+0x10e/0x2d0 fs/fat/file.c:249 2 locks held by syz-executor0/12185: 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#20){++++++}__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 1 lock held by init/12267: device loop0 blocksize: 4096 #0: (tty_mutex __find_get_block_slow() failed. block=1, b_blocknr=8 ){+.+.+.}b_state=0x00000029, b_size=512 , 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/12268: #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 1 lock held by init/12270: 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/12271: 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/12272: 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 1 CPU: 1 PID: 519 Comm: khungtaskd Not tainted 4.9.117-g8b21e85 #19 __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 ffff8801d8427d08 device loop0 blocksize: 4096 ffffffff81eb4be9 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 ffff8801d8427d40__find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 ffffffff81ebfee7 device loop0 blocksize: 4096 0000000000000001 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 __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: 1617 Comm: kworker/u4:3 Not tainted 4.9.117-g8b21e85 #19 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: writeback wb_workfnc (flush-7:0)c task: ffff8801cf87b000 task.stack: ffff8801cf920000 RIP: 0010:[] c [] __lock_is_held+0x8/0xf0 kernel/locking/lockdep.c:3590 RSP: 0018:ffff8801cf927418 EFLAGS: 00000046 RAX: 0000000000000007 RBX: 0000000000000246 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff81f1c62b RDI: ffffffff846defa0 RBP: ffff8801cf927428 R08: ffff8801cf87b960 R09: 0000000000000001 R10: ffff8801cf87b000 R11: 1ffff10039f0f727 R12: ffff8801cf87b000 R13: ffffffff846defa0 R14: 0000000000000000 R15: ffff8801cbf8b748 FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000176ab10 CR3: 00000001d77fd000 CR4: 00000000001606f0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Stack: 0000000000000000c ffff8801cbf8b748c ffff8801cf927450c ffffffff81230a94c ffffea00071e3ac0c ffff8801cbe4ac30c dffffc0000000000c ffff8801cf927460c ffffffff8127c284c ffff8801cf9274c8c ffffffff814391bbc ffffffff81438e70c Call Trace: [] lock_is_held+0xb4/0x140 kernel/locking/lockdep.c:3794 [] rcu_read_lock_held+0xa4/0xc0 kernel/rcu/update.c:297 [] radix_tree_deref_slot include/linux/radix-tree.h:199 [inline] [] find_get_entry+0x34b/0x540 mm/filemap.c:1095 [] pagecache_get_page+0x4b/0x720 mm/filemap.c:1201 [] find_get_page_flags include/linux/pagemap.h:264 [inline] [] __find_get_block_slow+0xc2/0x330 fs/buffer.c:212 [] __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: c48 c89 cf7 c48 c89 c75 cd0 ce8 c57 cbd c30 c00 c48 c8b c75 cd0 ce9 c26 cfc cff cff c0f c1f c40 c00 c66 c2e c0f c1f c84 c00 c00 c00 c00 c00 c55 c48 c89 ce5 c41 c57 c41 c56 c<49> c89 cfe c41 c55 c41 c54 c53 c65 c48 c8b c1c c25 cc0 c7d c01 c00 c48 c8d c83 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