device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 INFO: task syz-executor0:21003 blocked for more than 140 seconds. b_state=0x00000029, b_size=512 Not tainted 4.9.119-g9dc978d #23 device loop0 blocksize: 4096 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 29432 21003 3874 0x00000004 b_state=0x00000029, b_size=512 ffff8801971e4800 device loop0 blocksize: 4096 ffff8801cca94540 ffff8801cb555500__find_get_block_slow() failed. block=2, b_blocknr=16 ffff8801cca16000b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 ffff8801db221c18 ffff8801ab8cf728 __find_get_block_slow() failed. block=2, b_blocknr=16 ffffffff839ebdcdb_state=0x00000029, b_size=512 ffffffff81235627device loop0 blocksize: 4096 0000000000000000 ffff8801971e50c0 0000000600000007 __find_get_block_slow() failed. block=2, b_blocknr=16 ffff8801db2224e8b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 Call Trace: __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 [] schedule+0x7f/0x1b0 kernel/sched/core.c:3553 device loop0 blocksize: 4096 [] __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:526 [inline] [] rwsem_down_write_failed+0x598/0x990 kernel/locking/rwsem-xadd.c:555 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 [] call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105 device loop0 blocksize: 4096 [] __down_write arch/x86/include/asm/rwsem.h:125 [inline] [] down_write+0x5c/0xa0 kernel/locking/rwsem.c:54 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 [] inode_lock include/linux/fs.h:766 [inline] [] do_truncate2+0x128/0x1f0 fs/open.c:61 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 [] handle_truncate fs/namei.c:2990 [inline] [] do_last fs/namei.c:3419 [inline] [] path_openat+0x251e/0x3590 fs/namei.c:3534 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 [] do_filp_open+0x197/0x270 fs/namei.c:3568 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 [] do_sys_open+0x30d/0x5c0 fs/open.c:1072 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 [] 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 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 [] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 b_state=0x00000029, b_size=512 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb device loop0 blocksize: 4096 Showing all locks held in the system: 2 locks held by khungtaskd/519: __find_get_block_slow() failed. block=2, b_blocknr=16 #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 1 lock held by rsyslogd/3680: device loop0 blocksize: 4096 #0: (&f->f_pos_lock){+.+.+.} __find_get_block_slow() failed. block=2, b_blocknr=16 , at: [] __fdget_pos+0xac/0xd0 fs/file.c:781 2 locks held by getty/3776: device loop0 blocksize: 4096 #0: (&tty->ldisc_sem){++++++} __find_get_block_slow() failed. block=2, b_blocknr=16 , 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=2, b_blocknr=16 ){+.+...}b_state=0x00000029, b_size=512 , at: [] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142 2 locks held by syz-executor0/21003: __find_get_block_slow() failed. block=2, b_blocknr=16 #0: b_state=0x00000029, b_size=512 (device loop0 blocksize: 4096 sb_writers#15){.+.+.+}__find_get_block_slow() failed. block=2, b_blocknr=16 , at: [] sb_start_write include/linux/fs.h:1573 [inline] , at: [] mnt_want_write+0x3f/0xb0 fs/namespace.c:391 #1: device loop0 blocksize: 4096 (&sb->s_type->i_mutex_key#20__find_get_block_slow() failed. block=2, b_blocknr=16 ){++++++}b_state=0x00000029, b_size=512 , at: [] inode_lock include/linux/fs.h:766 [inline] , at: [] do_truncate2+0x128/0x1f0 fs/open.c:61 2 locks held by syz-executor0/21005: #0: __find_get_block_slow() failed. block=2, b_blocknr=16 (b_state=0x00000029, b_size=512 sb_writersdevice loop0 blocksize: 4096 #15){.+.+.+}, at: [] sb_start_write include/linux/fs.h:1573 [inline] #15){.+.+.+}, 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=2, b_blocknr=16 , at: [] inode_lock include/linux/fs.h:766 [inline] , at: [] fat_fallocate+0x10e/0x2d0 fs/fat/file.c:249 device loop0 blocksize: 4096 ============================================= NMI backtrace for cpu 1 __find_get_block_slow() failed. block=2, b_blocknr=16 CPU: 1 PID: 519 Comm: khungtaskd Not tainted 4.9.119-g9dc978d #23 b_state=0x00000029, b_size=512 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 device loop0 blocksize: 4096 ffff8801d8457d08 ffffffff81eb4be9 __find_get_block_slow() failed. block=2, b_blocknr=16 0000000000000000b_state=0x00000029, b_size=512 0000000000000001device loop0 blocksize: 4096 0000000000000001 0000000000000001 __find_get_block_slow() failed. block=2, b_blocknr=16 ffffffff810b9bd0b_state=0x00000029, b_size=512 ffff8801d8457d40device loop0 blocksize: 4096 ffffffff81ebfee7 0000000000000001 __find_get_block_slow() failed. block=2, b_blocknr=16 0000000000000000b_state=0x00000029, b_size=512 0000000000000003device loop0 blocksize: 4096 Call Trace: [] __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=16 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=2, b_blocknr=16 [] 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=2, b_blocknr=16 b_state=0x00000029, b_size=512 [] kthread+0x26d/0x300 kernel/kthread.c:211 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 [] 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: 20935 Comm: syz-executor0 Not tainted 4.9.119-g9dc978d #23 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801975b9800 task.stack: ffff88019bd50000 RIP: 0010:[] c [] lock_is_held+0x8e/0x140 kernel/locking/lockdep.c:3793 RSP: 0018:ffff88019bd577e0 EFLAGS: 00000807 RAX: ffff8801975ba0c4 RBX: 0000000000000246 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff81f1c62b RDI: ffff8801975ba0c4 RBP: ffff88019bd577f8 R08: ffff8801975ba160 R09: 0000000000000001 R10: ffff8801975b9800 R11: 1ffff10032eb7427 R12: ffff8801975b9800 R13: ffffffff846defa0 R14: 0000000000000000 R15: ffff8801cbfc5f88 FS: 00007fa0bee86700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f040bd10000 CR3: 00000001bc01d000 CR4: 00000000001606f0 DR0: ffffffffffffffff DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Stack: ffffea00061f77c0c ffff8801bb3cac38c dffffc0000000000c ffff88019bd57808c ffffffff8127c244c ffff88019bd57870c ffffffff814391bbc ffffffff81438e70c ffffed0032eb7418c ffff8801975ba0c8c 0000000000000002c ffff8801cbfc5f90c Call Trace: [] 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_ent_bread+0x160/0x2f0 fs/fat/fatent.c:106 [] fat_ent_read_block fs/fat/fatent.c:441 [inline] [] fat_alloc_clusters+0x51b/0xe10 fs/fat/fatent.c:489 [] fat_add_cluster+0x6f/0xe0 fs/fat/inode.c:100 [] fat_fallocate+0x23c/0x2d0 fs/fat/file.c:262 [] vfs_fallocate+0x359/0x600 fs/open.c:329 [] SYSC_fallocate fs/open.c:352 [inline] [] SyS_fallocate+0x53/0x90 fs/open.c:346 [] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Code: c00 c00 c65 c4c c8b c24 c25 cc0 c7d c01 c00 c49 c8d cbc c24 cc4 c08 c00 c00 c48 cb8 c00 c00 c00 c00 c00 cfc cff cdf c48 c89 cfa c48 cc1 cea c03 c0f cb6 c14 c02 c48 c89 cf8 c<83> ce0 c07 c83 cc0 c03 c38 cd0 c7c c08 c84 cd2 c0f c85 c8f c00 c00 c00 c41 cc7 c84 c __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16