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-executor0:19904 blocked for more than 140 seconds. __find_get_block_slow() failed. block=2, b_blocknr=8 Not tainted 4.9.123-g8dd3fc2 #27 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 29656 19904 3867 0x00000004 b_state=0x00000029, b_size=512 ffff8801d4773000 device loop0 blocksize: 2048 ffff8801d47d39c0 ffff8801a8cef9c0__find_get_block_slow() failed. block=2, b_blocknr=8 ffff8801c16d1800b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 ffff8801db221c18 ffff8801a9b2f808 __find_get_block_slow() failed. block=2, b_blocknr=8 ffffffff839f0dbdb_state=0x00000029, b_size=512 ffffffff81237907device loop0 blocksize: 2048 0000000000000000 ffff8801d47738c0 __find_get_block_slow() failed. block=2, b_blocknr=8 0000000600000007b_state=0x00000029, b_size=512 ffff8801db2224e8device loop0 blocksize: 2048 Call Trace: __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 device loop0 blocksize: 2048 [] do_sys_open+0x30d/0x5c0 fs/open.c:1072 __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 [] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 device loop0 blocksize: 2048 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb __find_get_block_slow() failed. block=2, b_blocknr=8 Showing all locks held in the system: b_state=0x00000029, b_size=512 2 locks held by khungtaskd/519: device loop0 blocksize: 2048 #0: (rcu_read_lock __find_get_block_slow() failed. block=2, b_blocknr=8 ){......}b_state=0x00000029, 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=2, b_blocknr=8 ){.+.+..}b_state=0x00000029, b_size=512 , at: [] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336 1 lock held by rsyslogd/3681: __find_get_block_slow() failed. block=2, b_blocknr=8 #0: b_state=0x00000029, b_size=512 (device loop0 blocksize: 2048 &f->f_pos_lock){+.+.+.}, at: [] __fdget_pos+0xac/0xd0 fs/file.c:781 2 locks held by getty/3777: 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 2 locks held by syz-executor0/19904: #0: __find_get_block_slow() failed. block=2, b_blocknr=8 (b_state=0x00000029, b_size=512 sb_writersdevice loop0 blocksize: 2048 #18){.+.+.+}, at: [] sb_start_write include/linux/fs.h:1573 [inline] #18){.+.+.+}, at: [] mnt_want_write+0x3f/0xb0 fs/namespace.c:391 #1: b_state=0x00000029, b_size=512 (device loop0 blocksize: 2048 &sb->s_type->i_mutex_key#24){++++++}__find_get_block_slow() failed. block=2, b_blocknr=8 , 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 device loop0 blocksize: 2048 ============================================= NMI backtrace for cpu 0 __find_get_block_slow() failed. block=2, b_blocknr=8 CPU: 0 PID: 519 Comm: khungtaskd Not tainted 4.9.123-g8dd3fc2 #27 b_state=0x00000029, b_size=512 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 device loop0 blocksize: 2048 ffff8801d8657d08 ffffffff81eb9689 __find_get_block_slow() failed. block=2, b_blocknr=8 0000000000000000b_state=0x00000029, b_size=512 0000000000000000device loop0 blocksize: 2048 0000000000000000 0000000000000001 __find_get_block_slow() failed. block=2, b_blocknr=8 ffffffff810b9fa0b_state=0x00000029, b_size=512 ffff8801d8657d40device loop0 blocksize: 2048 ffffffff81ec49c7 0000000000000000 __find_get_block_slow() failed. block=2, b_blocknr=8 0000000000000000b_state=0x00000029, b_size=512 0000000000000003device loop0 blocksize: 2048 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=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 b_state=0x00000029, b_size=512 NMI backtrace for cpu 1 CPU: 1 PID: 19902 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #27 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801c797e000 task.stack: ffff8801cc208000 RIP: 0010:[] c [] __read_once_size include/linux/compiler.h:243 [inline] RIP: 0010:[] c [] __sanitizer_cov_trace_pc+0x3b/0x50 kernel/kcov.c:105 RSP: 0018:ffff8801cc20eff8 EFLAGS: 00000046 RAX: 0000000000040000 RBX: ffff8801cc20f080 RCX: ffffc90000ab6000 RDX: 000000000003ffff RSI: ffffffff81ed9671 RDI: ffff8801cc20f085 RBP: ffff8801cc20eff8 R08: fffffbfff0b5dcc8 R09: fffffbfff0b5dcc6 R10: fffffbfff0b5dcc7 R11: ffffffff85aee63a R12: ffffffff85aee63b R13: ffff8801cc20f1e0 R14: 0000000000000000 R15: 000000000000000a FS: 00007fb1f9792700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c42bc25000 CR3: 00000001ca642000 CR4: 00000000001606f0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Stack: ffff8801cc20f128c ffffffff81ed9671c 0000000000000025c ffff8801cc20f100c ffffffff85aee62ac 20ff8801b6401140c 1ffff10039841e0cc ffffffff00000001c 0a00001000000006c 0000000000000200c ffff880100000002c fffffffe00000000c Call Trace: [] number+0x131/0xa80 lib/vsprintf.c:409 [] vsnprintf+0x118a/0x1840 lib/vsprintf.c:2107 [] 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+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__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: c8c c6f ccb c7e c81 ce2 c00 c01 c1f c00 c48 c8b c75 c08 c75 c2b c8b c90 c80 c12 c00 c00 c83 cfa c02 c75 c20 c48 c8b c88 c88 c12 c00 c00 c8b c80 c84 c12 c00 c00 c48 c8b c11 c<48> c83 cc2 c01 c48 c39 cd0 c76 c07 c48 c89 c34 cd1 c48 c89 c11 c5d cc3 c0f c1f c00 c 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 b_state=0x00000029, b_size=512