__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 INFO: task syz-executor0:346 blocked for more than 140 seconds. device loop0 blocksize: 2048 Not tainted 4.20.0-rc7+ #157 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. __find_get_block_slow() failed. block=2, b_blocknr=8 syz-executor0 D17944 346 6018 0x00000004 b_state=0x00000029, b_size=512 Call Trace: device loop0 blocksize: 2048 context_switch kernel/sched/core.c:2831 [inline] __schedule+0x8cf/0x21d0 kernel/sched/core.c:3472 __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 schedule+0xfe/0x460 kernel/sched/core.c:3516 __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 __rwsem_down_write_failed_common+0xc9a/0x15e0 kernel/locking/rwsem-xadd.c:577 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 rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:606 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 b_state=0x00000029, b_size=512 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0xa5/0x130 kernel/locking/rwsem.c:72 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 inode_lock include/linux/fs.h:757 [inline] do_last fs/namei.c:3321 [inline] path_openat+0x15c4/0x5150 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 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 do_filp_open+0x255/0x380 fs/namei.c:3564 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+0x568/0x700 fs/open.c:1063 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 __do_sys_open fs/open.c:1081 [inline] __se_sys_open fs/open.c:1076 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1076 device loop0 blocksize: 2048 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 __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 entry_SYSCALL_64_after_hwframe+0x49/0xbe b_state=0x00000029, b_size=512 RIP: 0033:0x457669 device loop0 blocksize: 2048 Code: Bad RIP value. __find_get_block_slow() failed. block=2, b_blocknr=8 RSP: 002b:00007f47a1036c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457669 RDX: 0000000000000000 RSI: 0000000000141042 RDI: 0000000020000200 b_state=0x00000029, b_size=512 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f47a10376d4 b_state=0x00000029, b_size=512 R13: 00000000004f179f R14: 00000000004d5508 R15: 00000000ffffffff device loop0 blocksize: 2048 Showing all locks held in the system: __find_get_block_slow() failed. block=2, b_blocknr=8 1 lock held by khungtaskd/1019: b_state=0x00000029, b_size=512 #0: 000000008cdf6a83 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4379 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 1 lock held by rsyslogd/5888: b_state=0x00000029, b_size=512 2 locks held by getty/5978: #0: 00000000f6f464b6 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000dcb9753c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 2 locks held by getty/5979: device loop0 blocksize: 2048 #0: 00000000c9c9c388 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 __find_get_block_slow() failed. block=2, b_blocknr=8 #1: 00000000cf6383ee (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 b_state=0x00000029, b_size=512 2 locks held by getty/5980: device loop0 blocksize: 2048 #0: 0000000069a336d8 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 __find_get_block_slow() failed. block=2, b_blocknr=8 #1: 00000000af6b35f4 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 b_state=0x00000029, b_size=512 2 locks held by getty/5981: device loop0 blocksize: 2048 #0: 0000000078540558 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 __find_get_block_slow() failed. block=2, b_blocknr=8 #1: 00000000a2de7a87 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 b_state=0x00000029, b_size=512 2 locks held by getty/5982: device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 #0: 00000000d3c61675 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 #1: 000000003bd6617a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 2 locks held by getty/5983: b_state=0x00000029, b_size=512 #0: 00000000be412203 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 device loop0 blocksize: 2048 #1: 000000008b104f69 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 __find_get_block_slow() failed. block=2, b_blocknr=8 2 locks held by getty/5984: b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 #0: 000000008c1359ba (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 __find_get_block_slow() failed. block=2, b_blocknr=8 #1: 00000000ab0a5062 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 b_state=0x00000029, b_size=512 1 lock held by syz-executor0/346: device loop0 blocksize: 2048 #0: 00000000e7a1835f (&sb->s_type->i_mutex_key#21){++++}, at: inode_lock include/linux/fs.h:757 [inline] #0: 00000000e7a1835f (&sb->s_type->i_mutex_key#21){++++}, at: do_last fs/namei.c:3321 [inline] #0: 00000000e7a1835f (&sb->s_type->i_mutex_key#21){++++}, at: path_openat+0x15c4/0x5150 fs/namei.c:3534 __find_get_block_slow() failed. block=2, b_blocknr=8 6 locks held by syz-executor0/352: b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 ============================================= NMI backtrace for cpu 1 __find_get_block_slow() failed. block=2, b_blocknr=8 CPU: 1 PID: 1019 Comm: khungtaskd Not tainted 4.20.0-rc7+ #157 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 b_state=0x00000029, b_size=512 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x244/0x39d lib/dump_stack.c:113 nmi_cpu_backtrace.cold.2+0x5c/0xa1 lib/nmi_backtrace.c:101 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 nmi_trigger_cpumask_backtrace+0x1e8/0x22a lib/nmi_backtrace.c:62 b_state=0x00000029, b_size=512 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0xb51/0x1060 kernel/hung_task.c:289 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 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: __find_get_block_slow() failed. block=2, b_blocknr=8 NMI backtrace for cpu 0 CPU: 0 PID: 352 Comm: syz-executor0 Not tainted 4.20.0-rc7+ #157 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 kernel/kcov.c:94 Code: 14 dd 28 00 00 00 4d 39 d0 72 1b 49 83 c1 01 4a 89 7c 10 e0 4a 89 74 10 e8 4a 89 54 10 f0 4a 89 4c d8 20 4c 89 08 5d c3 66 90 <55> 48 89 e5 48 8b 75 08 65 48 8b 04 25 40 ee 01 00 65 8b 15 48 69 RSP: 0018:ffff888182376708 EFLAGS: 00000082 RAX: 0000000000040000 RBX: 00000000fffffffe RCX: ffffc90005fe7000 RDX: 0000000000040000 RSI: ffffffff87d6544d RDI: 0000000000000005 RBP: ffff888182376830 R08: ffff8881ce096380 R09: fffffbfff1617074 R10: fffffbfff1617074 R11: ffffffff8b0b83a0 R12: 0000000000000001 R13: 000000000000000a R14: 0000000000000002 R15: ffffffff8b0b83a3 FS: 00007f47a1016700(0000) GS:ffff8881dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000001b5b87000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: vsnprintf+0x13d0/0x1b60 lib/vsprintf.c:2362 sprintf+0xb0/0xe0 lib/vsprintf.c:2498 print_time kernel/printk/printk.c:1228 [inline] print_prefix+0x26a/0x3f0 kernel/printk/printk.c:1251 msg_print_text+0xcc/0x1d0 kernel/printk/printk.c:1278 console_unlock+0x4e6/0x1190 kernel/printk/printk.c:2388 vprintk_emit+0x391/0x990 kernel/printk/printk.c:1922 vprintk_default+0x28/0x30 kernel/printk/printk.c:1964 vprintk_func+0x7e/0x181 kernel/printk/printk_safe.c:398 printk+0xa7/0xcf kernel/printk/printk.c:1997 __find_get_block_slow fs/buffer.c:231 [inline] __find_get_block.cold.57+0x3a/0xff fs/buffer.c:1294 __getblk_slow fs/buffer.c:1039 [inline] __getblk_gfp+0x2b3/0xd50 fs/buffer.c:1320 __bread_gfp+0x2d/0x310 fs/buffer.c:1354 sb_bread include/linux/buffer_head.h:307 [inline] fat__get_entry+0x5a6/0xa40 fs/fat/dir.c:101 fat_get_entry fs/fat/dir.c:129 [inline] fat_get_short_entry+0x13c/0x2c0 fs/fat/dir.c:878 fat_scan+0x10f/0x340 fs/fat/dir.c:963 msdos_find+0x10e/0x320 fs/fat/namei_msdos.c:129 msdos_lookup+0x13c/0x320 fs/fat/namei_msdos.c:209 lookup_open+0x72e/0x1b90 fs/namei.c:3213 do_last fs/namei.c:3324 [inline] path_openat+0x2464/0x5150 fs/namei.c:3534 do_filp_open+0x255/0x380 fs/namei.c:3564 do_sys_open+0x568/0x700 fs/open.c:1063 __do_sys_open fs/open.c:1081 [inline] __se_sys_open fs/open.c:1076 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1076 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457669 Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f47a1015c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457669 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000800 RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f47a10166d4 R13: 00000000004f179f R14: 00000000004d5508 R15: 00000000ffffffff