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 INFO: task syz-executor0:8443 blocked for more than 140 seconds. b_state=0x00000029, b_size=512 Not tainted 4.20.0-rc2+ #335 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 syz-executor0 D17440 8443 6006 0x00000004 __find_get_block_slow() failed. block=2, b_blocknr=8 Call Trace: b_state=0x00000029, b_size=512 context_switch kernel/sched/core.c:2831 [inline] __schedule+0x8cf/0x21d0 kernel/sched/core.c:3472 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 schedule+0xfe/0x460 kernel/sched/core.c:3516 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 __rwsem_down_write_failed_common+0xc9a/0x15e0 kernel/locking/rwsem-xadd.c:577 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 rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:606 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __find_get_block_slow() failed. block=2, b_blocknr=8 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write_nested+0xa9/0x130 kernel/locking/rwsem.c:195 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 inode_lock_nested include/linux/fs.h:792 [inline] lock_rename+0x236/0x290 fs/namei.c:2862 __find_get_block_slow() failed. block=2, b_blocknr=8 do_renameat2+0x696/0x1180 fs/namei.c:4577 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_sys_renameat fs/namei.c:4668 [inline] __se_sys_renameat fs/namei.c:4665 [inline] __x64_sys_renameat+0x9a/0x100 fs/namei.c:4665 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 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457569 Code: Bad RIP value. RSP: 002b:00007f9bbdd59c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000108 __find_get_block_slow() failed. block=2, b_blocknr=8 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000457569 b_state=0x00000029, b_size=512 RDX: 0000000000000003 RSI: 00000000200003c0 RDI: 0000000000000003 device loop0 blocksize: 2048 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000580 R11: 0000000000000246 R12: 00007f9bbdd5a6d4 __find_get_block_slow() failed. block=2, b_blocknr=8 R13: 00000000004c3584 R14: 00000000004d5550 R15: 00000000ffffffff b_state=0x00000029, b_size=512 Showing all locks held in the system: device loop0 blocksize: 2048 1 lock held by khungtaskd/1008: #0: 00000000130d9b8b (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4379 __find_get_block_slow() failed. block=2, b_blocknr=8 1 lock held by rsyslogd/5876: b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 2 locks held by getty/5966: __find_get_block_slow() failed. block=2, b_blocknr=8 #0: 00000000936bd3e5 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 b_state=0x00000029, b_size=512 #1: 0000000026a7de50 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 device loop0 blocksize: 2048 2 locks held by getty/5967: #0: 000000005319d251 (&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: 00000000b2883da1 (&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/5968: device loop0 blocksize: 2048 #0: 00000000e6b3dbf1 (&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: 0000000087921d80 (&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 2 locks held by getty/5969: __find_get_block_slow() failed. block=2, b_blocknr=8 #0: 000000007118e191 (&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 #1: 00000000d1fe7c3b (&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/5970: b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 #0: 000000008f2546b3 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 b_state=0x00000029, b_size=512 #1: 000000001cd3079b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 device loop0 blocksize: 2048 __find_get_block_slow() failed. block=2, b_blocknr=8 2 locks held by getty/5971: b_state=0x00000029, b_size=512 #0: 0000000027c1de08 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 device loop0 blocksize: 2048 #1: 000000003e7e16d7 (&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/5972: #0: 000000000eff76c2 (&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: 000000009d4b75b4 (&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 syz-executor0/8443: device loop0 blocksize: 2048 #0: 00000000c6e8f14b (sb_writers#13){.+.+}, at: sb_start_write include/linux/fs.h:1597 [inline] #0: 00000000c6e8f14b (sb_writers#13){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360 __find_get_block_slow() failed. block=2, b_blocknr=8 #1: 0000000005a07de7 (&sb->s_type->i_mutex_key#22/1){+.+.}, at: inode_lock_nested include/linux/fs.h:792 [inline] #1: 0000000005a07de7 (&sb->s_type->i_mutex_key#22/1){+.+.}, at: lock_rename+0x236/0x290 fs/namei.c:2862 b_state=0x00000029, b_size=512 device loop0 blocksize: 2048 4 locks held by syz-executor0/8447: __find_get_block_slow() failed. block=2, b_blocknr=8 ============================================= NMI backtrace for cpu 1 b_state=0x00000029, b_size=512 CPU: 1 PID: 1008 Comm: khungtaskd Not tainted 4.20.0-rc2+ #335 device loop0 blocksize: 2048 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x244/0x39d lib/dump_stack.c:113 __find_get_block_slow() failed. block=2, b_blocknr=8 b_state=0x00000029, b_size=512 nmi_cpu_backtrace.cold.2+0x5c/0xa1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1e8/0x22a lib/nmi_backtrace.c:62 device loop0 blocksize: 2048 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 __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 kthread+0x35a/0x440 kernel/kthread.c:246 device loop0 blocksize: 2048 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: 8447 Comm: syz-executor0 Not tainted 4.20.0-rc2+ #335 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x50 kernel/kcov.c:97 Code: 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 d8 65 82 7e 81 e2 00 01 1f 00 RSP: 0018:ffff8881846768e8 EFLAGS: 00000046 RAX: ffffffff83e3a490 RBX: 0000000000000001 RCX: ffffc90005fde000 RDX: 1ffffffff175d265 RSI: ffffffff83e3a4a1 RDI: ffffffff8bae92e0 RBP: ffff8881846768e8 R08: ffffed10308ced10 R09: ffffed10308ced0f R10: ffffed10308ced0f R11: 0000000000000003 R12: ffffffff8bae92e0 R13: ffffffff8bae9530 R14: 0000000000000001 R15: ffffffff8bae9328 FS: 00007f9bbdd39700(0000) GS:ffff8881dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000001b5c9a000 CR4: 00000000001406f0 DR0: 000000000000b8c4 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: io_serial_in+0x11/0x90 drivers/tty/serial/8250/8250_port.c:448 serial_port_in include/linux/serial_core.h:271 [inline] serial8250_console_write+0x2c5/0xb10 drivers/tty/serial/8250/8250_port.c:3271 univ8250_console_write+0x5f/0x70 drivers/tty/serial/8250/8250_core.c:586 call_console_drivers kernel/printk/printk.c:1728 [inline] console_unlock+0xb1f/0x1190 kernel/printk/printk.c:2414 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+0x15e4/0x5150 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: 0033:0x457569 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:00007f9bbdd38c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569 RDX: 0000000000000000 RSI: 0000000000141042 RDI: 00000000200001c0 RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9bbdd396d4 R13: 00000000004f00bf R14: 00000000004d45c0 R15: 00000000ffffffff