__find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 INFO: task syz-executor0:17810 blocked for more than 140 seconds. device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 Not tainted 5.0.0-rc1+ #18 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. __find_get_block_slow() failed. block=1, b_blocknr=8 syz-executor0 D20440 17810 1 0x00000004 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 Call Trace: device loop0 blocksize: 4096 context_switch kernel/sched/core.c:2831 [inline] __schedule+0x897/0x1e60 kernel/sched/core.c:3472 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 schedule+0xfe/0x350 kernel/sched/core.c:3516 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3574 __find_get_block_slow() failed. block=1, b_blocknr=8 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0xa3b/0x1670 kernel/locking/mutex.c:1072 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 vfat_lookup+0xed/0x6b0 fs/fat/namei_vfat.c:709 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 __lookup_slow+0x2cd/0x560 fs/namei.c:1671 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 lookup_slow+0x58/0x80 fs/namei.c:1688 device loop0 blocksize: 4096 walk_component+0x8e5/0x26a0 fs/namei.c:1810 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 link_path_walk.part.0+0xa57/0x1550 fs/namei.c:2141 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 link_path_walk fs/namei.c:2072 [inline] path_openat+0x222/0x5650 fs/namei.c:3533 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 do_filp_open+0x26f/0x370 fs/namei.c:3564 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 do_sys_open+0x59a/0x7c0 fs/open.c:1063 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __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 __find_get_block_slow() failed. block=1, b_blocknr=8 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 entry_SYSCALL_64_after_hwframe+0x49/0xbe device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 RIP: 0033:0x455ef0 b_state=0x00000021, b_size=512 Code: Bad RIP value. device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 RSP: 002b:00007fff60af7950 EFLAGS: 00000206 ORIG_RAX: 0000000000000002 b_state=0x00000021, b_size=512 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000455ef0 device loop0 blocksize: 4096 RDX: 0000000000000000 RSI: 0000000000090800 RDI: 00000000004bc9af __find_get_block_slow() failed. block=1, b_blocknr=8 RBP: 000000000000049f R08: 0000000000000001 R09: 0000000000dcb940 b_state=0x00000021, b_size=512 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 device loop0 blocksize: 4096 R13: 00000000000d009a R14: 00000000000001af R15: 0000000000000000 __find_get_block_slow() failed. block=1, b_blocknr=8 Showing all locks held in the system: b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 1 lock held by khungtaskd/1039: b_state=0x00000021, b_size=512 #0: 00000000ea3ff34a (rcu_read_lock){....}, at: debug_show_all_locks+0xc6/0x41d kernel/locking/lockdep.c:4389 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 1 lock held by rsyslogd/8404: b_state=0x00000021, b_size=512 #0: 00000000477103d6 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1b3/0x1f0 fs/file.c:795 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 2 locks held by getty/8548: b_state=0x00000021, b_size=512 #0: 0000000056857e68 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 device loop0 blocksize: 4096 #1: 000000003bdc7969 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 __find_get_block_slow() failed. block=1, b_blocknr=8 2 locks held by getty/8549: b_state=0x00000021, b_size=512 #0: 0000000046fc8bc1 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 #1: 00000000bc717c7e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 b_state=0x00000021, b_size=512 2 locks held by getty/8550: device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 #0: 00000000b21ddb06 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 b_state=0x00000021, b_size=512 #1: 000000000b2579e4 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 device loop0 blocksize: 4096 2 locks held by getty/8551: __find_get_block_slow() failed. block=1, b_blocknr=8 #0: 0000000093fd1fa9 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 #1: 000000007016fa8e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 b_state=0x00000021, b_size=512 2 locks held by getty/8552: device loop0 blocksize: 4096 #0: 000000002374ed8b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 __find_get_block_slow() failed. block=1, b_blocknr=8 #1: 00000000eea0bd17 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 b_state=0x00000021, b_size=512 2 locks held by getty/8553: device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 #0: 00000000c3f6e30c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 b_state=0x00000021, b_size=512 #1: 00000000219f2f18 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 device loop0 blocksize: 4096 2 locks held by getty/8554: __find_get_block_slow() failed. block=1, b_blocknr=8 #0: 00000000988027b9 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 b_state=0x00000021, b_size=512 #1: 000000002ead019d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x30a/0x1eb0 drivers/tty/n_tty.c:2154 device loop0 blocksize: 4096 2 locks held by syz-executor0/17810: __find_get_block_slow() failed. block=1, b_blocknr=8 #0: 000000002f765a5f (&sb->s_type->i_mutex_key#26){++++}, at: inode_lock_shared include/linux/fs.h:767 [inline] #0: 000000002f765a5f (&sb->s_type->i_mutex_key#26){++++}, at: lookup_slow+0x4a/0x80 fs/namei.c:1687 b_state=0x00000021, b_size=512 #1: 000000007c9cdb76 (&sbi->s_lock){+.+.}, at: vfat_lookup+0xed/0x6b0 fs/fat/namei_vfat.c:709 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 6 locks held by syz-executor0/27380: b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 ============================================= __find_get_block_slow() failed. block=1, b_blocknr=8 NMI backtrace for cpu 0 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 CPU: 0 PID: 1039 Comm: khungtaskd Not tainted 5.0.0-rc1+ #18 __find_get_block_slow() failed. block=1, b_blocknr=8 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: b_state=0x00000021, b_size=512 __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1db/0x2d0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1be/0x236 lib/nmi_backtrace.c:62 device loop0 blocksize: 4096 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:203 [inline] watchdog+0xbbb/0x1170 kernel/hung_task.c:287 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000021, b_size=512 device loop0 blocksize: 4096 kthread+0x357/0x430 kernel/kthread.c:246 __find_get_block_slow() failed. block=1, b_blocknr=8 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: b_state=0x00000021, b_size=512 NMI backtrace for cpu 1 CPU: 1 PID: 27380 Comm: syz-executor0 Not tainted 5.0.0-rc1+ #18 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__sanitizer_cov_trace_pc+0x1/0x50 kernel/kcov.c:94 Code: fe ff ff 48 c7 05 4b 04 d5 09 00 00 00 00 48 89 85 68 fe ff ff e9 85 df ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 <48> 89 e5 48 8b 75 08 65 48 8b 04 25 40 ee 01 00 65 8b 15 a8 f6 7f RSP: 0018:ffff88805a82e530 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: 0000000000000001 RSI: ffffffff87ef1f9c RDI: 0000000000000005 RBP: ffff88805a82e660 R08: ffff88808bc76180 R09: ffffed100b505d12 R10: ffffed100b505d11 R11: ffff88805a82e888 R12: ffff88805a82e889 R13: ffff8880da82e887 R14: 0000000000000003 R15: ffff88805a82e889 FS: 0000000000dcb940(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c432f8f000 CR3: 0000000087332000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: vsnprintf+0x2a9/0x1b10 lib/vsprintf.c:2462 sprintf+0xc0/0x100 lib/vsprintf.c:2598 print_time kernel/printk/printk.c:1239 [inline] print_prefix kernel/printk/printk.c:1251 [inline] msg_print_text+0x3f3/0x450 kernel/printk/printk.c:1262 console_unlock+0x43f/0x11e0 kernel/printk/printk.c:2383 vprintk_emit+0x370/0x960 kernel/printk/printk.c:1931 vprintk_default+0x28/0x30 kernel/printk/printk.c:1958 vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398 printk+0xba/0xed kernel/printk/printk.c:1991 __find_get_block_slow fs/buffer.c:235 [inline] __find_get_block fs/buffer.c:1294 [inline] __find_get_block.cold+0x81/0xfb fs/buffer.c:1288 __getblk_slow fs/buffer.c:1039 [inline] __getblk_gfp+0x295/0xd20 fs/buffer.c:1320 __bread_gfp+0x2f/0x300 fs/buffer.c:1354 sb_bread include/linux/buffer_head.h:307 [inline] fat__get_entry+0x586/0xa40 fs/fat/dir.c:101 fat_get_entry fs/fat/dir.c:129 [inline] fat_search_long+0x345/0x17d0 fs/fat/dir.c:479 vfat_find+0x10e/0x140 fs/fat/namei_vfat.c:697 vfat_lookup+0x10a/0x6b0 fs/fat/namei_vfat.c:711 __lookup_slow+0x2cd/0x560 fs/namei.c:1671 lookup_slow+0x58/0x80 fs/namei.c:1688 walk_component+0x8e5/0x26a0 fs/namei.c:1810 link_path_walk.part.0+0xa57/0x1550 fs/namei.c:2141 link_path_walk fs/namei.c:2072 [inline] path_openat+0x222/0x5650 fs/namei.c:3533 do_filp_open+0x26f/0x370 fs/namei.c:3564 do_sys_open+0x59a/0x7c0 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+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x411e50 Code: 48 83 c4 08 48 3d 01 f0 ff ff 0f 83 da 17 00 00 c3 66 0f 1f 84 00 00 00 00 00 83 3d 3d 44 64 00 00 75 14 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 b4 17 00 00 c3 48 83 ec 08 e8 2a fa ff ff RSP: 002b:00007fff60af74e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007fff60af7514 RCX: 0000000000411e50 RDX: 00007fff60af751a RSI: 0000000000080001 RDI: 00000000004bd697 RBP: 00007fff60af7510 R08: 0000000000000000 R09: 0000000000000004 R10: 0000000000000075 R11: 0000000000000246 R12: 00000000004bd697 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000