__find_get_block_slow() failed. block=3, b_blocknr=24 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=3, b_blocknr=24 b_state=0x00000029, b_size=512 INFO: task syz-executor0:10410 blocked for more than 120 seconds. device loop0 blocksize: 4096 Not tainted 4.16.0+ #13 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D23232 10410 4513 0x00000004 __find_get_block_slow() failed. block=3, b_blocknr=24 Call Trace: context_switch kernel/sched/core.c:2848 [inline] __schedule+0x8fb/0x1ef0 kernel/sched/core.c:3490 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=3, b_blocknr=24 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 schedule+0xf5/0x430 kernel/sched/core.c:3549 __find_get_block_slow() failed. block=3, b_blocknr=24 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 d_wait_lookup fs/dcache.c:2460 [inline] d_alloc_parallel+0x134a/0x1b40 fs/dcache.c:2542 __find_get_block_slow() failed. block=3, b_blocknr=24 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=3, b_blocknr=24 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=3, b_blocknr=24 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=3, b_blocknr=24 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=3, b_blocknr=24 lookup_slow+0x1e5/0x4d0 fs/namei.c:1617 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=3, b_blocknr=24 walk_component+0x89f/0x13d0 fs/namei.c:1763 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=3, b_blocknr=24 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=3, b_blocknr=24 link_path_walk+0xd4e/0x1470 fs/namei.c:2092 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=3, b_blocknr=24 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=3, b_blocknr=24 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=3, b_blocknr=24 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 path_lookupat+0xf3/0xba0 fs/namei.c:2280 __find_get_block_slow() failed. block=3, b_blocknr=24 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=3, b_blocknr=24 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=3, b_blocknr=24 do_o_path fs/namei.c:3479 [inline] path_openat+0x1d85/0x3590 fs/namei.c:3508 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=3, b_blocknr=24 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=3, b_blocknr=24 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=3, b_blocknr=24 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 do_filp_open+0x25b/0x3b0 fs/namei.c:3554 __find_get_block_slow() failed. block=3, b_blocknr=24 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=3, b_blocknr=24 do_sys_open+0x502/0x6d0 fs/open.c:1101 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=3, b_blocknr=24 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=3, b_blocknr=24 SYSC_openat fs/open.c:1128 [inline] SyS_openat+0x30/0x40 fs/open.c:1122 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=3, b_blocknr=24 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=3, b_blocknr=24 entry_SYSCALL_64_after_hwframe+0x42/0xb7 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=3, b_blocknr=24 RIP: 0033:0x4552d9 RSP: 002b:00007fda7842ec68 EFLAGS: 00000246 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=3, b_blocknr=24 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fda7842f6d4 RCX: 00000000004552d9 RDX: 0000000000200002 RSI: 0000000020000040 RDI: ffffffffffffff9c b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=3, b_blocknr=24 RBP: 000000000072bf58 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000420 R14: 00000000006f93a0 R15: 0000000000000001 Showing all locks held in the system: 2 locks held by khungtaskd/878: b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=3, b_blocknr=24 #0: 00000000a6ef2886 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 (rcu_read_lock){....}, at: check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] (rcu_read_lock){....}, at: watchdog+0x1d6/0xd70 kernel/hung_task.c:249 __find_get_block_slow() failed. block=3, b_blocknr=24 #1: 00000000d99ef5a7 ( b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=3, b_blocknr=24 tasklist_lock){.+.+}, at: debug_show_all_locks+0xd3/0x3d0 kernel/locking/lockdep.c:4470 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=3, b_blocknr=24 1 lock held by rsyslogd/4350: b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 #0: 000000004817821b ( __find_get_block_slow() failed. block=3, b_blocknr=24 &f->f_pos_lock){+.+.}, at: __fdget_pos+0x165/0x1a0 fs/file.c:766 b_state=0x00000029, b_size=512 2 locks held by getty/4441: #0: 000000003d843baf (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 device loop0 blocksize: 4096 #1: 00000000b9e53f1a (&ldata->atomic_read_lock __find_get_block_slow() failed. block=3, b_blocknr=24 ){+.+.}, at: n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4442: b_state=0x00000029, b_size=512 #0: 000000005a86d579 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: device loop0 blocksize: 4096 00000000dd5161e4 (&ldata->atomic_read_lock){+.+.} __find_get_block_slow() failed. block=3, b_blocknr=24 , at: n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4443: b_state=0x00000029, b_size=512 #0: 000000005b952116 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: device loop0 blocksize: 4096 00000000fb054a50 (&ldata->atomic_read_lock){+.+.} __find_get_block_slow() failed. block=3, b_blocknr=24 , at: n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4444: #0: 0000000088e6511e (&tty->ldisc_sem b_state=0x00000029, b_size=512 ){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000d38ad8bb (&ldata->atomic_read_lock){+.+.} device loop0 blocksize: 4096 , at: n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4445: __find_get_block_slow() failed. block=3, b_blocknr=24 #0: 00000000bbd28c78 ( b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=3, b_blocknr=24 &tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=3, b_blocknr=24 #1: 00000000e5a0afe4 ( b_state=0x00000029, b_size=512 &ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 device loop0 blocksize: 4096 2 locks held by getty/4446: #0: 0000000015fd8bad __find_get_block_slow() failed. block=3, b_blocknr=24 (&tty->ldisc_sem){++++} b_state=0x00000029, b_size=512 , at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000007b82da19 (&ldata->atomic_read_lock){+.+.} device loop0 blocksize: 4096 , at: n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4447: __find_get_block_slow() failed. block=3, b_blocknr=24 #0: 00000000b39c0f81 ( b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=3, b_blocknr=24 &tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 b_state=0x00000029, b_size=512 #1: 0000000013881aec (&ldata->atomic_read_lock device loop0 blocksize: 4096 ){+.+.}, at: n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 1 lock held by syz-executor0/10410: __find_get_block_slow() failed. block=3, b_blocknr=24 #0: 00000000a18e656c (&sb->s_type->i_mutex_key#16){++++}, at: inode_lock_shared include/linux/fs.h:723 [inline] #0: 00000000a18e656c (&sb->s_type->i_mutex_key#16){++++}, at: lookup_slow+0x18e/0x4d0 fs/namei.c:1612 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 878 Comm: khungtaskd Not tainted 4.16.0+ #13 __find_get_block_slow() failed. block=3, b_blocknr=24 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1a7/0x27d lib/dump_stack.c:53 b_state=0x00000029, b_size=512 nmi_cpu_backtrace+0x1e0/0x220 lib/nmi_backtrace.c:103 nmi_trigger_cpumask_backtrace+0x123/0x180 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline] check_hung_task kernel/hung_task.c:132 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline] watchdog+0x969/0xd70 kernel/hung_task.c:249 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=3, b_blocknr=24 b_state=0x00000029, b_size=512 kthread+0x33c/0x400 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:411 Sending NMI from CPU 1 to CPUs 0: device loop0 blocksize: 4096 NMI backtrace for cpu 0 CPU: 0 PID: 10368 Comm: syz-executor0 Not tainted 4.16.0+ #13 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__wrmsr arch/x86/include/asm/msr.h:105 [inline] RIP: 0010:native_write_msr+0xa/0x30 arch/x86/include/asm/msr.h:162 RSP: 0018:ffff8801db007d40 EFLAGS: 00000046 RAX: 0000000000000b2d RBX: 0000000000000838 RCX: 0000000000000838 RDX: 0000000000000000 RSI: 0000000000000b2d RDI: 0000000000000838 RBP: ffff8801db007d40 R08: ffff88021fff801c R09: ffff88021fff8008 R10: ffff88021fff801d R11: ffff88021fff8010 R12: 0000000000000b2d R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000003 FS: 00007fda78450700(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000001c702f000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: paravirt_write_msr arch/x86/include/asm/paravirt.h:117 [inline] native_apic_msr_write+0x5c/0x80 arch/x86/include/asm/apic.h:208 apic_write arch/x86/include/asm/apic.h:396 [inline] lapic_next_event+0x54/0x80 arch/x86/kernel/apic/apic.c:460 clockevents_program_event+0x248/0x2e0 kernel/time/clockevents.c:344 tick_program_event+0x7c/0x100 kernel/time/tick-oneshot.c:48 hrtimer_interrupt+0x2f9/0x6f0 kernel/time/hrtimer.c:1482 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline] smp_apic_timer_interrupt+0x14a/0x700 arch/x86/kernel/apic/apic.c:1050 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:862 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:783 [inline] RIP: 0010:console_trylock_spinning kernel/printk/printk.c:1678 [inline] RIP: 0010:vprintk_emit+0xa68/0xb90 kernel/printk/printk.c:1906 RSP: 0018:ffff88018b62e728 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff12 RAX: 0000000000040000 RBX: 1ffffffff10a2555 RCX: ffffffff815afd3f RDX: 0000000000040000 RSI: ffffc90001ea9000 RDI: 0000000000000246 RBP: ffff88018b62e8b0 R08: 1ffff100316c5cb3 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 000000000000001c R13: ffff88018b62e808 R14: ffffed00316c5d01 R15: ffffffff89daff80 vprintk_default+0x28/0x30 kernel/printk/printk.c:1947 vprintk_func+0x57/0xc0 kernel/printk/printk_safe.c:379 printk+0xaa/0xca kernel/printk/printk.c:1980 __find_get_block_slow fs/buffer.c:238 [inline] __find_get_block+0xdad/0xdf0 fs/buffer.c:1310 __getblk_slow fs/buffer.c:1055 [inline] __getblk_gfp+0x26c/0xb40 fs/buffer.c:1336 __bread_gfp+0x2d/0x2a0 fs/buffer.c:1370 sb_bread include/linux/buffer_head.h:309 [inline] fat__get_entry+0x195/0x910 fs/fat/dir.c:101 fat_get_entry fs/fat/dir.c:129 [inline] fat_search_long+0x32f/0x14b0 fs/fat/dir.c:477 vfat_find+0x134/0x180 fs/fat/namei_vfat.c:697 vfat_lookup+0xf3/0x770 fs/fat/namei_vfat.c:720 lookup_slow+0x282/0x4d0 fs/namei.c:1634 walk_component+0x89f/0x13d0 fs/namei.c:1763 link_path_walk+0xd4e/0x1470 fs/namei.c:2092 path_lookupat+0xf3/0xba0 fs/namei.c:2280 do_o_path fs/namei.c:3479 [inline] path_openat+0x1d85/0x3590 fs/namei.c:3508 do_filp_open+0x25b/0x3b0 fs/namei.c:3554 do_sys_open+0x502/0x6d0 fs/open.c:1101 SYSC_openat fs/open.c:1128 [inline] SyS_openat+0x30/0x40 fs/open.c:1122 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x4552d9 RSP: 002b:00007fda7844fc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fda784506d4 RCX: 00000000004552d9 RDX: 0000000000200002 RSI: 0000000020000040 RDI: ffffffffffffff9c RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000420 R14: 00000000006f93a0 R15: 0000000000000000 Code: 5d c3 0f 21 d0 5d c3 0f 21 d8 5d c3 0f 21 f0 5d c3 0f 0b 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 55 89 f9 89 f0 48 89 e5 0f 30 <0f> 1f 44 00 00 5d c3 48 89 d6 89 c2 48 c1 e6 20 48 09 d6 31 d2