device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 INFO: task syz-executor0:7707 blocked for more than 120 seconds. Not tainted 4.17.0-rc1+ #7 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D25896 7707 4579 0x00000004 Call Trace: context_switch kernel/sched/core.c:2848 [inline] __schedule+0x801/0x1e30 kernel/sched/core.c:3490 b_state=0x00000029, b_size=512 schedule+0xef/0x430 kernel/sched/core.c:3549 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 __rwsem_down_write_failed_common+0x919/0x15d0 kernel/locking/rwsem-xadd.c:566 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:595 b_state=0x00000029, b_size=512 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write_nested+0xa6/0x120 kernel/locking/rwsem.c:193 device loop0 blocksize: 4096 inode_lock_nested include/linux/fs.h:748 [inline] filename_create+0x1aa/0x5a0 fs/namei.c:3606 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 user_path_create fs/namei.c:3664 [inline] do_mkdirat+0xd2/0x2f0 fs/namei.c:3802 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __do_sys_mkdir fs/namei.c:3826 [inline] __se_sys_mkdir fs/namei.c:3824 [inline] __x64_sys_mkdir+0x5c/0x80 fs/namei.c:3824 __find_get_block_slow() failed. block=1, b_blocknr=8 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455329 __find_get_block_slow() failed. block=1, b_blocknr=8 RSP: 002b:00007fa047b6ac68 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007fa047b6b6d4 RCX: 0000000000455329 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000080 RBP: 000000000072bf58 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff __find_get_block_slow() failed. block=1, b_blocknr=8 R13: 00000000000003eb R14: 00000000006f8ea8 R15: 0000000000000001 Showing all locks held in the system: b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 2 locks held by khungtaskd/889: __find_get_block_slow() failed. block=1, b_blocknr=8 #0: 000000005a755549 ( b_state=0x00000029, b_size=512 rcu_read_lock){....}, at: check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] rcu_read_lock){....}, at: watchdog+0x1ff/0xf60 kernel/hung_task.c:249 #1: device loop0 blocksize: 4096 000000001826b538 (tasklist_lock){.+.+} __find_get_block_slow() failed. block=1, b_blocknr=8 , at: debug_show_all_locks+0xde/0x34a kernel/locking/lockdep.c:4470 1 lock held by rsyslogd/4410: b_state=0x00000029, b_size=512 #0: 00000000098dc5c3 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1a9/0x1e0 fs/file.c:766 2 locks held by getty/4500: device loop0 blocksize: 4096 #0: 000000009e1b82ce (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000009677209b __find_get_block_slow() failed. block=1, b_blocknr=8 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4501: b_state=0x00000029, b_size=512 #0: 0000000051d303ef (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: device loop0 blocksize: 4096 00000000de1d16c3 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4502: #0: 00000000e037a2c4 ( __find_get_block_slow() failed. block=1, b_blocknr=8 &tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: b_state=0x00000029, b_size=512 00000000c85664e1 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4503: device loop0 blocksize: 4096 #0: 000000004cd6d5cb (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 __find_get_block_slow() failed. block=1, b_blocknr=8 #1: 000000003dbbcec3 (&ldata->atomic_read_lock b_state=0x00000029, b_size=512 ){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4504: device loop0 blocksize: 4096 #0: 000000001304a854 ( __find_get_block_slow() failed. block=1, b_blocknr=8 &tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: b_state=0x00000029, b_size=512 0000000074a8f5c8 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4505: device loop0 blocksize: 4096 #0: 0000000046b231bd (&tty->ldisc_sem __find_get_block_slow() failed. block=1, b_blocknr=8 ){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: b_state=0x00000029, b_size=512 000000008ad96e3a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4506: device loop0 blocksize: 4096 #0: 00000000e9641bc4 (&tty->ldisc_sem __find_get_block_slow() failed. block=1, b_blocknr=8 ){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: b_state=0x00000029, b_size=512 00000000118ea9b8 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by syz-executor0/7707: device loop0 blocksize: 4096 #0: 00000000a54a2243 (sb_writers __find_get_block_slow() failed. block=1, b_blocknr=8 #16){.+.+}, at: sb_start_write include/linux/fs.h:1550 [inline] #16){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386 #1: b_state=0x00000029, b_size=512 0000000031db7a55 (&sb->s_type->i_mutex_key#19/1){+.+.}, at: inode_lock_nested include/linux/fs.h:748 [inline] 0000000031db7a55 (&sb->s_type->i_mutex_key#19/1){+.+.}, at: filename_create+0x1aa/0x5a0 fs/namei.c:3606 device loop0 blocksize: 4096 2 locks held by syz-executor0/7710: #0: 00000000a54a2243 __find_get_block_slow() failed. block=1, b_blocknr=8 (sb_writers#16){.+.+}, at: sb_start_write include/linux/fs.h:1550 [inline] (sb_writers#16){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386 b_state=0x00000029, b_size=512 #1: 0000000031db7a55 (&sb->s_type->i_mutex_key#19){+.+.}, at: inode_lock include/linux/fs.h:713 [inline] #1: 0000000031db7a55 (&sb->s_type->i_mutex_key#19){+.+.}, at: do_last fs/namei.c:3274 [inline] #1: 0000000031db7a55 (&sb->s_type->i_mutex_key#19){+.+.}, at: path_openat+0x123b/0x4e20 fs/namei.c:3501 ============================================= NMI backtrace for cpu 1 device loop0 blocksize: 4096 CPU: 1 PID: 889 Comm: khungtaskd Not tainted 4.17.0-rc1+ #7 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 __find_get_block_slow() failed. block=1, b_blocknr=8 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1b9/0x294 lib/dump_stack.c:113 nmi_cpu_backtrace.cold.4+0x19/0xce lib/nmi_backtrace.c:103 b_state=0x00000029, b_size=512 nmi_trigger_cpumask_backtrace+0x151/0x192 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+0xc10/0xf60 kernel/hung_task.c:249 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 kthread+0x345/0x410 kernel/kthread.c:238 device loop0 blocksize: 4096 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 Sending NMI from CPU 1 to CPUs 0: __find_get_block_slow() failed. block=1, b_blocknr=8 NMI backtrace for cpu 0 CPU: 0 PID: 7628 Comm: syz-executor0 Not tainted 4.17.0-rc1+ #7 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:ffff8801db007d48 EFLAGS: 00000046 RAX: 000000000000e3c2 RBX: 0000000000000838 RCX: 0000000000000838 RDX: 0000000000000000 RSI: 000000000000e3c2 RDI: 0000000000000838 RBP: ffff8801db007d48 R08: ffff88018b5f85c0 R09: 0000000000000000 R10: ffffed0043fff001 R11: ffff88021fff8017 R12: 000000000000e3c2 R13: 0000000000000000 R14: 0000000000000000 R15: ffff8801db025c00 FS: 00007fa047b8c700(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6db4c6f000 CR3: 000000018c60d000 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+0x5b/0x80 arch/x86/include/asm/apic.h:208 apic_write arch/x86/include/asm/apic.h:396 [inline] lapic_next_event+0x5a/0x90 arch/x86/kernel/apic/apic.c:460 clockevents_program_event+0x251/0x370 kernel/time/clockevents.c:344 tick_program_event+0xab/0x130 kernel/time/tick-oneshot.c:48 hrtimer_interrupt+0x2db/0x650 kernel/time/hrtimer.c:1519 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline] smp_apic_timer_interrupt+0x15d/0x710 arch/x86/kernel/apic/apic.c:1050 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:863 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+0xbd0/0xdd0 kernel/printk/printk.c:1906 RSP: 0018:ffff88018b566ca8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000040000 RBX: 0000000000000200 RCX: ffffc90001ed0000 RDX: 0000000000040000 RSI: ffffffff8160bbb7 RDI: 0000000000000246 RBP: ffff88018b566e38 R08: ffff88018b5f8df8 R09: 0000000000000006 R10: ffff88018b5f85c0 R11: 0000000000000000 R12: 1ffffffff116312d R13: 0000000000000034 R14: ffffed00316acdb2 R15: ffffffff8a49a360 vprintk_default+0x28/0x30 kernel/printk/printk.c:1947 vprintk_func+0x7a/0xe7 kernel/printk/printk_safe.c:379 printk+0x9e/0xba kernel/printk/printk.c:1980 __find_get_block_slow fs/buffer.c:231 [inline] __find_get_block.cold.58+0x3a/0x103 fs/buffer.c:1287 __getblk_slow fs/buffer.c:1032 [inline] __getblk_gfp+0x2a1/0xaf0 fs/buffer.c:1313 __bread_gfp+0x2d/0x310 fs/buffer.c:1347 sb_bread include/linux/buffer_head.h:309 [inline] fat__get_entry+0x594/0xa20 fs/fat/dir.c:101 fat_get_entry fs/fat/dir.c:129 [inline] fat_get_short_entry+0x13c/0x2c0 fs/fat/dir.c:876 fat_scan+0x111/0x340 fs/fat/dir.c:961 msdos_find+0x10e/0x320 fs/fat/namei_msdos.c:129 msdos_lookup+0x134/0x300 fs/fat/namei_msdos.c:209 lookup_open+0x71d/0x1b40 fs/namei.c:3165 do_last fs/namei.c:3277 [inline] path_openat+0x1268/0x4e20 fs/namei.c:3501 do_filp_open+0x249/0x350 fs/namei.c:3535 do_sys_open+0x56f/0x740 fs/open.c:1093 __do_sys_open fs/open.c:1111 [inline] __se_sys_open fs/open.c:1106 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1106 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455329 RSP: 002b:00007fa047b8bc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007fa047b8c6d4 RCX: 0000000000455329 RDX: 0000000000000000 RSI: 0800000000002040 RDI: 0000000020000300 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000415 R14: 00000000006f9298 R15: 0000000000000000 Code: c0 5d c3 0f 21 c8 5d c3 0f 21 d0 5d c3 0f 21 d8 5d c3 0f 21 f0 5d c3 0f 0b 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 c1 e2 20 89 f6 48 09 d6 31 d2 e8 6f d2 INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.147 msecs