__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 INFO: task syz-executor0:20276 blocked for more than 120 seconds. device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 Not tainted 4.17.0-rc1+ #6 b_state=0x00000029, b_size=512 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D24704 20276 23010 0x00000004 device loop0 blocksize: 4096 Call Trace: context_switch kernel/sched/core.c:2848 [inline] __schedule+0x801/0x1e30 kernel/sched/core.c:3490 __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 schedule+0xef/0x430 kernel/sched/core.c:3549 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_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 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 rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:595 device loop0 blocksize: 4096 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __find_get_block_slow() failed. block=1, b_blocknr=8 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0xa2/0x120 kernel/locking/rwsem.c:72 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 inode_lock include/linux/fs.h:713 [inline] lock_mount+0x8c/0x2e0 fs/namespace.c:2087 device loop0 blocksize: 4096 do_add_mount+0x27/0x370 fs/namespace.c:2464 __find_get_block_slow() failed. block=1, b_blocknr=8 do_new_mount fs/namespace.c:2531 [inline] do_mount+0x18e6/0x3070 fs/namespace.c:2847 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 ksys_mount+0x12d/0x140 fs/namespace.c:3063 __do_sys_mount fs/namespace.c:3077 [inline] __se_sys_mount fs/namespace.c:3074 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3074 b_state=0x00000029, b_size=512 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455329 device loop0 blocksize: 4096 RSP: 002b:00007f68cf133c68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f68cf1346d4 RCX: 0000000000455329 __find_get_block_slow() failed. block=1, b_blocknr=8 RDX: 0000000020000240 RSI: 0000000020000080 RDI: 0000000020000280 RBP: 000000000072bf58 R08: 0000000020000040 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff b_state=0x00000029, b_size=512 R13: 00000000000003fb R14: 00000000006f9028 R15: 0000000000000001 Showing all locks held in the system: device loop0 blocksize: 4096 2 locks held by khungtaskd/888: __find_get_block_slow() failed. block=1, b_blocknr=8 #0: 00000000a9a44477 ( 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 device loop0 blocksize: 4096 #1: 000000009ff2053f (tasklist_lock){.+.+}, at: debug_show_all_locks+0xde/0x34a kernel/locking/lockdep.c:4470 2 locks held by getty/4439: __find_get_block_slow() failed. block=1, b_blocknr=8 #0: 00000000c9b76b9a (&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=1, b_blocknr=8 #1: b_state=0x00000029, b_size=512 000000000e5cb710 (&ldata->atomic_read_lock){+.+.} device loop0 blocksize: 4096 , at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4440: __find_get_block_slow() failed. block=1, b_blocknr=8 #0: 000000005b768cd3 (&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 #1: 00000000addaef00 ( __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/4441: #0: 000000000c8a520e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000be9918f7 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4442: #0: 0000000029e321e8 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000c3a0104f (&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/4443: device loop0 blocksize: 4096 #0: 00000000b12d6ffd ( __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 00000000625407e7 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4444: device loop0 blocksize: 4096 #0: 0000000019948f4c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: __find_get_block_slow() failed. block=1, b_blocknr=8 00000000071c1ff8 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4445: b_state=0x00000029, b_size=512 #0: 00000000fe9e0006 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 device loop0 blocksize: 4096 #1: 00000000a738c9c9 ( __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 1 lock held by syz-executor0/20276: b_state=0x00000029, b_size=512 #0: 00000000a1afb949 (&sb->s_type->i_mutex_key#16){++++} device loop0 blocksize: 4096 , at: inode_lock include/linux/fs.h:713 [inline] , at: lock_mount+0x8c/0x2e0 fs/namespace.c:2087 2 locks held by syz-executor0/20277: __find_get_block_slow() failed. block=1, b_blocknr=8 #0: 000000008134fa51 (sb_writers#14){.+.+}, at: sb_start_write include/linux/fs.h:1550 [inline] #0: 000000008134fa51 (sb_writers#14){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386 #1: 00000000a1afb949 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 (&sb->s_type->i_mutex_key#16/1 __find_get_block_slow() failed. block=1, b_blocknr=8 ){+.+.}, at: inode_lock_nested include/linux/fs.h:748 [inline] ){+.+.}, at: filename_create+0x1aa/0x5a0 fs/namei.c:3606 1 lock held by syz-executor0/20279: #0: b_state=0x00000029, b_size=512 00000000a1afb949 (&sb->s_type->i_mutex_key#16){++++}, at: inode_lock include/linux/fs.h:713 [inline] 00000000a1afb949 (&sb->s_type->i_mutex_key#16){++++}, at: lock_mount+0x8c/0x2e0 fs/namespace.c:2087 device loop0 blocksize: 4096 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 888 Comm: khungtaskd Not tainted 4.17.0-rc1+ #6 __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: __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 kthread+0x345/0x410 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 Sending NMI from CPU 0 to CPUs 1: b_state=0x00000029, b_size=512 NMI backtrace for cpu 1 CPU: 1 PID: 20216 Comm: syz-executor0 Not tainted 4.17.0-rc1+ #6 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x1/0x20 kernel/kcov.c:187 RSP: 0018:ffff8801db107d88 EFLAGS: 00000006 RAX: ffff8801d11bc6c0 RBX: ffff8801db11f0c0 RCX: ffffffff816b3515 RDX: 0000000000010000 RSI: 0000000000000003 RDI: 0000000000000003 RBP: ffff8801db107dc0 R08: ffff8801d11bc6c0 R09: ffffed003b624b80 R10: ffffed003b624b80 R11: ffff8801db125c03 R12: 000000ac0c601b80 R13: 0000000000000000 R14: 0000000000000003 R15: ffff8801db125c00 FS: 00007f68cf155700(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000001d8a72000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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:ffff88018a2df000 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000040000 RBX: 0000000000000200 RCX: ffffc90003ac6000 RDX: 0000000000040000 RSI: ffffffff8160bbb7 RDI: 0000000000000246 RBP: ffff88018a2df190 R08: ffff8801d11bcef8 R09: 0000000000000006 R10: ffff8801d11bc6c0 R11: 0000000000000000 R12: 1ffffffff116312d R13: 000000000000001e R14: ffffed003145be1d 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:235 [inline] __find_get_block.cold.58+0x85/0x103 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_search_long+0x33b/0x15d0 fs/fat/dir.c:477 vfat_find+0x16d/0x1a0 fs/fat/namei_vfat.c:697 vfat_lookup+0xfc/0x6d0 fs/fat/namei_vfat.c:720 __lookup_hash+0x12e/0x190 fs/namei.c:1505 filename_create+0x1dd/0x5a0 fs/namei.c:3607 user_path_create fs/namei.c:3664 [inline] do_mkdirat+0xd2/0x2f0 fs/namei.c:3802 __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 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455329 RSP: 002b:00007f68cf154c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007f68cf1556d4 RCX: 0000000000455329 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000080 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000003eb R14: 00000000006f8ea8 R15: 0000000000000000 Code: a6 fe ff ff 5d c3 0f 1f 40 00 55 0f b7 d6 0f b7 f7 bf 03 00 00 00 48 89 e5 48 8b 4d 08 e8 88 fe ff ff 5d c3 66 0f 1f 44 00 00 55 <89> f2 89 fe bf 05 00 00 00 48 89 e5 48 8b 4d 08 e8 6a fe ff ff INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.012 msecs