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=2, b_blocknr=16 INFO: task syz-executor0:7114 blocked for more than 140 seconds. b_state=0x00000029, b_size=512 Not tainted 4.18.0-next-20180824+ #47 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D23736 7114 4501 0x00000004 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 Call Trace: context_switch kernel/sched/core.c:2825 [inline] __schedule+0x87c/0x1df0 kernel/sched/core.c:3473 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 schedule+0xfb/0x450 kernel/sched/core.c:3517 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 __rwsem_down_write_failed_common+0x98b/0x1650 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=2, b_blocknr=16 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=2, b_blocknr=16 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=2, b_blocknr=16 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+0xaa/0x130 kernel/locking/rwsem.c:72 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 inode_lock include/linux/fs.h:765 [inline] utimes_common.isra.1+0x45c/0x8e0 fs/utimes.c:90 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=2, b_blocknr=16 b_state=0x00000029, b_size=512 do_utimes+0x1f7/0x380 fs/utimes.c:156 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __do_sys_utime fs/utimes.c:35 [inline] __se_sys_utime fs/utimes.c:24 [inline] __x64_sys_utime+0x1df/0x290 fs/utimes.c:24 __find_get_block_slow() failed. block=1, b_blocknr=8 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 entry_SYSCALL_64_after_hwframe+0x49/0xbe b_state=0x00000029, b_size=512 RIP: 0033:0x457089 Code: Bad RIP value. device loop0 blocksize: 4096 RSP: 002b:00007f0566d71c78 EFLAGS: 00000246 __find_get_block_slow() failed. block=2, b_blocknr=16 ORIG_RAX: 0000000000000084 RAX: ffffffffffffffda RBX: 00007f0566d726d4 RCX: 0000000000457089 b_state=0x00000029, b_size=512 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 00000000200000c0 RBP: 0000000000930140 R08: 0000000000000000 R09: 0000000000000000 device loop0 blocksize: 4096 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d6d10 R14: 00000000004ca115 R15: 0000000000000001 __find_get_block_slow() failed. block=1, b_blocknr=8 Showing all locks held in the system: 6 locks held by kworker/u4:2/64: 1 lock held by khungtaskd/775: #0: 000000001f91e153 b_state=0x00000029, b_size=512 (rcu_read_lock){....} device loop0 blocksize: 4096 , at: debug_show_all_locks+0xd0/0x428 kernel/locking/lockdep.c:4436 1 lock held by rsyslogd/4365: __find_get_block_slow() failed. block=2, b_blocknr=16 #0: b_state=0x00000029, b_size=512 0000000053bf1abb (&f->f_pos_lock device loop0 blocksize: 4096 ){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766 __find_get_block_slow() failed. block=1, b_blocknr=8 2 locks held by getty/4455: #0: b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 0000000076ac342b (&tty->ldisc_sem __find_get_block_slow() failed. block=1, b_blocknr=8 ){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 000000001f6b72e4 (&ldata->atomic_read_lock __find_get_block_slow() failed. block=2, b_blocknr=16 ){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 2 locks held by getty/4456: #0: b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 000000006854776f (&tty->ldisc_sem __find_get_block_slow() failed. block=2, b_blocknr=16 ){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 00000000c10e3e97 (&ldata->atomic_read_lock __find_get_block_slow() failed. block=1, b_blocknr=8 ){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 2 locks held by getty/4457: #0: __find_get_block_slow() failed. block=2, b_blocknr=16 000000007895f027 (&tty->ldisc_sem b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 ){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: __find_get_block_slow() failed. block=2, b_blocknr=16 00000000f41b2de7 ( b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 &ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 __find_get_block_slow() failed. block=1, b_blocknr=8 2 locks held by getty/4458: #0: b_state=0x00000029, b_size=512 00000000e0d62bc3 ( device loop0 blocksize: 4096 &tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 __find_get_block_slow() failed. block=2, b_blocknr=16 #1: 00000000bb8fb387 ( b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 &ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 __find_get_block_slow() failed. block=1, b_blocknr=8 2 locks held by getty/4459: #0: b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 00000000fb067cdc ( __find_get_block_slow() failed. block=2, b_blocknr=16 &tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 #1: 000000004486b6f7 ( __find_get_block_slow() failed. block=1, b_blocknr=8 &ldata->atomic_read_lock){+.+.} b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 , at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4460: __find_get_block_slow() failed. block=2, b_blocknr=16 #0: 00000000d305e7e0 (&tty->ldisc_sem){++++} b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 , at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: __find_get_block_slow() failed. block=1, b_blocknr=8 00000000682b1dae (&ldata->atomic_read_lock b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 ){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4461: #0: 000000008d045b65 (&tty->ldisc_sem){++++} __find_get_block_slow() failed. block=2, b_blocknr=16 , at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=2, b_blocknr=16 00000000650c10f8 (&ldata->atomic_read_lock b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 ){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 7 locks held by syz-executor0/7100: __find_get_block_slow() failed. block=1, b_blocknr=8 2 locks held by syz-executor0/7114: #0: b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 000000005be1b305 (sb_writers#15 __find_get_block_slow() failed. block=2, b_blocknr=16 ){.+.+}, at: sb_start_write include/linux/fs.h:1598 [inline] ){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360 #1: b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 __find_get_block_slow() failed. block=1, b_blocknr=8 00000000d0964a11 ( b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 &sb->s_type->i_mutex_key#19){++++} __find_get_block_slow() failed. block=2, b_blocknr=16 , at: inode_lock include/linux/fs.h:765 [inline] , at: utimes_common.isra.1+0x45c/0x8e0 fs/utimes.c:90 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 775 Comm: khungtaskd Not tainted 4.18.0-next-20180824+ #47 __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+0x1c9/0x2b4 lib/dump_stack.c:113 b_state=0x00000029, b_size=512 nmi_cpu_backtrace.cold.3+0x48/0x88 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x151/0x192 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:144 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:204 [inline] watchdog+0xb39/0x1040 kernel/hung_task.c:265 __find_get_block_slow() failed. block=2, b_blocknr=16 b_state=0x00000029, b_size=512 device loop0 blocksize: 4096 kthread+0x35a/0x420 kernel/kthread.c:246 __find_get_block_slow() failed. block=2, b_blocknr=16 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: b_state=0x00000029, b_size=512 INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 2.051 msecs NMI backtrace for cpu 1 CPU: 1 PID: 7100 Comm: syz-executor0 Not tainted 4.18.0-next-20180824+ #47 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__read_once_size include/linux/compiler.h:188 [inline] RIP: 0010:trace_softirq_entry include/trace/events/irq.h:128 [inline] RIP: 0010:__do_softirq+0x3e9/0xa74 kernel/softirq.c:291 Code: c7 c6 20 b4 8b 88 89 c0 48 0f a3 06 0f 83 fd fe ff ff 65 ff 05 f8 e9 21 79 48 8b b5 48 fe ff ff c6 06 00 48 8b 05 3f 00 a7 01 <48> 89 45 98 c6 06 f8 e8 fb 63 86 fa 85 c0 74 0d 80 3d 8c b5 a6 01 RSP: 0018:ffff8801db107c98 EFLAGS: 00000207 RAX: 0000000000000000 RBX: ffffffff87e09108 RCX: 1ffff100374b75fb RDX: 0000000000000000 RSI: ffffed003b620fc1 RDI: ffff8801ba5baf3c RBP: ffff8801db107e70 R08: ffff8801ba5baf40 R09: 0000000000000002 R10: ffff8801ba5ba700 R11: 0000000000000000 R12: 0000000000000001 R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000001 FS: 00007f0566d93700(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000001b0997000 CR4: 00000000001406e0 Call Trace: invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x1d6/0x210 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x18e/0x6a0 arch/x86/kernel/apic/apic.c:1056 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:867 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:783 [inline] RIP: 0010:console_trylock_spinning kernel/printk/printk.c:1686 [inline] RIP: 0010:vprintk_emit+0x7f9/0x910 kernel/printk/printk.c:1926 Code: 00 00 00 00 fc ff df 41 80 3c 04 00 0f 85 d3 00 00 00 48 83 3d cf 33 8e 06 00 74 2d e8 30 45 19 00 48 8b bd 90 fe ff ff 57 9d <0f> 1f 44 00 00 e9 68 fe ff ff e8 18 45 19 00 0f 0b e8 11 45 19 00 RSP: 0018:ffff880189d3e5d8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000040000 RBX: 1ffff100313a7cc1 RCX: ffffc90001e1c000 RDX: 0000000000040000 RSI: ffffffff816388a0 RDI: 0000000000000246 RBP: ffff880189d3e750 R08: ffff8801ba5baf40 R09: 0000000000000006 R10: ffff8801ba5ba700 R11: 0000000000000000 R12: 1ffffffff0fe378d R13: 0000000000000200 R14: ffff880189d3e728 R15: 0000000000000000 vprintk_default+0x28/0x30 kernel/printk/printk.c:1968 vprintk_func+0x7a/0x117 kernel/printk/printk_safe.c:398 printk+0xa7/0xcf kernel/printk/printk.c:2001 __find_get_block_slow fs/buffer.c:236 [inline] __find_get_block.cold.61+0x85/0xff fs/buffer.c:1326 __getblk_slow fs/buffer.c:1059 [inline] __getblk_gfp+0x3dc/0xe00 fs/buffer.c:1352 __bread_gfp+0x2d/0x310 fs/buffer.c:1386 sb_bread include/linux/buffer_head.h:307 [inline] fat_ent_bread+0x173/0x290 fs/fat/fatent.c:107 fat_ent_read_block fs/fat/fatent.c:442 [inline] fat_alloc_clusters+0x8ce/0x16e0 fs/fat/fatent.c:490 fat_add_cluster+0x7a/0x150 fs/fat/inode.c:101 __fat_get_block fs/fat/inode.c:148 [inline] fat_get_block+0x373/0xaf0 fs/fat/inode.c:183 __block_write_begin_int+0x50d/0x1b70 fs/buffer.c:1998 __block_write_begin fs/buffer.c:2048 [inline] block_write_begin+0xda/0x370 fs/buffer.c:2107 cont_write_begin+0x567/0x860 fs/buffer.c:2460 fat_write_begin+0x8d/0x120 fs/fat/inode.c:229 pagecache_write_begin+0x88/0xc0 mm/filemap.c:2879 cont_expand_zero fs/buffer.c:2387 [inline] cont_write_begin+0x22b/0x860 fs/buffer.c:2450 fat_write_begin+0x8d/0x120 fs/fat/inode.c:229 pagecache_write_begin+0x88/0xc0 mm/filemap.c:2879 generic_cont_expand_simple+0x134/0x1f0 fs/buffer.c:2351 fat_cont_expand+0x71/0x2b0 fs/fat/file.c:226 fat_setattr+0xa37/0xc90 fs/fat/file.c:505 notify_change+0xc0c/0x10f0 fs/attr.c:334 do_truncate+0x1ac/0x2b0 fs/open.c:63 vfs_truncate+0x60e/0x840 fs/open.c:109 do_sys_truncate+0x156/0x190 fs/open.c:132 __do_sys_truncate fs/open.c:144 [inline] __se_sys_truncate fs/open.c:142 [inline] __x64_sys_truncate+0x54/0x80 fs/open.c:142 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457089 Code: fd b4 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 b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f0566d92c78 EFLAGS: 00000246 ORIG_RAX: 000000000000004c RAX: ffffffffffffffda RBX: 00007f0566d936d4 RCX: 0000000000457089 RDX: 0000000000000000 RSI: 0000000000100007 RDI: 0000000020000280 RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d6c38 R14: 00000000004c347c R15: 0000000000000000