syz-executor0(8114): getblk(): executed=9 bh_count=0 bh_state=0 syz-executor0(8114): getblk(): executed=9 bh_count=0 bh_state=0 syz-executor0(8114): getblk(): executed=9 bh_count=0 bh_state=0 syz-executor0(8114): getblk(): executed=9 bh_count=0 bh_state=0 syz-executor0(8114): getblk(): executed=9 bh_count=0 bh_state=0 INFO: task syz-executor3:21112 blocked for more than 140 seconds. Not tainted 4.19.0-rc7-next-20181008+ #89 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor3 D25208 21112 6112 0x00000004 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x8cf/0x21d0 kernel/sched/core.c:3480 schedule+0xfe/0x460 kernel/sched/core.c:3524 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:280 [inline] rwsem_down_read_failed+0x371/0x710 kernel/locking/rwsem-xadd.c:297 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x9b/0x120 kernel/locking/rwsem.c:26 __get_super.part.11+0x207/0x2e0 fs/super.c:789 __get_super include/linux/spinlock.h:329 [inline] get_super+0x2d/0x50 fs/super.c:818 fsync_bdev+0x17/0xc0 fs/block_dev.c:469 blkdev_flushbuf block/ioctl.c:436 [inline] blkdev_ioctl+0x10bb/0x2010 block/ioctl.c:521 block_ioctl+0xee/0x130 fs/block_dev.c:1883 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702 __do_sys_ioctl fs/ioctl.c:709 [inline] __se_sys_ioctl fs/ioctl.c:707 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457579 Code: Bad RIP value. RSP: 002b:00007f596606dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000457579 RDX: 0000000000000000 RSI: 0000000000001261 RDI: 0000000000000003 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f596606e6d4 R13: 00000000004c043c R14: 00000000004d05d0 R15: 00000000ffffffff INFO: lockdep is turned off. NMI backtrace for cpu 1 CPU: 1 PID: 980 Comm: khungtaskd Not tainted 4.19.0-rc7-next-20181008+ #89 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+0x244/0x3ab lib/dump_stack.c:113 nmi_cpu_backtrace.cold.2+0x5c/0xa1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1e8/0x22a 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:144 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:204 [inline] watchdog+0xb39/0x1050 kernel/hung_task.c:265 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.506 msecs NMI backtrace for cpu 0 CPU: 0 PID: 8114 Comm: syz-executor0 Not tainted 4.19.0-rc7-next-20181008+ #89 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:trace_lock_release include/trace/events/lock.h:58 [inline] RIP: 0010:lock_release+0x68d/0xa10 kernel/locking/lockdep.c:3858 Code: 59 30 a1 7e 49 8d 45 c0 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 48 01 d0 c6 00 00 48 8b 15 32 a8 8e 08 49 89 55 c0 c6 00 f8 3e dd 06 00 85 c0 74 0d 80 3d 06 54 8e 08 00 0f 84 10 02 00 00 RSP: 0018:ffff88018078da48 EFLAGS: 00000082 RAX: ffffed00300f1b62 RBX: 1ffff100300f1b4e RCX: 1ffff100300f1b5a RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff880180bb8a7c RBP: ffff88018078db78 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: ffffea0006aa5af7 R12: ffff880180bb8200 R13: ffff88018078db50 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007fcbcec41700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000001d58b9000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_lock_release include/linux/rcupdate.h:228 [inline] rcu_read_unlock include/linux/rcupdate.h:661 [inline] find_get_entry+0xaae/0x1120 mm/filemap.c:1445 pagecache_get_page+0x12f/0xf00 mm/filemap.c:1518 find_get_page_flags include/linux/pagemap.h:278 [inline] __find_get_block_slow fs/buffer.c:205 [inline] __find_get_block+0x635/0xf10 fs/buffer.c:1325 __getblk_slow fs/buffer.c:1058 [inline] __getblk_gfp+0x3d3/0x1030 fs/buffer.c:1351 __bread_gfp+0x2d/0x310 fs/buffer.c:1385 sb_bread include/linux/buffer_head.h:307 [inline] fat12_ent_bread+0x14e/0x3d0 fs/fat/fatent.c:76 fat_ent_read+0x646/0xc10 fs/fat/fatent.c:368 fat_free_clusters+0x31c/0xe80 fs/fat/fatent.c:565 fat_free fs/fat/file.c:379 [inline] fat_truncate_blocks+0x9dd/0x1190 fs/fat/file.c:397 fat_free_eofblocks fs/fat/inode.c:626 [inline] fat_evict_inode+0x1d7/0x270 fs/fat/inode.c:651 evict+0x4b9/0x980 fs/inode.c:558 dispose_list+0x252/0x410 fs/inode.c:593 evict_inodes+0x4aa/0x610 fs/inode.c:643 generic_shutdown_super+0x120/0x530 fs/super.c:447 kill_block_super+0x9e/0x100 fs/super.c:1383 deactivate_locked_super+0x97/0x100 fs/super.c:328 deactivate_super+0x2bb/0x320 fs/super.c:359 cleanup_mnt+0xbf/0x160 fs/namespace.c:1049 __cleanup_mnt+0x16/0x20 fs/namespace.c:1056 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x1ad2/0x2610 kernel/exit.c:867 do_group_exit+0x177/0x440 kernel/exit.c:970 get_signal+0x8a8/0x1970 kernel/signal.c:2517 do_signal+0x9c/0x21c0 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x2e5/0x380 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457579 Code: 24 08 48 89 01 e8 d7 2d fc ff e8 22 7a fc ff b8 02 00 00 00 48 8d 0d 6a 60 09 01 87 01 8b 05 62 60 09 01 83 f8 01 0f 85 8a 00 <00> 00 b8 01 00 00 00 88 05 9e 65 09 01 84 c0 74 72 b8 01 00 00 00 RSP: 002b:00007fcbcec40cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000072bf08 RCX: 0000000000457579 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000072bf08 RBP: 000000000072bf00 R08: 0000000000000000 R0 Lost 2 message(s)!