Buffer I/O error on dev loop0, logical block 0, lost async page write SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=23576 comm=syz-executor4 Buffer I/O error on dev loop0, logical block 2, lost async page write loop_reread_partitions: partition scan of loop0 (mñs=zŠ$/Ø™àc?_Î¨ûZUØ»¤Ù Ç¡$Ø¬9Ñ=É:€ò/ùý5¨Dóèµäå“Q7¯oâQ4C]) failed (rc=-13) INFO: task syz-executor0:23514 blocked for more than 120 seconds. Not tainted 4.9.92-g13b40d3 #72 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D26192 23514 3838 0x00000004 ffff8801ce311800 0000000000000000 ffff8801cd77c540 ffff8801d9b73000 ffff8801db321b98 ffff8801b8abefa0 ffffffff838a76cb 0000000041b58ab3 ffffffff84193da8 00ffffff8123ac80 ffff8801db322468 ffff8801db322490 Call Trace: [] schedule+0x7f/0x1b0 kernel/sched/core.c:3551 [] schedule_timeout+0x56c/0x10b0 kernel/time/timer.c:1768 [] io_schedule_timeout+0x1be/0x390 kernel/sched/core.c:5173 [] io_schedule include/linux/sched.h:460 [inline] [] bit_wait_io+0x19/0xa0 kernel/sched/wait.c:582 [] __wait_on_bit_lock+0xc2/0x1c0 kernel/sched/wait.c:421 [] __lock_page+0xff/0x160 mm/filemap.c:934 [] lock_page include/linux/pagemap.h:454 [inline] [] write_cache_pages+0x833/0xec0 mm/page-writeback.c:2214 [] generic_writepages+0xda/0x150 mm/page-writeback.c:2333 [] blkdev_writepages+0x1d/0x30 fs/block_dev.c:1764 [] do_writepages+0xed/0x1c0 mm/page-writeback.c:2347 [] __filemap_fdatawrite_range+0x1b3/0x250 mm/filemap.c:390 [] filemap_write_and_wait_range+0x59/0xb0 mm/filemap.c:580 [] blkdev_fsync+0x66/0xb0 fs/block_dev.c:369 [] vfs_fsync_range+0x10a/0x250 fs/sync.c:195 [] generic_write_sync include/linux/fs.h:2590 [inline] [] blkdev_write_iter+0x2a6/0x380 fs/block_dev.c:1720 [] vfs_iter_write+0x2e0/0x450 fs/read_write.c:390 [] iter_file_splice_write+0x5b5/0xb60 fs/splice.c:768 [] do_splice_from fs/splice.c:870 [inline] [] direct_splice_actor+0x125/0x180 fs/splice.c:1037 [] splice_direct_to_actor+0x2cc/0x800 fs/splice.c:992 [] do_splice_direct+0x1a7/0x270 fs/splice.c:1080 [] do_sendfile+0x54b/0xd30 fs/read_write.c:1393 [] SYSC_sendfile64 fs/read_write.c:1448 [inline] [] SyS_sendfile64+0xd1/0x160 fs/read_write.c:1440 [] do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Showing all locks held in the system: 2 locks held by khungtaskd/515: #0: (rcu_read_lock){......}, at: [] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline] #0: (rcu_read_lock){......}, at: [] watchdog+0x125/0xa70 kernel/hung_task.c:239 #1: (tasklist_lock){.+.+..}, at: [] debug_show_all_locks+0x70/0x280 kernel/locking/lockdep.c:4336 2 locks held by getty/3750: #0: (&tty->ldisc_sem){++++++}, at: [] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+.+.}, at: [] n_tty_read+0x1f4/0x16c0 drivers/tty/n_tty.c:2133 3 locks held by kworker/u4:9/22313: #0: ("writeback"){++++.+}, at: [] work_static include/linux/workqueue.h:186 [inline] #0: ("writeback"){++++.+}, at: [] set_work_data kernel/workqueue.c:617 [inline] #0: ("writeback"){++++.+}, at: [] set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: ("writeback"){++++.+}, at: [] process_one_work+0x6f2/0x1610 kernel/workqueue.c:2085 #1: ((&(&wb->dwork)->work)){+.+.+.}, at: [] process_one_work+0x72c/0x1610 kernel/workqueue.c:2089 #2: (&type->s_umount_key#29){++++..}, at: [] trylock_super+0x20/0x100 fs/super.c:393 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 515 Comm: khungtaskd Not tainted 4.9.92-g13b40d3 #72 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801d971fd00 ffffffff81d95109 0000000000000000 0000000000000001 0000000000000001 0000000000000001 ffffffff810bb8f0 ffff8801d971fd38 ffffffff81da025d 0000000000000001 0000000000000000 ffff8801cd09cc18 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] nmi_cpu_backtrace+0xfd/0x120 lib/nmi_backtrace.c:99 [] nmi_trigger_cpumask_backtrace+0x117/0x190 lib/nmi_backtrace.c:60 [] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [] check_hung_task kernel/hung_task.c:125 [inline] [] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline] [] watchdog+0x6f0/0xa70 kernel/hung_task.c:239 [] kthread+0x26d/0x300 kernel/kthread.c:211 [] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 3651 Comm: rs:main Q:Reg Not tainted 4.9.92-g13b40d3 #72 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801c6889800 task.stack: ffff8801c4f60000 RIP: 0010:[] c [] mark_lock+0x119/0xfd0 kernel/locking/lockdep.c:3092 RSP: 0018:ffff8801c4f67208 EFLAGS: 00000086 RAX: 0000000000000001 RBX: ffff8801c688a178 RCX: 1ffff10038d11433 RDX: 1ffffffff0a76c9e RSI: ffff8801c688a178 RDI: ffffffff853b64f0 RBP: ffff8801c4f67210 R08: 1ffff10038d1142e R09: 0000000000000000 R10: 0000000000000003 R11: ffff8801c6889800 R12: 0000000000000359 R13: 0000000000000003 R14: 0000000000000005 R15: ffff8801c688a178 FS: 00007fc239109700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000a70000 CR3: 00000001b6a14000 CR4: 0000000000160670 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: 0000000000000000c ffff8801c4f673e0c ffffffff8123b8a5c ffff8801c4f673f0c 0000000000000046c ffff8801c6889800c ffff8801c688a178c 0000000000000024c 0000000000000000c 0000000000000005c 0000000000000000c ffff8801c4f67428c Call Trace: [] mark_irqflags kernel/locking/lockdep.c:2937 [inline] [] __lock_acquire+0xc25/0x3640 kernel/locking/lockdep.c:3302 [] lock_acquire+0x12e/0x410 kernel/locking/lockdep.c:3756 [] __mutex_lock_common kernel/locking/mutex.c:521 [inline] [] mutex_lock_nested+0xbb/0x870 kernel/locking/mutex.c:621 [] ext4_orphan_add+0x320/0x7d0 fs/ext4/namei.c:2761 [] ext4_truncate+0x50a/0x12e0 fs/ext4/inode.c:4252 [] ext4_truncate_failed_write fs/ext4/truncate.h:15 [inline] [] ext4_da_write_begin+0x5a3/0x1020 fs/ext4/inode.c:3015 [] generic_perform_write+0x261/0x500 mm/filemap.c:2741 [] __generic_file_write_iter+0x348/0x570 mm/filemap.c:2866 [] ext4_file_write_iter+0x99f/0xe00 fs/ext4/file.c:165 [] new_sync_write fs/read_write.c:496 [inline] [] __vfs_write+0x4bf/0x680 fs/read_write.c:509 [] vfs_write+0x189/0x530 fs/read_write.c:557 [] SYSC_write fs/read_write.c:604 [inline] [] SyS_write+0xd9/0x1b0 fs/read_write.c:596 [] do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Code: c89 cfa c48 cc1 cea c03 c80 c3c c02 c00 c0f c85 c55 c0d c00 c00 c49 c85 c5c c24 c30 c74 c7b c41 cbc c01 c00 c00 c00 c48 c83 cc4 c18 c44 c89 ce0 c5b c41 c5c c41 c5d c41 c5e c<41> c5f c5d cc3 c48 cba c00 c00 c00 c00 c00 cfc cff cdf c4c c89 cf1 c48 cc1 ce9 c03 c