netlink: 'syz-executor.4': attribute type 11 has an invalid length. nbd5: unable to read partition table netlink: 'syz-executor.4': attribute type 11 has an invalid length. block nbd5: shutting down sockets INFO: task syz-executor.1:26298 blocked for more than 140 seconds. Not tainted 4.19.79 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28136 26298 7569 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x866/0x1dc0 kernel/sched/core.c:3515 schedule+0x92/0x1c0 kernel/sched/core.c:3559 schedule_timeout+0x8c8/0xfc0 kernel/time/timer.c:1782 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x29c/0x440 kernel/sched/completion.c:136 flush_workqueue+0x40f/0x14b0 kernel/workqueue.c:2707 nbd_start_device_ioctl drivers/block/nbd.c:1223 [inline] __nbd_ioctl drivers/block/nbd.c:1294 [inline] nbd_ioctl+0xb52/0xcb0 drivers/block/nbd.c:1334 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0xc38/0x1ab6 block/ioctl.c:601 block_ioctl+0xee/0x130 fs/block_dev.c:1891 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xd5f/0x1380 fs/ioctl.c:688 ksys_ioctl+0xab/0xd0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:710 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459a59 Code: 70 c0 00 48 83 fb 10 7c 6e 49 c7 c4 00 00 00 00 48 89 f7 48 83 fb 20 0f 87 c8 00 00 00 48 8d 44 1e f0 eb 17 f3 0f 6f 0f 66 0f <74> c8 66 0f d7 d1 f3 0f b8 d2 49 01 d4 48 83 c7 10 48 39 c7 76 e4 RSP: 002b:00007f284c295c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000459a59 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000005 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f284c2966d4 R13: 00000000004c3381 R14: 00000000004d6f90 R15: 00000000ffffffff Showing all locks held in the system: 2 locks held by kworker/u4:0/7: 1 lock held by khungtaskd/1038: #0: 000000007c1cfe26 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:4438 3 locks held by rs:main Q:Reg/7397: 1 lock held by rsyslogd/7400: #0: 00000000678f51fa (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:767 2 locks held by getty/7521: #0: 000000003a369312 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 0000000051b654b4 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7522: #0: 0000000057548937 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 000000006616d24b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7523: #0: 00000000c646e760 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000063a452f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7524: #0: 00000000f981117f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000d2d9e3bc (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7525: #0: 00000000d7b92136 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000ee37e879 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7526: #0: 00000000090f44fd (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000d533bfd3 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7527: #0: 000000008fd6766b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 0000000049544a32 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by kworker/u5:2/10205: #0: 00000000ea55b734 ((wq_completion)"knbd%d-recv"nbd->index){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 00000000ea55b734 ((wq_completion)"knbd%d-recv"nbd->index){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 00000000ea55b734 ((wq_completion)"knbd%d-recv"nbd->index){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 00000000ea55b734 ((wq_completion)"knbd%d-recv"nbd->index){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 00000000ea55b734 ((wq_completion)"knbd%d-recv"nbd->index){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 00000000ea55b734 ((wq_completion)"knbd%d-recv"nbd->index){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 00000000ea55b734 ((wq_completion)"knbd%d-recv"nbd->index){+.+.}, at: process_one_work+0x87e/0x1750 kernel/workqueue.c:2124 #1: 00000000af3db3a7 ((work_completion)(&args->work)){+.+.}, at: process_one_work+0x8b4/0x1750 kernel/workqueue.c:2128 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1038 Comm: khungtaskd Not tainted 4.19.79 #0 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+0x172/0x1f0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b0/0x1f8 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:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x9df/0xee0 kernel/hung_task.c:287 kthread+0x354/0x420 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 7397 Comm: rs:main Q:Reg Not tainted 4.19.79 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:blk_bio_segment_split block/blk-merge.c:151 [inline] RIP: 0010:blk_queue_split+0xc32/0x1bd0 block/blk-merge.c:201 Code: 28 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 ba 0d 00 00 48 8b 84 24 90 00 00 00 44 8b 74 24 7c 0f b7 98 2e 07 00 00 44 89 f6 <89> df e8 b7 ab 58 fe 44 39 f3 0f 84 40 f9 ff ff e8 a9 aa 58 fe 44 RSP: 0018:ffff88809851f328 EFLAGS: 00000246 RAX: ffff8880a381b080 RBX: 0000000000000040 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: ffff88809851f468 R08: ffff88809bcde240 R09: ffffed1015d24733 R10: ffffed1015d24732 R11: ffff8880ae923993 R12: 0000000000001000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000200 FS: 00007f9db107a700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffdb1a5e660 CR3: 0000000082118000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: blk_mq_make_request+0x15e/0x1de0 block/blk-mq.c:1834 generic_make_request+0x747/0x12d0 block/blk-core.c:2461 submit_bio+0xba/0x480 block/blk-core.c:2570 submit_bh_wbc+0x5dc/0x790 fs/buffer.c:3095 submit_bh fs/buffer.c:3101 [inline] __sync_dirty_buffer+0x111/0x2e0 fs/buffer.c:3187 sync_dirty_buffer+0x1b/0x20 fs/buffer.c:3200 ext4_write_inode+0x475/0x510 fs/ext4/inode.c:5427 write_inode fs/fs-writeback.c:1227 [inline] __writeback_single_inode+0xc74/0x12c0 fs/fs-writeback.c:1426 writeback_single_inode+0x2c1/0x420 fs/fs-writeback.c:1480 sync_inode fs/fs-writeback.c:2517 [inline] sync_inode_metadata+0xa8/0xe0 fs/fs-writeback.c:2537 __generic_file_fsync+0x169/0x200 fs/libfs.c:988 ext4_sync_file+0x826/0x1450 fs/ext4/fsync.c:120 vfs_fsync_range+0x141/0x230 fs/sync.c:197 generic_write_sync include/linux/fs.h:2746 [inline] ext4_file_write_iter+0x7a0/0x1060 fs/ext4/file.c:281 call_write_iter include/linux/fs.h:1820 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x587/0x810 fs/read_write.c:487 vfs_write+0x20c/0x560 fs/read_write.c:549 ksys_write+0x14f/0x2d0 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:608 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f9db2ad819d Code: d1 20 00 00 75 10 b8 01 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 be fa ff ff 48 89 04 24 b8 01 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 07 fb ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007f9db1078f90 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000400 RCX: 00007f9db2ad819d RDX: 0000000000000400 RSI: 0000000001972ce0 RDI: 0000000000000006 RBP: 0000000001972ce0 R08: 000000000197308a R09: 00007f9db24551f7 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 00007f9db1079410 R14: 0000000001996720 R15: 0000000001972ae0