IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 INFO: task syz-executor.1:6921 blocked for more than 140 seconds. Not tainted 4.14.146 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D24992 6921 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2807 [inline] __schedule+0x7b8/0x1cd0 kernel/sched/core.c:3383 schedule+0x92/0x1c0 kernel/sched/core.c:3427 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3485 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x73c/0x1470 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 fuse_lock_inode+0xbc/0xf0 fs/fuse/inode.c:365 fuse_lookup+0x7a/0x380 fs/fuse/dir.c:360 lookup_slow+0x226/0x440 fs/namei.c:1695 walk_component+0x698/0x1d00 fs/namei.c:1824 link_path_walk+0x81f/0x10a0 fs/namei.c:2153 path_mountpoint+0xac/0x1970 fs/namei.c:2717 filename_mountpoint+0x16c/0x320 fs/namei.c:2744 user_path_mountpoint_at+0x3a/0x50 fs/namei.c:2774 SYSC_umount fs/namespace.c:1730 [inline] SyS_umount+0x10c/0x380 fs/namespace.c:1714 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45c457 RSP: 002b:00007fff76eb8bb8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6 RAX: ffffffffffffffda RBX: 00000000000815d8 RCX: 000000000045c457 RDX: 0000000000403520 RSI: 0000000000000002 RDI: 00007fff76eb8c60 RBP: 00000000000005dc R08: 0000000000000000 R09: 0000000000000010 R10: 000000000000000a R11: 0000000000000202 R12: 00007fff76eb9cf0 R13: 0000555556265940 R14: 0000000000000000 R15: 00007fff76eb9cf0 Showing all locks held in the system: 1 lock held by khungtaskd/1013: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4541 2 locks held by getty/6870: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156 2 locks held by getty/6871: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156 2 locks held by getty/6872: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156 2 locks held by getty/6873: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156 2 locks held by getty/6874: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156 2 locks held by getty/6875: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156 2 locks held by getty/6876: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156 2 locks held by syz-executor.1/6921: #0: (&type->i_mutex_dir_key#7){++++}, at: [] inode_lock_shared include/linux/fs.h:728 [inline] #0: (&type->i_mutex_dir_key#7){++++}, at: [] lookup_slow+0x138/0x440 fs/namei.c:1673 #1: (&fi->mutex){+.+.}, at: [] fuse_lock_inode+0xbc/0xf0 fs/fuse/inode.c:365 2 locks held by syz-executor.1/21950: #0: (sb_writers#18){.+.+}, at: [] sb_start_write include/linux/fs.h:1548 [inline] #0: (sb_writers#18){.+.+}, at: [] mnt_want_write+0x3f/0xb0 fs/namespace.c:386 #1: (&type->i_mutex_dir_key#7){++++}, at: [] inode_lock include/linux/fs.h:718 [inline] #1: (&type->i_mutex_dir_key#7){++++}, at: [] vfs_setxattr+0x91/0xf0 fs/xattr.c:219 2 locks held by syz-executor.1/23403: #0: (&type->i_mutex_dir_key#7){++++}, at: [] inode_lock_shared include/linux/fs.h:728 [inline] #0: (&type->i_mutex_dir_key#7){++++}, at: [] lookup_slow+0x138/0x440 fs/namei.c:1673 #1: (&fi->mutex){+.+.}, at: [] fuse_lock_inode+0xbc/0xf0 fs/fuse/inode.c:365 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1013 Comm: khungtaskd Not tainted 4.14.146 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x138/0x197 lib/dump_stack.c:53 nmi_cpu_backtrace.cold+0x57/0x94 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x141/0x189 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:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x5e7/0xb90 kernel/hung_task.c:274 kthread+0x319/0x430 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 6746 Comm: rs:main Q:Reg Not tainted 4.14.146 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88808b9963c0 task.stack: ffff88808b2d0000 RIP: 0010:sbitmap_for_each_set include/linux/sbitmap.h:234 [inline] RIP: 0010:bt_for_each block/blk-mq-tag.c:236 [inline] RIP: 0010:blk_mq_queue_tag_busy_iter+0x2aa/0x6f0 block/blk-mq-tag.c:350 RSP: 0018:ffff88808b2d72d0 EFLAGS: 00000246 RAX: 1ffff110147d2c00 RBX: ffff8880a3e96000 RCX: 0000000000000080 RDX: 0000000000000000 RSI: ffffffff82c918e0 RDI: ffff8880a3cecb18 RBP: ffff88808b2d73e8 R08: ffff88808b9963c0 R09: 0000000000000004 R10: 0000000000000000 R11: ffff88808b9963c0 R12: 1ffff1101165ae7f R13: ffff8880a1e43230 R14: ffff8880a3cecb00 R15: dffffc0000000000 FS: 00007fbfed59e700(0000) GS:ffff8880aee00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd8b122eb1 CR3: 00000000a1878000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: blk_mq_in_flight+0xc9/0x100 block/blk-mq.c:118 part_in_flight+0x23f/0x2b0 block/genhd.c:72 part_round_stats+0x19c/0x610 block/blk-core.c:1540 blk_account_io_start+0x535/0x990 block/blk-core.c:2529 blk_mq_bio_to_request block/blk-mq.c:1545 [inline] blk_mq_make_request+0x514/0x1c10 block/blk-mq.c:1749 generic_make_request block/blk-core.c:2227 [inline] generic_make_request+0x205/0xa40 block/blk-core.c:2171 submit_bio+0x1a5/0x3f0 block/blk-core.c:2301 submit_bh_wbc+0x550/0x720 fs/buffer.c:3152 submit_bh fs/buffer.c:3158 [inline] __sync_dirty_buffer fs/buffer.c:3244 [inline] __sync_dirty_buffer+0xcf/0x260 fs/buffer.c:3235 sync_dirty_buffer+0x1b/0x20 fs/buffer.c:3257 ext4_write_inode+0x3c2/0x450 fs/ext4/inode.c:5264 write_inode fs/fs-writeback.c:1224 [inline] __writeback_single_inode+0xb44/0x1120 fs/fs-writeback.c:1423 writeback_single_inode+0x1fa/0x380 fs/fs-writeback.c:1477 sync_inode fs/fs-writeback.c:2505 [inline] sync_inode_metadata+0x8c/0xb0 fs/fs-writeback.c:2525 __generic_file_fsync+0x130/0x1a0 fs/libfs.c:988 ext4_sync_file+0x755/0x12d0 fs/ext4/fsync.c:120 vfs_fsync_range+0x10e/0x260 fs/sync.c:196 generic_write_sync include/linux/fs.h:2677 [inline] ext4_file_write_iter+0x68a/0xe90 fs/ext4/file.c:279 call_write_iter include/linux/fs.h:1777 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x4a7/0x6b0 fs/read_write.c:482 vfs_write+0x198/0x500 fs/read_write.c:544 SYSC_write fs/read_write.c:590 [inline] SyS_write+0xfd/0x230 fs/read_write.c:582 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x7fbfeeffc19d RSP: 002b:00007fbfed59cf90 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000400 RCX: 00007fbfeeffc19d RDX: 0000000000000400 RSI: 00000000015fa340 RDI: 0000000000000006 RBP: 00000000015fa340 R08: 302b796669746f6e R09: 5d3234383430332e R10: 676e7568203f2020 R11: 0000000000000293 R12: 0000000000000000 R13: 00007fbfed59d410 R14: 00000000016901d0 R15: 00000000015fa140 Code: 00 0f 85 c0 03 00 00 8b 9d 70 ff ff ff 48 c1 e3 06 49 03 5e 20 48 89 d8 48 c1 e8 03 42 80 3c 38 00 0f 85 93 03 00 00 48 83 3b 00 <75> 77 e8 bf 84 92 fe 83 85 70 ff ff ff 01 8b 85 70 ff ff ff 41