INFO: task syz-executor665:9596 blocked for more than 143 seconds. Not tainted 5.6.0-rc4-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor665 D26976 9596 9594 0x00004000 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4154 xlog_grant_head_wait+0x422/0xd40 fs/xfs/xfs_log.c:278 xlog_grant_head_check+0x3b9/0x410 fs/xfs/xfs_log.c:340 xfs_log_reserve+0x34b/0xac0 fs/xfs/xfs_log.c:465 xfs_log_write_unmount_record+0x167/0x880 fs/xfs/xfs_log.c:890 xfs_log_unmount_write fs/xfs/xfs_log.c:986 [inline] xfs_log_quiesce+0x397/0x510 fs/xfs/xfs_log.c:1049 xfs_log_unmount+0x1d/0xb0 fs/xfs/xfs_log.c:1063 xfs_mountfs+0x15ea/0x1f80 fs/xfs/xfs_mount.c:1022 xfs_fc_fill_super+0x89b/0x1220 fs/xfs/xfs_super.c:1495 get_tree_bdev+0x3f8/0x710 fs/super.c:1342 vfs_get_tree+0x89/0x2f0 fs/super.c:1547 do_new_mount fs/namespace.c:2822 [inline] do_mount+0x1306/0x1a60 fs/namespace.c:3107 __do_sys_mount fs/namespace.c:3316 [inline] __se_sys_mount fs/namespace.c:3293 [inline] __x64_sys_mount+0x18f/0x230 fs/namespace.c:3293 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x44761a Code: Bad RIP value. RSP: 002b:00007ffdba793dd8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffdba793fb0 RCX: 000000000044761a RDX: 00007ffdba793e20 RSI: 0000000020000000 RDI: 00007ffdba793e40 RBP: 0000000000000000 R08: 00007ffdba793e80 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000402900 R13: 0000000000402990 R14: 0000000000000000 R15: 0000000000000000 Showing all locks held in the system: 1 lock held by khungtaskd/1094: #0: ffffffff897accc0 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5331 1 lock held by rsyslogd/9480: #0: ffff8880a0053920 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xe3/0x100 fs/file.c:821 2 locks held by getty/9570: #0: ffff88809ef9d090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267 #1: ffffc9000188b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 drivers/tty/n_tty.c:2156 2 locks held by getty/9571: #0: ffff8880a8ddb090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267 #1: ffffc9000185b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 drivers/tty/n_tty.c:2156 2 locks held by getty/9572: #0: ffff8880a60ea090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267 #1: ffffc9000183b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 drivers/tty/n_tty.c:2156 2 locks held by getty/9573: #0: ffff88809edae090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267 #1: ffffc9000182b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 drivers/tty/n_tty.c:2156 2 locks held by getty/9574: #0: ffff8880a19b7090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267 #1: ffffc9000184b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 drivers/tty/n_tty.c:2156 2 locks held by getty/9575: #0: ffff88808d9d3090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267 #1: ffffc9000186b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 drivers/tty/n_tty.c:2156 2 locks held by getty/9576: #0: ffff8880a7030090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267 #1: ffffc900017cb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 drivers/tty/n_tty.c:2156 1 lock held by syz-executor665/9596: #0: ffff8880a44700d8 (&type->s_umount_key#40/1){+.+.}, at: alloc_super+0x152/0x910 fs/super.c:229 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1094 Comm: khungtaskd Not tainted 5.6.0-rc4-syzkaller #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+0x188/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x231/0x27e lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0xa8c/0x1010 kernel/hung_task.c:289 kthread+0x357/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60