INFO: task syz-executor249:8991 blocked for more than 143 seconds. Not tainted 5.6.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor249 D27560 8991 8989 0x00004000 Call Trace: context_switch kernel/sched/core.c:3380 [inline] __schedule+0x87f/0xcd0 kernel/sched/core.c:4080 schedule+0x188/0x210 kernel/sched/core.c:4154 xlog_grant_head_wait+0x2a5/0x4f0 fs/xfs/xfs_log.c:278 xlog_grant_head_check+0x221/0x3d0 fs/xfs/xfs_log.c:332 xfs_log_reserve+0x238/0x5d0 fs/xfs/xfs_log.c:465 xfs_log_write_unmount_record fs/xfs/xfs_log.c:890 [inline] xfs_log_unmount_write fs/xfs/xfs_log.c:986 [inline] xfs_log_quiesce+0x35c/0x820 fs/xfs/xfs_log.c:1049 xfs_log_unmount fs/xfs/xfs_log.c:1063 [inline] xfs_log_mount_cancel+0x51/0xc0 fs/xfs/xfs_log.c:854 xfs_mountfs+0x14d4/0x1d90 fs/xfs/xfs_mount.c:1022 xfs_fc_fill_super+0xd29/0x1160 fs/xfs/xfs_super.c:1495 get_tree_bdev+0x40b/0x650 fs/super.c:1342 xfs_fc_get_tree+0x1c/0x20 fs/xfs/xfs_super.c:1539 vfs_get_tree+0x8b/0x2a0 fs/super.c:1547 do_new_mount fs/namespace.c:2822 [inline] do_mount+0x18ee/0x25a0 fs/namespace.c:3107 __do_sys_mount fs/namespace.c:3316 [inline] __se_sys_mount+0xdd/0x110 fs/namespace.c:3293 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3293 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x44761a Code: Bad RIP value. RSP: 002b:00007ffd4da28478 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffd4da28650 RCX: 000000000044761a RDX: 00007ffd4da284c0 RSI: 0000000020000000 RDI: 00007ffd4da284e0 RBP: 0000000000000000 R08: 00007ffd4da28520 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/1142: #0: ffffffff892d9948 (rcu_read_lock){....}, at: rcu_lock_acquire+0x4/0x30 include/linux/rcupdate.h:207 2 locks held by rsyslogd/8877: #0: ffff888097faf8e0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x279/0x310 fs/file.c:821 #1: ffff8880aeb37198 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1215 [inline] #1: ffff8880aeb37198 (&rq->lock){-.-.}, at: __schedule+0xdb/0xcd0 kernel/sched/core.c:4028 2 locks held by getty/8967: #0: ffff88809f583090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267 #1: ffffc900017bb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156 2 locks held by getty/8968: #0: ffff88809f353090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267 #1: ffffc900017cb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156 2 locks held by getty/8969: #0: ffff8880972a3090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267 #1: ffffc900017eb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156 2 locks held by getty/8970: #0: ffff88809f699090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267 #1: ffffc900017db2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156 2 locks held by getty/8971: #0: ffff888092406090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267 #1: ffffc9000180b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156 2 locks held by getty/8972: #0: ffff88809f57e090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267 #1: ffffc900017fb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156 2 locks held by getty/8973: #0: ffff88809f325090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267 #1: ffffc9000175b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156 1 lock held by syz-executor249/8991: #0: ffff8880a25260d8 (&type->s_umount_key#40/1){+.+.}, at: alloc_super+0x15f/0x790 fs/super.c:229 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1142 Comm: khungtaskd Not tainted 5.6.0-rc3-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+0x1fb/0x318 lib/dump_stack.c:118 nmi_cpu_backtrace+0xaa/0x190 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x16f/0x290 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace+0x17/0x20 include/linux/nmi.h:146 check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0xd40/0xd60 kernel/hung_task.c:289 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.6.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:26 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:153 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x11/0x50 kernel/kcov.c:187 Code: fb e8 13 00 00 00 48 8b 3d f4 a1 f2 07 48 89 de e8 84 b4 3c 00 5b 5d c3 cc 55 48 89 e5 48 8b 45 08 65 48 8b 0c 25 c0 1d 02 00 <65> 8b 15 34 04 8b 7e f7 c2 00 01 1f 00 75 2c 8b 91 80 13 00 00 83 RSP: 0018:ffffc90000d3fda8 EFLAGS: 00000093 RAX: ffffffff83a4db29 RBX: ffff8880a99f4340 RCX: ffff8880a99f4340 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000d3fda8 R08: ffffffff85d26f23 R09: ffffed101533e869 R10: ffffed101533e869 R11: 0000000000000000 R12: dffffc0000000000 R13: dffffc0000000000 R14: 0000000000000001 R15: 1ffffffff1255a6b FS: 0000000000000000(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000000a2ac3000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: debug_smp_processor_id+0x9/0x20 lib/smp_processor_id.c:56 tick_nohz_idle_stop_tick+0x25/0x800 kernel/time/tick-sched.c:988 cpuidle_idle_call kernel/sched/idle.c:151 [inline] do_idle+0x1e2/0x630 kernel/sched/idle.c:269 cpu_startup_entry+0x25/0x30 kernel/sched/idle.c:361 start_secondary+0x384/0x410 arch/x86/kernel/smpboot.c:264 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:242