INFO: task syz-executor.0:10917 blocked for more than 143 seconds. Not tainted 5.10.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:26104 pid:10917 ppid: 8506 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3774 [inline] __schedule+0x893/0x2130 kernel/sched/core.c:4523 schedule+0xcf/0x270 kernel/sched/core.c:4601 schedule_timeout+0x148/0x250 kernel/time/timer.c:1876 gfs2_gl_hash_clear+0x240/0x270 fs/gfs2/glock.c:1989 gfs2_fill_super+0x1e81/0x23f0 fs/gfs2/ops_fstype.c:1233 get_tree_bdev+0x421/0x740 fs/super.c:1344 gfs2_get_tree+0x4a/0x270 fs/gfs2/ops_fstype.c:1256 vfs_get_tree+0x89/0x2f0 fs/super.c:1549 do_new_mount fs/namespace.c:2875 [inline] path_mount+0x13ad/0x20c0 fs/namespace.c:3205 do_mount fs/namespace.c:3218 [inline] __do_sys_mount fs/namespace.c:3426 [inline] __se_sys_mount fs/namespace.c:3403 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3403 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x46090a Code: Unable to access opcode bytes at RIP 0x4608e0. RSP: 002b:00007f87497aaa88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f87497aab20 RCX: 000000000046090a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f87497aaae0 RBP: 00007f87497aaae0 R08: 00007f87497aab20 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000 R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020047a20 Showing all locks held in the system: 2 locks held by kworker/u4:3/83: 1 lock held by khungtaskd/1637: #0: ffffffff8b337060 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6259 1 lock held by in:imklog/8169: #0: ffff8880227dbdf0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:932 1 lock held by syz-executor.0/10917: #0: ffff88806171a0e0 (&type->s_umount_key#70/1){+.+.}-{3:3}, at: alloc_super+0x1b8/0xa80 fs/super.c:229 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1637 Comm: khungtaskd Not tainted 5.10.0-rc1-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+0x107/0x163 lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0xd43/0xfa0 kernel/hung_task.c:295 kthread+0x3af/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 8170 Comm: rs:main Q:Reg Not tainted 5.10.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:update_sd_lb_stats.constprop.0+0x1034/0x29d0 kernel/sched/fair.c:8918 Code: 0f 85 84 15 00 00 48 8b 04 24 83 78 2c 02 0f 84 1c 04 00 00 48 8b 44 24 10 48 83 c0 10 48 89 84 24 80 00 00 00 48 8b 44 24 58 <0f> b6 00 38 44 24 7b 7c 08 84 c0 0f 85 3d 15 00 00 48 8b 04 24 8b RSP: 0018:ffffc9000be7f258 EFLAGS: 00000016 RAX: fffff520017cfedd RBX: ffffc9000be7f500 RCX: ffffc9000be7f704 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff888010edb620 RBP: ffff888010edb600 R08: 0000000000000000 R09: ffff888010edb6a7 R10: ffffed10021db6d4 R11: 0000000000000001 R12: 00000000fffffb31 R13: dffffc0000000000 R14: ffff888010edb6a0 R15: 0000000000000000 FS: 00007f2a19a11700(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f40afe4f010 CR3: 0000000027f01000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: find_busiest_group+0x9a/0x820 kernel/sched/fair.c:9174 load_balance+0x383/0x2ce0 kernel/sched/fair.c:9544 newidle_balance+0x6b3/0xe50 kernel/sched/fair.c:10554 pick_next_task_fair+0x91/0xc90 kernel/sched/fair.c:7101 pick_next_task kernel/sched/core.c:4340 [inline] __schedule+0x368/0x2130 kernel/sched/core.c:4491 schedule+0xcf/0x270 kernel/sched/core.c:4601 freezable_schedule include/linux/freezer.h:172 [inline] futex_wait_queue_me+0x2a7/0x570 kernel/futex.c:2589 futex_wait+0x1df/0x560 kernel/futex.c:2691 do_futex+0x15b/0x1a20 kernel/futex.c:3750 __do_sys_futex+0x2a2/0x470 kernel/futex.c:3813 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f2a1c45217f Code: 30 83 f8 20 75 15 be 8b 00 00 00 b8 ca 00 00 00 0f 05 83 f8 00 41 0f 94 c0 eb 0f be 80 00 00 00 45 30 c0 b8 ca 00 00 00 0f 05 <8b> 3c 24 e8 49 2d 00 00 48 8b 7c 24 08 be 01 00 00 00 31 c0 f0 0f RSP: 002b:00007f2a19a10c70 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2a1c45217f RDX: 0000000000000513 RSI: 0000000000000080 RDI: 000055ba6278028c RBP: 000055ba62780288 R08: 000055ba62780000 R09: 0000000000000289 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2a19a10cd0 R13: 0000000000000000 R14: 000055ba61868290 R15: 0000000000000000