INFO: task kworker/0:1H:2921 blocked for more than 143 seconds. Not tainted 5.12.0-rc4-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:1H state:D stack:28248 pid: 2921 ppid: 2 flags:0x00004000 Workqueue: glock_workqueue glock_work_func Call Trace: context_switch kernel/sched/core.c:4322 [inline] __schedule+0x999/0xe70 kernel/sched/core.c:5073 schedule+0x14b/0x200 kernel/sched/core.c:5152 rwsem_down_write_slowpath+0xd69/0x1370 kernel/locking/rwsem.c:1106 __down_write_common kernel/locking/rwsem.c:1261 [inline] __down_write kernel/locking/rwsem.c:1270 [inline] down_write+0x117/0x120 kernel/locking/rwsem.c:1407 freeze_super+0x44/0x3c0 fs/super.c:1664 freeze_go_sync+0x17b/0x3a0 fs/gfs2/glops.c:574 do_xmote+0x6b7/0x14c0 fs/gfs2/glock.c:630 glock_work_func+0x2c3/0x450 fs/gfs2/glock.c:934 process_one_work+0x789/0xfd0 kernel/workqueue.c:2275 worker_thread+0xac1/0x1300 kernel/workqueue.c:2421 kthread+0x39a/0x3c0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 INFO: task syz-executor.5:15484 blocked for more than 143 seconds. Not tainted 5.12.0-rc4-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:26640 pid:15484 ppid: 12004 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4322 [inline] __schedule+0x999/0xe70 kernel/sched/core.c:5073 schedule+0x14b/0x200 kernel/sched/core.c:5152 schedule_timeout+0x43/0x250 kernel/time/timer.c:1868 do_wait_for_common+0x266/0x3a0 kernel/sched/completion.c:85 __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x48/0x60 kernel/sched/completion.c:138 flush_workqueue+0x704/0x1620 kernel/workqueue.c:2838 gfs2_gl_hash_clear+0x6e/0x270 fs/gfs2/glock.c:1998 gfs2_fill_super+0x352c/0x44c0 fs/gfs2/ops_fstype.c:1254 get_tree_bdev+0x406/0x630 fs/super.c:1292 gfs2_get_tree+0x50/0x200 fs/gfs2/ops_fstype.c:1277 vfs_get_tree+0x86/0x270 fs/super.c:1497 do_new_mount fs/namespace.c:2903 [inline] path_mount+0x188a/0x29a0 fs/namespace.c:3233 do_mount fs/namespace.c:3246 [inline] __do_sys_mount fs/namespace.c:3454 [inline] __se_sys_mount+0x28c/0x320 fs/namespace.c:3431 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x46797a RSP: 002b:00007f0a3bbe4fa8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 000000000046797a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f0a3bbe5000 RBP: 00007f0a3bbe5040 R08: 00007f0a3bbe5040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000 R13: 0000000020000100 R14: 00007f0a3bbe5000 R15: 0000000020047a20 Showing all locks held in the system: 1 lock held by khungtaskd/1618: #0: ffffffff8c710180 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 arch/x86/pci/mmconfig_64.c:151 3 locks held by kworker/0:1H/2921: #0: ffff8880177f5938 ((wq_completion)glock_workqueue){+.+.}-{0:0}, at: process_one_work+0x6f4/0xfd0 kernel/workqueue.c:2248 #1: ffffc9000189fd78 ((work_completion)(&(&gl->gl_work)->work)){+.+.}-{0:0}, at: process_one_work+0x733/0xfd0 kernel/workqueue.c:2250 #2: ffff88806dc840e0 (&type->s_umount_key#77){+.+.}-{3:3}, at: freeze_super+0x44/0x3c0 fs/super.c:1664 2 locks held by systemd-journal/4824: 1 lock held by in:imklog/8099: #0: ffff8880151aa370 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:961 5 locks held by kworker/0:9/9827: 1 lock held by syz-executor.5/15484: #0: ffff88806dc840e0 (&type->s_umount_key#76/1){+.+.}-{3:3}, at: alloc_super+0x1c8/0x860 fs/super.c:229 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1618 Comm: khungtaskd Not tainted 5.12.0-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:79 [inline] dump_stack+0x176/0x24e lib/dump_stack.c:120 nmi_cpu_backtrace+0x16c/0x190 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x191/0x2f0 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+0xcfb/0xd40 kernel/hung_task.c:294 kthread+0x39a/0x3c0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4824 Comm: systemd-journal Not tainted 5.12.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline] RIP: 0010:debug_write_unlock kernel/locking/spinlock_debug.c:197 [inline] RIP: 0010:do_raw_write_unlock+0x60/0x360 kernel/locking/spinlock_debug.c:228 Code: de 0f 85 b9 00 00 00 49 8d 6e 10 48 89 eb 48 c1 eb 03 80 3c 13 00 74 12 48 89 ef e8 0a 42 5e 00 48 ba 00 00 00 00 00 fc ff df <65> 4c 8b 3c 25 80 ef 01 00 4c 39 7d 00 0f 85 01 01 00 00 4d 8d 6e RSP: 0018:ffffc90000ecfcc0 EFLAGS: 00000046 RAX: 1ffff110024d7400 RBX: 1ffff110024d74aa RCX: dffffc0000000000 RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffff8880126ba540 RBP: ffff8880126ba550 R08: dffffc0000000000 R09: fffffbfff1b6b276 R10: fffffbfff1b6b276 R11: 0000000000000000 R12: ffff888025626cd8 R13: 0000000000000014 R14: ffff8880126ba540 R15: dffffc0000000000 FS: 00007fc25552a8c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc252840000 CR3: 000000002674f000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_write_unlock_irq include/linux/rwlock_api_smp.h:266 [inline] _raw_write_unlock_irq+0x1a/0x40 kernel/locking/spinlock.c:343 ep_start_scan fs/eventpoll.c:617 [inline] ep_send_events fs/eventpoll.c:1641 [inline] ep_poll+0x728/0x1d70 fs/eventpoll.c:1792 do_epoll_wait+0x1b2/0x230 fs/eventpoll.c:2220 __do_sys_epoll_wait fs/eventpoll.c:2232 [inline] __se_sys_epoll_wait fs/eventpoll.c:2227 [inline] __x64_sys_epoll_wait+0x22e/0x260 fs/eventpoll.c:2227 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fc2547f3303 Code: 49 89 ca b8 e8 00 00 00 0f 05 48 3d 01 f0 ff ff 73 34 c3 48 83 ec 08 e8 0b c2 00 00 48 89 04 24 49 89 ca b8 e8 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 51 c2 00 00 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007ffdbf4793a0 EFLAGS: 00000293 ORIG_RAX: 00000000000000e8 RAX: ffffffffffffffda RBX: 000055a74aacc1e0 RCX: 00007fc2547f3303 RDX: 0000000000000014 RSI: 00007ffdbf4793b0 RDI: 0000000000000008 RBP: 00007ffdbf4795a0 R08: 00007ffdbf569080 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000293 R12: 00007ffdbf4793b0 R13: 0000000000000001 R14: ffffffffffffffff R15: 0005be38d2f388d6