INFO: task kworker/0:1H:2015 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:27048 pid: 2015 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.1:21838 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.1 state:D stack:26640 pid:21838 ppid: 8386 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:00007fa3ebf16fa8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 000000000046797a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fa3ebf17000 RBP: 00007fa3ebf17040 R08: 00007fa3ebf17040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000 R13: 0000000020000100 R14: 00007fa3ebf17000 R15: 0000000020047a20 Showing all locks held in the system: 1 lock held by khungtaskd/1600: #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/2015: #0: ffff8880178c8938 ((wq_completion)glock_workqueue){+.+.}-{0:0}, at: process_one_work+0x6f4/0xfd0 kernel/workqueue.c:2248 #1: ffffc900071c7d78 ((work_completion)(&(&gl->gl_work)->work)){+.+.}-{0:0}, at: process_one_work+0x733/0xfd0 kernel/workqueue.c:2250 #2: ffff8880132460e0 (&type->s_umount_key#74){+.+.}-{3:3}, at: freeze_super+0x44/0x3c0 fs/super.c:1664 1 lock held by systemd-journal/4820: #0: ffff8880b9d34c98 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1321 [inline] #0: ffff8880b9d34c98 (&rq->lock){-.-.}-{2:2}, at: __schedule+0xd8/0xe70 kernel/sched/core.c:4990 1 lock held by in:imklog/8089: #0: ffff8880191bcaf0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:961 1 lock held by syz-executor.1/21838: #0: ffff8880132460e0 (&type->s_umount_key#64/1){+.+.}-{3:3}, at: alloc_super+0x1c8/0x860 fs/super.c:229 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1600 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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4820 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: 0033:0x7fa74080dc2d Code: 0c 00 ba da 00 00 00 e8 21 04 fd ff 90 48 83 ec 08 48 85 ff 74 47 85 f6 78 63 4d 85 c0 74 7e 4c 8b 4f 28 31 c0 4d 85 c9 74 06 <41> 3b 71 08 74 0d 48 83 c4 08 c3 0f 1f 84 00 00 00 00 00 39 57 0c RSP: 002b:00007ffd293da070 EFLAGS: 00000206 RAX: 0000000000000000 RBX: 000000000012b388 RCX: 000000000012b388 RDX: 0000000000000003 RSI: 0000000000000010 RDI: 0000556050479120 RBP: 0000556050475040 R08: 0000000000000053 R09: 0000556050478da0 R10: 00007ffd293f70b8 R11: 00007fa73e0f8290 R12: 0000000000000001 R13: 0000000000000003 R14: 0000000000000010 R15: 00005560504793b0 FS: 00007fa740bd88c0 GS: 0000000000000000