INFO: task kworker/0:1H:2911 blocked for more than 143 seconds. Not tainted 5.12.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:1H state:D stack:28680 pid: 2911 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.3:12178 blocked for more than 143 seconds. Not tainted 5.12.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:26552 pid:12178 ppid: 8401 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:00007fc922a93fa8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 000000000046797a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fc922a94000 RBP: 00007fc922a94040 R08: 00007fc922a94040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000 R13: 0000000020000100 R14: 00007fc922a94000 R15: 0000000020047a20 Showing all locks held in the system: 1 lock held by khungtaskd/1599: #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/2911: #0: ffff8880178e3138 ((wq_completion)glock_workqueue){+.+.}-{0:0}, at: process_one_work+0x6f4/0xfd0 kernel/workqueue.c:2248 #1: ffffc900017ffd78 ((work_completion)(&(&gl->gl_work)->work)){+.+.}-{0:0}, at: process_one_work+0x733/0xfd0 kernel/workqueue.c:2250 #2: ffff88802768e0e0 (&type->s_umount_key#64){+.+.}-{3:3}, at: freeze_super+0x44/0x3c0 fs/super.c:1664 1 lock held by in:imklog/8080: #0: ffff888018e859f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:961 2 locks held by kworker/u4:9/11527: #0: ffff8880b9c34c98 (&rq->lock){-.-.}-{2:2}, at: newidle_balance+0x82e/0xb00 kernel/sched/fair.c:10633 #1: ffffffff8c710180 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 arch/x86/pci/mmconfig_64.c:151 1 lock held by syz-executor.3/12178: #0: ffff88802768e0e0 (&type->s_umount_key#63/1){+.+.}-{3:3}, at: alloc_super+0x1c8/0x860 fs/super.c:229 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1599 Comm: khungtaskd Not tainted 5.12.0-rc5-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: 9654 Comm: kworker/1:5 Not tainted 5.12.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events nsim_dev_trap_report_work RIP: 0010:trace_lock_acquire+0x43/0x180 include/trace/events/lock.h:13 Code: 08 0f 83 86 00 00 00 89 c3 48 89 d8 48 c1 e8 06 48 8d 3c c5 68 c1 b4 8d be 08 00 00 00 e8 75 99 60 00 48 0f a3 1d 85 5a 58 0c <73> 52 65 83 05 9b 88 a5 7e 01 48 8b 05 54 94 45 0c e8 67 b3 f5 07 RSP: 0018:ffffc900165ffa30 EFLAGS: 00000057 RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff815c66db RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8db4c168 RBP: 0000000000000001 R08: dffffc0000000000 R09: fffffbfff1b6982e R10: fffffbfff1b6982e R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: ffff888011532960 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1cc7c37000 CR3: 0000000025bb9000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x39/0x650 kernel/locking/lockdep.c:5481 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x73/0xa0 kernel/locking/spinlock.c:159 _crng_backtrack_protect drivers/char/random.c:1045 [inline] crng_backtrack_protect+0xf3/0x500 drivers/char/random.c:1063 _get_random_bytes+0x171/0x1b0 drivers/char/random.c:1550 eth_random_addr include/linux/etherdevice.h:225 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:521 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:570 [inline] nsim_dev_trap_report_work+0x359/0xb20 drivers/net/netdevsim/dev.c:611 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