INFO: task syz-executor.5:11810 can't die for more than 143 seconds. task:syz-executor.5 state:D stack:25896 pid:11810 ppid: 8537 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3773 [inline] __schedule+0x893/0x2130 kernel/sched/core.c:4522 schedule+0xcf/0x270 kernel/sched/core.c:4600 schedule_timeout+0x148/0x250 kernel/time/timer.c:1881 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:2896 [inline] path_mount+0x12ae/0x1e70 fs/namespace.c:3227 do_mount fs/namespace.c:3240 [inline] __do_sys_mount fs/namespace.c:3448 [inline] __se_sys_mount fs/namespace.c:3425 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3425 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4608aa Code: Unable to access opcode bytes at RIP 0x460880. RSP: 002b:00007fa541476a88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fa541476b20 RCX: 00000000004608aa RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fa541476ae0 RBP: 00007fa541476ae0 R08: 00007fa541476b20 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000 R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020047a20 INFO: task syz-executor.5:11810 blocked for more than 143 seconds. Not tainted 5.9.0-next-20201023-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:25896 pid:11810 ppid: 8537 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3773 [inline] __schedule+0x893/0x2130 kernel/sched/core.c:4522 schedule+0xcf/0x270 kernel/sched/core.c:4600 schedule_timeout+0x148/0x250 kernel/time/timer.c:1881 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:2896 [inline] path_mount+0x12ae/0x1e70 fs/namespace.c:3227 do_mount fs/namespace.c:3240 [inline] __do_sys_mount fs/namespace.c:3448 [inline] __se_sys_mount fs/namespace.c:3425 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3425 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4608aa Code: Unable to access opcode bytes at RIP 0x460880. RSP: 002b:00007fa541476a88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fa541476b20 RCX: 00000000004608aa RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fa541476ae0 RBP: 00007fa541476ae0 R08: 00007fa541476b20 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000 R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020047a20 Showing all locks held in the system: 1 lock held by khungtaskd/1653: #0: ffffffff8b3361a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6259 1 lock held by in:imklog/8197: 1 lock held by syz-executor.5/11810: #0: ffff88806f1c00e0 (&type->s_umount_key#55/1){+.+.}-{3:3}, at: alloc_super+0x201/0xaf0 fs/super.c:229 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1653 Comm: khungtaskd Not tainted 5.9.0-next-20201023-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:147 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline] watchdog+0xd89/0xf30 kernel/hung_task.c:339 kthread+0x3af/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 3114 Comm: kworker/u4:5 Not tainted 5.9.0-next-20201023-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet RIP: 0010:separate_irq_context kernel/locking/lockdep.c:4360 [inline] RIP: 0010:__lock_acquire+0x9d9/0x5590 kernel/locking/lockdep.c:4821 Code: 0f 85 6f 3c 00 00 48 8d 7d 21 45 0f b6 6d 21 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 48 89 fa 83 e2 07 <38> d0 7f 08 84 c0 0f 85 35 3c 00 00 44 32 6d 21 41 83 e5 60 0f 85 RSP: 0018:ffffc90000007998 EFLAGS: 00000002 RAX: 0000000000000000 RBX: daaee4fb273fb377 RCX: ffff88801a423e18 RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88801a423f01 RBP: ffff88801a423ee0 R08: 0000000000000000 R09: ffffffff8ebac667 R10: 0000000000000005 R11: 0000000000000000 R12: ffff88801a423500 R13: 0000000000000026 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa2eda31018 CR3: 0000000013ddf000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire kernel/locking/lockdep.c:5442 [inline] lock_acquire+0x1af/0x8b0 kernel/locking/lockdep.c:5407 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:159 debug_object_activate+0x12e/0x3e0 lib/debugobjects.c:656 debug_work_activate kernel/workqueue.c:490 [inline] __queue_work+0x94/0xf00 kernel/workqueue.c:1412 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1415 expire_timers kernel/time/timer.c:1455 [inline] __run_timers.part.0+0x4a6/0xa50 kernel/time/timer.c:1757 __run_timers kernel/time/timer.c:1738 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1770 __do_softirq+0x2a0/0x9f6 kernel/softirq.c:298 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x132/0x200 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0010:lock_acquire+0x1d9/0x8b0 kernel/locking/lockdep.c:5410 Code: 48 c7 c7 20 4e 4b 89 48 83 c4 20 e8 41 d2 8e 07 b8 ff ff ff ff 65 0f c1 05 d4 91 ac 7e 83 f8 01 0f 85 b3 04 00 00 ff 34 24 9d <48> b8 00 00 00 00 00 fc ff df 48 01 c3 48 c7 03 00 00 00 00 48 c7 RSP: 0018:ffffc9000215fab8 EFLAGS: 00000246 RAX: 0000000000000001 RBX: 1ffff9200042bf59 RCX: 00000000c1a22ef2 RDX: 1ffff110034847c2 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8ebac667 R10: fffffbfff1d758cc R11: 0000000000000000 R12: 0000000000000002 R13: ffffffff8b3361a0 R14: 0000000000000000 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:248 [inline] rcu_read_lock include/linux/rcupdate.h:641 [inline] batadv_iv_ogm_slide_own_bcast_window net/batman-adv/bat_iv_ogm.c:755 [inline] batadv_iv_ogm_schedule_buff+0x5d0/0x1410 net/batman-adv/bat_iv_ogm.c:826 batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:870 [inline] batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:863 [inline] batadv_iv_send_outstanding_bat_ogm_packet+0x5c8/0x800 net/batman-adv/bat_iv_ogm.c:1724 process_one_work+0x933/0x15a0 kernel/workqueue.c:2272 worker_thread+0x64c/0x1120 kernel/workqueue.c:2418 kthread+0x3af/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296