INFO: task syz-executor.3:11011 blocked for more than 143 seconds. Not tainted 5.12.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:28320 pid:11011 ppid: 8415 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4324 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5075 schedule+0xcf/0x270 kernel/sched/core.c:5154 schedule_timeout+0x1db/0x250 kernel/time/timer.c:1868 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x168/0x270 kernel/sched/completion.c:138 io_sq_thread_park fs/io_uring.c:7115 [inline] io_sq_thread_park+0xd5/0x130 fs/io_uring.c:7103 io_uring_cancel_task_requests+0x24c/0xd90 fs/io_uring.c:8745 __io_uring_files_cancel+0x110/0x230 fs/io_uring.c:8840 io_uring_files_cancel include/linux/io_uring.h:47 [inline] do_exit+0x299/0x2a60 kernel/exit.c:780 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x42c/0x2100 kernel/signal.c:2773 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:811 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x148/0x250 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465ef9 RSP: 002b:00007fdfa88a9218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000056bf68 RCX: 0000000000465ef9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000056bf68 RBP: 000000000056bf60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf6c R13: 00007ffee67db7df R14: 00007fdfa88a9300 R15: 0000000000022000 INFO: task iou-sqp-11011:11012 blocked for more than 143 seconds. Not tainted 5.12.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:iou-sqp-11011 state:D stack:30296 pid:11012 ppid: 8415 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4324 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5075 schedule+0xcf/0x270 kernel/sched/core.c:5154 schedule_timeout+0x1db/0x250 kernel/time/timer.c:1868 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x168/0x270 kernel/sched/completion.c:138 io_sq_thread+0x27d/0x1ae0 fs/io_uring.c:6717 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 INFO: task iou-sqp-11011:11016 blocked for more than 143 seconds. Not tainted 5.12.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:iou-sqp-11011 state:D stack:30296 pid:11016 ppid: 8415 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4324 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5075 schedule+0xcf/0x270 kernel/sched/core.c:5154 schedule_timeout+0x1db/0x250 kernel/time/timer.c:1868 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x168/0x270 kernel/sched/completion.c:138 io_sq_thread+0x27d/0x1ae0 fs/io_uring.c:6717 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Showing all locks held in the system: 1 lock held by khungtaskd/1666: #0: ffffffff8bf741a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6327 1 lock held by in:imklog/8103: #0: ffff88801d8a2ff0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:961 1 lock held by syz-executor.3/11011: #0: ffff888143c31870 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park+0x5d/0x130 fs/io_uring.c:7108 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1666 Comm: khungtaskd Not tainted 5.12.0-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:79 [inline] dump_stack+0xfa/0x151 lib/dump_stack.c:120 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+0xd48/0xfb0 kernel/hung_task.c:294 kthread+0x3b1/0x4a0 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: 8864 Comm: kworker/u4:3 Not tainted 5.12.0-rc1-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:bytes_is_nonzero mm/kasan/generic.c:85 [inline] RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:177 [inline] RIP: 0010:kasan_check_range+0xde/0x180 mm/kasan/generic.c:186 Code: 74 f2 48 89 c2 b8 01 00 00 00 48 85 d2 75 56 5b 5d 41 5c c3 48 85 d2 74 5e 48 01 ea eb 09 48 83 c0 01 48 39 d0 74 50 80 38 00 <74> f2 eb d4 41 bc 08 00 00 00 48 89 ea 45 29 dc 4d 8d 1c 2c eb 0c RSP: 0018:ffffc90000db05a0 EFLAGS: 00000046 RAX: fffffbfff1f56d0c RBX: fffffbfff1f56d0d RCX: ffffffff8158ae3f RDX: fffffbfff1f56d0d RSI: 0000000000000008 RDI: ffffffff8fab6860 RBP: fffffbfff1f56d0c R08: 0000000000000000 R09: ffffffff8fab6867 R10: fffffbfff1f56d0c R11: 000000000000003f R12: 0000000000000008 R13: ffff888023b625c8 R14: 0000000000000000 R15: ffff888023b625e8 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb44c241000 CR3: 000000001d4b9000 CR4: 0000000000350ee0 Call Trace: instrument_atomic_read include/linux/instrumented.h:71 [inline] test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline] hlock_class kernel/locking/lockdep.c:198 [inline] mark_lock+0xef/0x17b0 kernel/locking/lockdep.c:4456 mark_usage kernel/locking/lockdep.c:4399 [inline] __lock_acquire+0x89d/0x54c0 kernel/locking/lockdep.c:4854 lock_acquire kernel/locking/lockdep.c:5510 [inline] lock_acquire+0x1ab/0x730 kernel/locking/lockdep.c:5475 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:159 __debug_check_no_obj_freed lib/debugobjects.c:975 [inline] debug_check_no_obj_freed+0xc7/0x420 lib/debugobjects.c:1018 slab_free_hook mm/slub.c:1554 [inline] slab_free_freelist_hook+0xd6/0x1b0 mm/slub.c:1600 slab_free mm/slub.c:3161 [inline] kfree+0xe5/0x7b0 mm/slub.c:4213 skb_free_head net/core/skbuff.c:650 [inline] skb_release_data+0x622/0x750 net/core/skbuff.c:671 skb_release_all net/core/skbuff.c:725 [inline] __kfree_skb net/core/skbuff.c:739 [inline] kfree_skb net/core/skbuff.c:757 [inline] kfree_skb+0x133/0x3f0 net/core/skbuff.c:751 __netif_receive_skb_core+0x821/0x37f0 net/core/dev.c:5339 __netif_receive_skb_one_core+0xae/0x180 net/core/dev.c:5363 __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5479 process_backlog+0x232/0x6c0 net/core/dev.c:6346 __napi_poll+0xaf/0x440 net/core/dev.c:6892 napi_poll net/core/dev.c:6959 [inline] net_rx_action+0x801/0xb40 net/core/dev.c:7036 __do_softirq+0x29b/0x9f6 kernel/softirq.c:345 do_softirq.part.0+0xc8/0x110 kernel/softirq.c:248 do_softirq kernel/softirq.c:240 [inline] __local_bh_enable_ip+0x102/0x120 kernel/softirq.c:198 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:745 [inline] __dev_queue_xmit+0x1b71/0x2e00 net/core/dev.c:4209 batadv_send_skb_packet+0x4a9/0x5f0 net/batman-adv/send.c:108 batadv_iv_ogm_send_to_if net/batman-adv/bat_iv_ogm.c:393 [inline] batadv_iv_ogm_emit net/batman-adv/bat_iv_ogm.c:419 [inline] batadv_iv_send_outstanding_bat_ogm_packet+0x781/0x920 net/batman-adv/bat_iv_ogm.c:1711 process_one_work+0x98d/0x1600 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294