INFO: task syz-executor:27940 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:22440 pid:27940 tgid:27940 ppid:1      task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17db/0x58f0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7c1/0x1550
 del_device_store+0xd6/0x370
 kernfs_fop_write_iter+0x3a4/0x540
 vfs_write+0x612/0xba0
 ksys_write+0x150/0x270
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2ff855ed8e
RSP: 002b:00007ffe5b592c28 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000055555cfa3500 RCX: 00007f2ff855ed8e
RDX: 0000000000000001 RSI: 00007ffe5b592cb0 RDI: 0000000000000005
RBP: 00007f2ff8636174 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe5b592cb0 R14: 00007ffe5b5934f0 R15: 0000000000000003
 </TASK>

Showing all locks held in the system:
locks held by khungtaskd/35: 1, last CPU#1:
 #0: ffffffff8fd5ce60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
locks held by dhcpcd/5340: 1, on CPU#1:
 #0: ffffffff9125ad80 (rtnl_mutex){+.+.}-{4:4}, at: inet6_rtm_deladdr+0x249/0x390
locks held by getty/5423: 2, on CPU#0:
 #0: ffff88816a2850a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000347b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
locks held by kworker/u8:2/5637: 5, on CPU#1:
 #0: ffff8881012d5940 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc90004987c40 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #2: ffffffff9124c508 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf5/0x810
 #3: ffffffff9125ad80 (rtnl_mutex){+.+.}-{4:4}, at: ieee80211_unregister_hw+0x55/0x2c0
 #4: ffffffff912ff300 (flowtable_lock){+.+.}-{4:4}, at: nf_flow_table_cleanup+0x21/0xb0
locks held by kworker/0:4/5658: 6, last CPU#0:
 #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc90004ae7c40 ((debug_obj_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #2: ffffffff8fd5ce60 (rcu_read_lock){....}-{1:3}, at: process_backlog+0x3de/0x18b0
 #3: ffffffff8fd5ce60 (rcu_read_lock){....}-{1:3}, at: NF_HOOK+0x9e/0x3c0
 #4: ffffffff8fd5ce60 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0x8f/0x2550
 #5: ffffffff9ba4d788 (&____s->seqcount#2){----}-{0:0}, at: ktime_get+0x45/0x220
locks held by syz-executor/27871: 7, on CPU#1:
 #0: ffff88816a17e460 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0
 #1: ffff88810d719c80 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1d8/0x540
 #2: ffff88816732ca58 (kn->active#48){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x22b/0x540
 #3: ffffffff90ad2300 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xd6/0x370
 #4: ffff8880268e7128 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xb9/0x880
 #5: ffff8880268e6258 (&devlink->lock_key#5){+.+.}-{4:4}, at: nsim_drv_remove+0x50/0x170
 #6: ffffffff9125ad80 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_dev_lock+0x257/0x2f0
locks held by syz-executor/27940: 4, on CPU#1:
 #0: ffff88816a17e460 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0
 #1: ffff888100b03880 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1d8/0x540
 #2: ffff88816732ca58 (kn->active#48){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x22b/0x540
 #3: ffffffff90ad2300 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xd6/0x370
locks held by syz-executor/27962: 4, on CPU#1:
 #0: ffff88816a17e460 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0
 #1: ffff8881ba8b5480 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1d8/0x540
 #2: ffff88816732ca58 (kn->active#48){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x22b/0x540
 #3: ffffffff90ad2300 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xd6/0x370
locks held by syz-executor/27970: 4, on CPU#1:
 #0: ffff88816a17e460 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0
 #1: ffff888169ae8c80 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1d8/0x540
 #2: ffff88816732ca58 (kn->active#48){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x22b/0x540
 #3: ffffffff90ad2300 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xd6/0x370
locks held by syz-executor/28083: 4, on CPU#1:
 #0: ffff88816a17e460 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0
 #1: ffff888118aba480 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1d8/0x540
 #2: ffff88816732ca58 (kn->active#48){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x22b/0x540
 #3: ffffffff90ad2300 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xd6/0x370
locks held by syz-executor/28154: 4, on CPU#1:
 #0: ffff88816a17e460 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0
 #1: ffff888105ebac80 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1d8/0x540
 #2: ffff88816732ca58 (kn->active#48){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x22b/0x540
 #3: ffffffff90ad2300 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xd6/0x370
locks held by syz-executor/28175: 4, on CPU#1:
 #0: ffff88816a17e460 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0
 #1: ffff888182f92480 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1d8/0x540
 #2: ffff88816732ca58 (kn->active#48){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x22b/0x540
 #3: ffffffff90ad2300 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xd6/0x370
locks held by syz-executor/28272: 4, on CPU#1:
 #0: ffff88816a17e460 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0
 #1: ffff888182fcf480 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1d8/0x540
 #2: ffff88816732ca58 (kn->active#48){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x22b/0x540
 #3: ffffffff90ad2300 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xd6/0x370
locks held by syz-executor/28303: 1, on CPU#1:
 #0: ffffffff9125ad80 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xc10/0x1c30
locks held by syz-executor/28305: 1, on CPU#1:
 #0: ffffffff9125ad80 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xc10/0x1c30

=============================================

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 35 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17d/0x390
 sys_info+0x135/0x170
 watchdog+0xfd7/0x1030
 kthread+0x38b/0x480
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5658 Comm: kworker/0:4 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: events free_obj_work
RIP: 0010:native_apic_msr_write+0x39/0x50
Code: 74 2a 83 ff 30 74 25 eb 10 81 ff d0 00 00 00 74 1b 81 ff e0 00 00 00 74 13 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 c3 cc cc cc cc cc 89 f6 31 d2 e9 26 f2 ac 03 66 0f 1f 44 00
RSP: 0018:ffffc90000006d30 EFLAGS: 00000046
RAX: 00000000000005e5 RBX: ffff888120e23c80 RCX: 0000000000000838
RDX: 0000000000000000 RSI: 00000000000005e5 RDI: 0000000000000838
RBP: ffffc90000006df0 R08: 0000000000000100 R09: 0000000000000001
R10: 0000000000000003 R11: ffffffff81756510 R12: 00000000000005e5
R13: dffffc0000000000 R14: 0000000010000000 R15: 0000000000000020
FS:  0000000000000000(0000) GS:ffff88818c4ab000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc24c4061d0 CR3: 000000000fb48000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000008d24 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 lapic_next_event+0x11/0x20
 clockevents_program_event+0x385/0x630
 __hrtimer_rearm_deferred+0x36c/0x4b0
 irqentry_exit+0x8d3/0x910
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__dev_queue_xmit+0x2d7c/0x3920
Code: 64 e0 0a 48 c7 c7 60 85 23 8d e8 8f 44 34 02 65 88 1d 83 64 e0 0a 49 bc 00 00 00 00 00 fc ff df 4c 8b 6c 24 18 e9 4f e8 ff ff <e8> 3f c0 0f f8 48 83 7c 24 70 00 0f 84 bd 08 00 00 e8 2e c0 0f f8
RSP: 0018:ffffc90000006f40 EFLAGS: 00000286
RAX: 0000000000000006 RBX: 1ffff11022cbf560 RCX: 0000000000000005
RDX: ffffffff89b8bdaf RSI: ffffffff91251710 RDI: 00000000ffffffff
RBP: ffffc900000071f0 R08: ffff888115100000 R09: 0000000000000006
R10: 0000000000000009 R11: 0000000000000300 R12: 1ffff11035f41e41
R13: ffff8881165fab01 R14: 00000000ffffffff R15: ffff888115101950
 ip_finish_output2+0xbda/0x10b0
 ip_output+0x29f/0x450
 synproxy_send_client_synack+0x89b/0xde0
 nft_synproxy_eval_v4+0x362/0x4e0
 nft_synproxy_do_eval+0x389/0x5d0
 nft_do_chain+0x132b/0x1b10
 nft_do_chain_ipv4+0x195/0x290
 nf_hook_slow+0xc5/0x220
 NF_HOOK+0x21f/0x3c0
 NF_HOOK+0x336/0x3c0
 process_backlog+0xa6b/0x18b0
 __napi_poll+0xaa/0x330
 net_rx_action+0x61d/0xf50
 handle_softirqs+0x226/0x860
 __irq_exit_rcu+0xcb/0x220
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__schedule+0x17c/0x58f0
Code: 08 48 8d 58 20 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 53 f6 4f f6 48 8b 1b 48 89 d8 48 c1 e8 03 42 80 3c 28 00 <74> 08 48 89 df e8 3a f6 4f f6 48 81 3b 9d 6e ac 57 0f 85 51 1d 00
RSP: 0018:ffffc90004ae7200 EFLAGS: 00000246
RAX: 1ffff9200095c000 RBX: ffffc90004ae0000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8c6e1760 RDI: ffffffff8c6e1720
RBP: ffffc90004ae73f8 R08: ffffffff917ac17f R09: 1ffffffff22f582f
R10: dffffc0000000000 R11: fffffbfff22f5830 R12: 0000000000000001
R13: dffffc0000000000 R14: 1ffff9200095ce64 R15: ffff88818c4ab000
 preempt_schedule_irq+0x4b/0x90
 irqentry_exit+0x14f/0x910
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_release+0x2e1/0x3c0
Code: 88 f3 12 00 00 00 00 eb b5 e8 6b d9 48 0a f7 c3 00 02 00 00 74 b9 65 48 8b 05 03 44 f3 12 48 3b 44 24 28 75 48 fb 48 83 c4 30 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 38 f3 d9
RSP: 0018:ffffc90004ae7528 EFLAGS: 00000286
RAX: ab2666030481c200 RBX: 0000000000000206 RCX: 0000000000000046
RDX: ffffc90004ae7601 RSI: ffffffff8e6f7641 RDI: ffffffff8c6e1780
RBP: ffff888115100c00 R08: ffffc90004ae7740 R09: 0000000000000000
R10: ffffc90004ae7658 R11: fffff5200095cecd R12: 0000000000000002
R13: 0000000000000002 R14: ffffffff8fd5ce60 R15: ffff888115100000
 unwind_next_frame+0x1baa/0x2550
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x40/0x50
 __kasan_slab_free+0x5c/0x80
 kmem_cache_free+0x182/0x650
 free_obj_work+0x357/0x490
 process_scheduled_works+0xc3d/0x1630
 worker_thread+0xa47/0xfb0
 kthread+0x38b/0x480
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
