INFO: task syz-executor:16910 blocked for more than 145 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:22504 pid:16910 tgid:16910 ppid:1      task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7bf/0x1550
 del_device_store+0xd6/0x370
 kernfs_fop_write_iter+0x3a4/0x540
 vfs_write+0x612/0xba0
 ksys_write+0x150/0x270
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f675ad5e84e
RSP: 002b:00007ffd7d8f21e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000055556d5d3500 RCX: 00007f675ad5e84e
RDX: 0000000000000001 RSI: 00007ffd7d8f2270 RDI: 0000000000000005
RBP: 00007f675ae3588f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffd7d8f2270 R14: 00007f675bb54620 R15: 0000000000000003
 </TASK>
INFO: task syz-executor:16920 blocked for more than 146 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:23344 pid:16920 tgid:16920 ppid:16903  task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7bf/0x1550
 del_device_store+0xd6/0x370
 kernfs_fop_write_iter+0x3a4/0x540
 vfs_write+0x612/0xba0
 ksys_write+0x150/0x270
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f229d15e84e
RSP: 002b:00007ffc1b53fb58 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000055557f5a6500 RCX: 00007f229d15e84e
RDX: 0000000000000001 RSI: 00007ffc1b53fbe0 RDI: 0000000000000005
RBP: 00007f229d23588f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffc1b53fbe0 R14: 00007f229df54620 R15: 0000000000000003
 </TASK>

Showing all locks held in the system:
5 locks held by kworker/0:0/9:
 #0: ffff88812103b160 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2d/0x160
 #1: ffff888121024440 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x57/0x7d0
 #2: ffff888102eb2850 (&p->pi_lock){-.-.}-{2:2}, at: try_to_wake_up+0x67/0x14d0
 #3: ffffffff8eb59c60 (rcu_read_lock){....}-{1:3}, at: ip6_input+0x23/0x270
 #4: ffffffff8eb59c60 (rcu_read_lock){....}-{1:3}, at: NF_HOOK+0x9e/0x3c0
1 lock held by khungtaskd/34:
 #0: ffffffff8eb59c60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by kswapd1/93:
3 locks held by kworker/1:2/799:
 #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc9000498fc40 (deferred_process_work){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffffffff9002dec0 (rtnl_mutex){+.+.}-{4:4}, at: switchdev_deferred_process_work+0xe/0x20
3 locks held by kworker/u10:6/1113:
 #0: ffff8881000ac140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc90006c17c40 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffffffff9002dec0 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60
1 lock held by klogd/5046:
5 locks held by udevd/5057:
2 locks held by getty/5432:
 #0: ffff8881121d00a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034732e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
1 lock held by syz-executor/5597:
3 locks held by kworker/u8:5/15095:
 #0: ffff88810eeff140 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc9000176fc40 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffffffff9002dec0 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_verify_work+0x19/0x30
6 locks held by kworker/u8:10/15103:
 #0: ffff8881012d5940 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc900034cfc40 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffffffff9001f328 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf5/0x810
 #3: ffff8881702d0128 (&dev->mutex){....}-{4:4}, at: devlink_pernet_pre_exit+0x129/0x420
 #4: ffff88816ee7d258 (&devlink->lock_key#15){+.+.}-{4:4}, at: devlink_pernet_pre_exit+0x142/0x420
 #5: ffffffff9002dec0 (rtnl_mutex){+.+.}-{4:4}, at: unregister_netdevice_notifier_net+0x87/0x2f0
8 locks held by syz-executor/16908:
 #0: ffff888112c7a450 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0
 #1: ffff88811306bc80 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1d8/0x540
 #2: ffff88816e511e18 (kn->active#48){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x22b/0x540
 #3: ffffffff8f8a9d00 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xd6/0x370
 #4: ffff888116ade128 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xb9/0x880
 #5: ffff8881134d5258 (&devlink->lock_key#7){+.+.}-{4:4}, at: nsim_drv_remove+0x50/0x170
 #6: ffffffff9002dec0 (rtnl_mutex){+.+.}-{4:4}, at: nsim_destroy+0x173/0x800
 #7: ffffffff8eb5ff68 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770
4 locks held by syz-executor/16910:
 #0: ffff888112c7a450 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0
 #1: ffff8881bb374080 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1d8/0x540
 #2: ffff88816e511e18 (kn->active#48){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x22b/0x540
 #3: ffffffff8f8a9d00 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xd6/0x370
4 locks held by syz-executor/16920:
 #0: ffff888112c7a450 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0
 #1: ffff88810f752c80 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1d8/0x540
 #2: ffff88816e511e18 (kn->active#48){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x22b/0x540
 #3: ffffffff8f8a9d00 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xd6/0x370
1 lock held by syz-executor/17011:
2 locks held by dhcpcd-run-hook/17012:
2 locks held by syz-executor/17013:
3 locks held by udevd/17014:

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 34 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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+0x17a/0x380
 sys_info+0x135/0x170
 watchdog+0xfd7/0x1030
 kthread+0x388/0x470
 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: 5046 Comm: klogd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:unwind_next_frame+0xcbc/0x2550
Code: c0 20 c8 3c 01 0f 85 76 0e 00 00 48 89 d7 e8 eb 23 00 00 48 89 c3 49 bc 00 00 00 00 00 fc ff df 48 8b 44 24 20 42 80 3c 20 00 <4d> 8d 7e 48 74 08 4c 89 ff e8 36 10 bd 00 49 89 1f 48 8b 44 24 38
RSP: 0018:ffffc90000006e60 EFLAGS: 00000246
RAX: 1ffff92000000dea RBX: ffffffff8bd12c66 RCX: 1ffff92000000d01
RDX: ffffc90000007ff0 RSI: 0000000000000002 RDI: ffffc90000007ff0
RBP: 1ffffffff21df234 R08: ffffc90000007ff8 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8eb59c60 R12: dffffc0000000000
R13: ffffc90000008000 R14: ffffc90000006f08 R15: ffffc90000000000
FS:  00007f5d54588380(0000) GS:ffff88818d94b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa822455ff8 CR3: 00000001131ce000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 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
 kfree+0x1c5/0x640
 skb_release_data+0x85e/0xab0
 __kfree_skb+0x5d/0x210
 nft_synproxy_eval_v6+0x36a/0x4e0
 nft_synproxy_do_eval+0x3d1/0x550
 nft_do_chain+0x48d/0x1b10
 nft_do_chain_inet+0x360/0x4b0
 nf_hook_slow+0xc5/0x220
 NF_HOOK+0x21f/0x3c0
 ip6_input+0x16a/0x270
 NF_HOOK+0x336/0x3c0
 process_backlog+0x774/0x1860
 __napi_poll+0xaa/0x330
 net_rx_action+0x61d/0xf50
 handle_softirqs+0x225/0x840
 __irq_exit_rcu+0xca/0x220
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_acquire+0x221/0x350
Code: ff ff ff e8 e1 6e 2e 0a f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 cb 89 ca 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d b8 65 b8
RSP: 0018:ffffc9000319f560 EFLAGS: 00000286
RAX: e5bd402a8def6400 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 00000000e98581c4 RSI: ffffffff8e4b4175 RDI: ffffffff8c4bdd80
RBP: ffffffff82404e12 R08: ffffffff82404e12 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8eb59c60 R12: 0000000000000002
R13: ffffffff8eb59c60 R14: 0000000000000000 R15: 0000000000000246
 page_ext_get+0x3e/0x2e0
 __reset_page_owner+0x28/0x1f0
 __free_frozen_pages+0xc1e/0xd10
 __slab_free+0x274/0x2c0
 qlist_free_all+0x99/0x100
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 kmem_cache_alloc_node_noprof+0x355/0x610
 __alloc_skb+0x1d7/0x7a0
 alloc_skb_with_frags+0xc6/0x760
 sock_alloc_send_pskb+0x878/0x990
 unix_dgram_sendmsg+0x4da/0x17b0
 sock_sendmsg_nosec+0x13a/0x180
 __sys_sendto+0x408/0x5a0
 __x64_sys_sendto+0xde/0x100
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5d546ea9b5
Code: 8b 44 24 08 48 83 c4 28 48 98 c3 48 98 c3 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 26 45 31 c9 45 31 c0 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 7a 48 8b 15 44 c4 0c 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffea59f3cd8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f5d546ea9b5
RDX: 000000000000007b RSI: 00005618ca899180 RDI: 0000000000000003
RBP: 00005618ca891910 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000004000 R11: 0000000000000246 R12: 0000000000000013
R13: 00007f5d54878212 R14: 00007ffea59f3dd8 R15: 0000000000000000
 </TASK>
