Re: [syzbot] WARNING in init_timer_key

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syzbot

unread,
May 9, 2021, 6:55:05 AMMay 9
to duch...@gmail.com, syzkall...@googlegroups.com
Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in init_timer_key

DC ieee80211_runtime_change_iftype: calling ieee80211_setup_sdata
DC ieee80211_setup_sdata: type:(1) memset(sdata->u): ffff8880193c9810
DC ieee80211_ibss_setup_sdata: timer_setup: ffff8880193c9810
------------[ cut here ]------------
ODEBUG: init active (active state 0) object type: timer_list hint: 0x0
WARNING: CPU: 1 PID: 12750 at lib/debugobjects.c:508 debug_print_object lib/debugobjects.c:505 [inline]
WARNING: CPU: 1 PID: 12750 at lib/debugobjects.c:508 __debug_object_init+0x9b7/0x17a0 lib/debugobjects.c:588
Modules linked in:
CPU: 1 PID: 12750 Comm: syz-executor.2 Not tainted 5.12.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:debug_print_object lib/debugobjects.c:505 [inline]
RIP: 0010:__debug_object_init+0x9b7/0x17a0 lib/debugobjects.c:588
Code: 4c 89 ff e8 0b b5 e0 fd 4d 8b 07 48 c7 c7 00 8f 32 8a 48 c7 c6 20 8d 32 8a 48 89 da 44 89 f1 4c 8b 0c 24 31 c0 e8 a9 4f 6a fd <0f> 0b 4c 8b 64 24 28 ff 05 f8 bf 59 09 48 8b 5c 24 60 48 83 c3 18
RSP: 0018:ffffc900096076a0 EFLAGS: 00010246
RAX: 9f5e6e054b9f0e00 RBX: ffffffff8a3290c0 RCX: 9f5e6e054b9f0e00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc900096077e0 R08: ffffffff8160f2b2 R09: ffffed10173e5f90
R10: ffffed10173e5f90 R11: 0000000000000000 R12: ffff8880146fe35c
R13: dffffc0000000000 R14: 0000000000000000 R15: ffffffff89d0d0e0
FS: 00007f51a5acc700(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055bf7b1ac5e0 CR3: 000000004169e000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
debug_timer_init kernel/time/timer.c:722 [inline]
debug_init kernel/time/timer.c:770 [inline]
init_timer_key+0x39/0x110 kernel/time/timer.c:814
ieee80211_ibss_setup_sdata+0x57/0x190 net/mac80211/ibss.c:1735
ieee80211_setup_sdata+0x648/0xc40 net/mac80211/iface.c:1553
ieee80211_runtime_change_iftype net/mac80211/iface.c:1660 [inline]
ieee80211_if_change_type+0x4ca/0x8f0 net/mac80211/iface.c:1682
ieee80211_change_iface+0x40/0x210 net/mac80211/cfg.c:158
rdev_change_virtual_intf net/wireless/rdev-ops.h:69 [inline]
cfg80211_change_iface+0x344/0xba0 net/wireless/util.c:1075
nl80211_set_interface+0x497/0x7f0 net/wireless/nl80211.c:3918
genl_family_rcv_msg_doit net/netlink/genetlink.c:739 [inline]
genl_family_rcv_msg net/netlink/genetlink.c:783 [inline]
genl_rcv_msg+0xe4e/0x1280 net/netlink/genetlink.c:800
netlink_rcv_skb+0x190/0x3a0 net/netlink/af_netlink.c:2502
genl_rcv+0x24/0x40 net/netlink/genetlink.c:811
netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
netlink_unicast+0x786/0x940 net/netlink/af_netlink.c:1338
netlink_sendmsg+0x9ae/0xd50 net/netlink/af_netlink.c:1927
sock_sendmsg_nosec net/socket.c:654 [inline]
sock_sendmsg net/socket.c:674 [inline]
__sys_sendto+0x438/0x5c0 net/socket.c:1977
__do_sys_sendto net/socket.c:1989 [inline]
__se_sys_sendto net/socket.c:1985 [inline]
__x64_sys_sendto+0xda/0xf0 net/socket.c:1985
do_syscall_64+0x3f/0xb0 arch/x86/entry/common.c:47
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4193ec
Code: fa fa ff ff 44 8b 4c 24 2c 4c 8b 44 24 20 89 c5 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 44 24 08 e8 20 fb ff ff 48 8b
RSP: 002b:00007f51a5acaf80 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f51a5acb0f0 RCX: 00000000004193ec
RDX: 0000000000000024 RSI: 00007f51a5acb140 RDI: 0000000000000005
RBP: 0000000000000000 R08: 00007f51a5acafd4 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007f51a5acb140 R14: 0000000000000005 R15: 0000000000000000


Tested on:

commit: b7415964 Merge tag 'riscv-for-linus-5.13-mw1' of git://git..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=137dad69d00000
kernel config: https://syzkaller.appspot.com/x/.config?x=18bd64cc24bc73d5
dashboard link: https://syzkaller.appspot.com/bug?extid=105896fac213f26056f9
compiler: Debian clang version 11.0.1-2
patch: https://syzkaller.appspot.com/x/patch.diff?x=16da6d93d00000

syzbot

unread,
May 9, 2021, 4:24:09 PMMay 9
to duch...@gmail.com, syzkall...@googlegroups.com
Hello,

syzbot tried to test the proposed patch but the build/boot failed:

idge0: port 1(bridge_slave_0) entered blocking state
[ 51.119735][ T8381] bridge0: port 1(bridge_slave_0) entered disabled state
[ 51.129048][ T8381] device bridge_slave_0 entered promiscuous mode
[ 51.138812][ T8381] bridge0: port 2(bridge_slave_1) entered blocking state
[ 51.146495][ T8381] bridge0: port 2(bridge_slave_1) entered disabled state
[ 51.155884][ T8381] device bridge_slave_1 entered promiscuous mode
[ 51.175171][ T8381] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[ 51.187240][ T8381] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[ 51.209511][ T8381] team0: Port device team_slave_0 added
[ 51.216804][ T8381] team0: Port device team_slave_1 added
[ 51.233815][ T8381] batman_adv: batadv0: Adding interface: batadv_slave_0
[ 51.241175][ T8381] batman_adv: batadv0: The MTU of interface batadv_slave_0 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem.
[ 51.268937][ T8381] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[ 51.283578][ T8381] batman_adv: batadv0: Adding interface: batadv_slave_1
[ 51.290714][ T8381] batman_adv: batadv0: The MTU of interface batadv_slave_1 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem.
[ 51.319201][ T8381] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[ 51.345825][ T8381] device hsr_slave_0 entered promiscuous mode
[ 51.354026][ T8381] device hsr_slave_1 entered promiscuous mode
[ 51.446468][ T8381] netdevsim netdevsim0 netdevsim0: renamed from eth0
[ 51.456870][ T8381] netdevsim netdevsim0 netdevsim1: renamed from eth1
[ 51.468545][ T8381] netdevsim netdevsim0 netdevsim2: renamed from eth2
[ 51.477650][ T8381] netdevsim netdevsim0 netdevsim3: renamed from eth3
[ 51.503104][ T8381] bridge0: port 2(bridge_slave_1) entered blocking state
[ 51.510523][ T8381] bridge0: port 2(bridge_slave_1) entered forwarding state
[ 51.518754][ T8381] bridge0: port 1(bridge_slave_0) entered blocking state
[ 51.526074][ T8381] bridge0: port 1(bridge_slave_0) entered forwarding state
[ 51.568723][ T8381] 8021q: adding VLAN 0 to HW filter on device bond0
[ 51.581147][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[ 51.594500][ T5] bridge0: port 1(bridge_slave_0) entered disabled state
[ 51.603544][ T5] bridge0: port 2(bridge_slave_1) entered disabled state
[ 51.612102][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready
[ 51.627246][ T8381] 8021q: adding VLAN 0 to HW filter on device team0
[ 51.638762][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready
[ 51.648107][ T5] bridge0: port 1(bridge_slave_0) entered blocking state
[ 51.655304][ T5] bridge0: port 1(bridge_slave_0) entered forwarding state
[ 51.675869][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready
[ 51.685239][ T7] bridge0: port 2(bridge_slave_1) entered blocking state
[ 51.692559][ T7] bridge0: port 2(bridge_slave_1) entered forwarding state
[ 51.701395][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready
[ 51.710533][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready
[ 51.723265][ T4100] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready
[ 51.740070][ T8381] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network
[ 51.752686][ T8381] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network
[ 51.767670][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready
[ 51.777435][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready
[ 51.786998][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready
[ 51.808929][ T8381] 8021q: adding VLAN 0 to HW filter on device batadv0
[ 51.816625][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready
[ 51.824425][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready
[ 51.842304][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready
[ 51.860098][ T4100] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready
[ 51.869628][ T4100] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready
[ 51.878732][ T4100] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready
[ 51.890288][ T8381] device veth0_vlan entered promiscuous mode
[ 51.903856][ T8381] device veth1_vlan entered promiscuous mode
[ 51.924835][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready
[ 51.933834][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready
[ 51.943614][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready
[ 51.955502][ T8381] device veth0_macvtap entered promiscuous mode
[ 51.967773][ T8381] device veth1_macvtap entered promiscuous mode
[ 51.985936][ T8381] batman_adv: batadv0: Interface activated: batadv_slave_0
[ 51.995174][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready
[ 52.006657][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready
[ 52.019331][ T8381] batman_adv: batadv0: Interface activated: batadv_slave_1
[ 52.027900][ T4100] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
[ 52.040086][ T8381] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[ 52.052122][ T8381] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[ 52.061072][ T8381] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[ 52.071885][ T8381] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[ 52.141748][ T8381] DC ieee80211_if_add: calling ieee80211_setup_sdata
[ 52.149444][ T8381] DC ieee80211_setup_sdata: type:(2) memset(sdata->u): ffff888014605810
[ 52.160113][ T8381] DC ieee80211_sta_setup_sdata: timer_setup: ffff888014605810
[ 52.177218][ T8381] DC cfg80211_change_iface: from otype(2) to ntype(1)
[ 52.184754][ T8381] DC cfg80211_mlme_down:
[ 52.189219][ T8381] DC cfg80211_mlme_down: A
[ 52.194533][ T8381] DC cfg80211_mlme_down: B
[ 52.198969][ T8381] DC cfg80211_mlme_deauth:
[ 52.203906][ T8381] DC cfg80211_mlme_deauth: A
[ 52.208850][ T8381] DC rdev_deauth: ops->deauth
[ 52.214268][ T8381] DC ieee80211_change_iface: type: 1
[ 52.222829][ T8381] DC ieee80211_if_change_type: calling ieee80211_setup_sdata
[ 52.230335][ T8381] DC ieee80211_setup_sdata: type:(1) memset(sdata->u): ffff888014605810
[ 52.238956][ T8381] DC ieee80211_ibss_setup_sdata: timer_setup: ffff888014605810
[ 52.252237][ T73] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[ 52.260198][ T73] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[ 52.267886][ T8381] DC ieee80211_if_add: calling ieee80211_setup_sdata
[ 52.267913][ T8381] DC ieee80211_setup_sdata: type:(2) memset(sdata->u): ffff888030339810
[ 52.267944][ T8381] DC ieee80211_sta_setup_sdata: timer_setup: ffff888030339810
[ 52.278109][ T8381] DC cfg80211_change_iface: from otype(2) to ntype(1)
[ 52.300690][ T8381] DC cfg80211_mlme_down:
[ 52.305206][ T8381] DC cfg80211_mlme_down: A
[ 52.310078][ T8381] DC cfg80211_mlme_down: B
[ 52.315565][ T8381] DC cfg80211_mlme_deauth:
[ 52.326719][ T8381] DC cfg80211_mlme_deauth: A
[ 52.332583][ T8381] DC rdev_deauth: ops->deauth
[ 52.337573][ T8381] DC ieee80211_change_iface: type: 1
[ 52.346861][ T8381] DC ieee80211_if_change_type: calling ieee80211_setup_sdata
[ 52.355459][ T8381] DC ieee80211_setup_sdata: type:(1) memset(sdata->u): ffff888030339810
[ 52.364249][ T8381] DC ieee80211_ibss_setup_sdata: timer_setup: ffff888030339810
[ 52.374642][ T8602] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[ 52.385124][ T73] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[ 52.393441][ T73] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
[ 52.402974][ T8602] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
executing program
2021/05/09 20:22:52 building call list...
[ 52.977375][ T9] arp_tables: DC arpt_unregister_table_pre_exit: name: filter
[ 53.120252][ T9] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[ 54.786721][ T8373] can: request_module (can-proto-0) failed.
executing program
[ 55.408111][ T9] netdevsim netdevsim0 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[ 57.768580][ T9] netdevsim netdevsim0 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[ 57.908120][ T9] netdevsim netdevsim0 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
executing program
[ 59.495887][ T9] DC ieee80211_ibss_leave: del_timer_sync: ffff888030339810
[ 59.656666][ T9] DC ieee80211_ibss_leave: del_timer_sync: ffff888014605810
[ 59.846771][ T9] device hsr_slave_0 left promiscuous mode
[ 59.853643][ T9] device hsr_slave_1 left promiscuous mode
[ 59.862899][ T9] batman_adv: batadv0: Interface deactivated: batadv_slave_0
[ 59.871107][ T9] batman_adv: batadv0: Removing interface: batadv_slave_0
[ 59.880969][ T9] batman_adv: batadv0: Interface deactivated: batadv_slave_1
[ 59.888723][ T9] batman_adv: batadv0: Removing interface: batadv_slave_1
[ 59.898934][ T9] device bridge_slave_1 left promiscuous mode
[ 59.906707][ T9] bridge0: port 2(bridge_slave_1) entered disabled state
[ 59.918900][ T9] device bridge_slave_0 left promiscuous mode
[ 59.926190][ T9] bridge0: port 1(bridge_slave_0) entered disabled state
[ 59.943466][ T9] device veth1_macvtap left promiscuous mode
[ 59.950940][ T9] device veth0_macvtap left promiscuous mode
[ 59.957492][ T9] device veth1_vlan left promiscuous mode
[ 59.964474][ T9] device veth0_vlan left promiscuous mode
executing program
[ 63.264654][ T9] team0 (unregistering): Port device team_slave_1 removed
[ 63.278487][ T9] team0 (unregistering): Port device team_slave_0 removed
[ 63.293924][ T9] bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
[ 63.307602][ T9] bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
[ 63.355343][ T9] bond0 (unregistering): Released all slaves
[ 64.322038][ T9] ==================================================================
[ 64.330686][ T9] BUG: KASAN: use-after-free in __nf_hook_entries_try_shrink+0x5b8/0x660
[ 64.339544][ T9] Read of size 4 at addr ffff88801dc20a48 by task kworker/u4:0/9
[ 64.347888][ T9]
[ 64.350293][ T9] CPU: 1 PID: 9 Comm: kworker/u4:0 Not tainted 5.12.0-syzkaller #0
[ 64.358187][ T9] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 64.368227][ T9] Workqueue: netns cleanup_net
[ 64.373033][ T9] Call Trace:
[ 64.376563][ T9] dump_stack+0x176/0x24e
[ 64.380979][ T9] print_address_description+0x5f/0x3a0
[ 64.386515][ T9] kasan_report+0x15c/0x200
[ 64.391000][ T9] ? __nf_hook_entries_try_shrink+0x2d0/0x660
[ 64.397048][ T9] ? __nf_hook_entries_try_shrink+0x5b8/0x660
[ 64.403110][ T9] __nf_hook_entries_try_shrink+0x5b8/0x660
[ 64.408996][ T9] __nf_unregister_net_hook+0x47b/0x680
[ 64.414548][ T9] cleanup_net+0x708/0xbd0
[ 64.418977][ T9] process_one_work+0x789/0xfd0
[ 64.423915][ T9] worker_thread+0xac1/0x1300
[ 64.428956][ T9] ? rcu_lock_release+0x20/0x20
[ 64.433791][ T9] kthread+0x39a/0x3c0
[ 64.437845][ T9] ? rcu_lock_release+0x20/0x20
[ 64.442674][ T9] ? kthread_blkcg+0xd0/0xd0
[ 64.447270][ T9] ret_from_fork+0x1f/0x30
[ 64.451778][ T9]
[ 64.454097][ T9] Allocated by task 8111:
[ 64.458413][ T9] ____kasan_kmalloc+0xc4/0xf0
[ 64.463680][ T9] kmem_cache_alloc_trace+0x96/0x340
[ 64.468978][ T9] kernfs_fop_open+0x909/0xbd0
[ 64.473830][ T9] do_dentry_open+0x7cb/0x1010
[ 64.478751][ T9] path_openat+0x27c9/0x3860
[ 64.483338][ T9] do_filp_open+0x1a3/0x3b0
[ 64.488202][ T9] do_sys_openat2+0xba/0x380
[ 64.492817][ T9] __x64_sys_open+0x1af/0x1e0
[ 64.497589][ T9] do_syscall_64+0x3f/0xb0
[ 64.502252][ T9] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 64.508231][ T9]
[ 64.510848][ T9] Freed by task 9:
[ 64.514704][ T9] kasan_set_track+0x3d/0x70
[ 64.519294][ T9] kasan_set_free_info+0x1f/0x40
[ 64.524318][ T9] ____kasan_slab_free+0x109/0x150
[ 64.529597][ T9] slab_free_freelist_hook+0x1d8/0x290
[ 64.535341][ T9] kfree+0xcf/0x2d0
[ 64.539158][ T9] xt_unregister_table+0x211/0x2c0
[ 64.544254][ T9] arpt_unregister_table+0x78/0x3f0
[ 64.549438][ T9] cleanup_net+0x708/0xbd0
[ 64.554012][ T9] process_one_work+0x789/0xfd0
[ 64.559059][ T9] worker_thread+0xac1/0x1300
[ 64.563728][ T9] kthread+0x39a/0x3c0
[ 64.567783][ T9] ret_from_fork+0x1f/0x30
[ 64.572182][ T9]
[ 64.574718][ T9] The buggy address belongs to the object at ffff88801dc20a00
[ 64.574718][ T9] which belongs to the cache kmalloc-128 of size 128
[ 64.588932][ T9] The buggy address is located 72 bytes inside of
[ 64.588932][ T9] 128-byte region [ffff88801dc20a00, ffff88801dc20a80)
[ 64.602822][ T9] The buggy address belongs to the page:
[ 64.608624][ T9] page:ffffea0000770800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1dc20
[ 64.618851][ T9] flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
[ 64.626911][ T9] raw: 00fff00000000200 ffffea00004ff980 0000000400000004 ffff8880100418c0
[ 64.635570][ T9] raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
[ 64.644154][ T9] page dumped because: kasan: bad access detected
[ 64.650584][ T9]
[ 64.652929][ T9] Memory state around the buggy address:
[ 64.658948][ T9] ffff88801dc20900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
executing program
[ 64.667035][ T9] ffff88801dc20980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 64.675094][ T9] >ffff88801dc20a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 64.683482][ T9] ^
[ 64.690068][ T9] ffff88801dc20a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 64.698380][ T9] ffff88801dc20b00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 64.706821][ T9] ==================================================================
[ 64.715393][ T9] Disabling lock debugging due to kernel taint
[ 64.722097][ T9] Kernel panic - not syncing: panic_on_warn set ...
[ 64.728789][ T9] CPU: 1 PID: 9 Comm: kworker/u4:0 Tainted: G B 5.12.0-syzkaller #0
[ 64.738245][ T9] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 64.748730][ T9] Workqueue: netns cleanup_net
[ 64.753485][ T9] Call Trace:
[ 64.756748][ T9] dump_stack+0x176/0x24e
[ 64.761157][ T9] panic+0x291/0x800
[ 64.765043][ T9] ? trace_hardirqs_on+0x30/0x80
[ 64.770166][ T9] kasan_report+0x1ff/0x200
[ 64.774749][ T9] ? __nf_hook_entries_try_shrink+0x2d0/0x660
[ 64.781060][ T9] ? __nf_hook_entries_try_shrink+0x5b8/0x660
[ 64.787200][ T9] __nf_hook_entries_try_shrink+0x5b8/0x660
[ 64.793168][ T9] __nf_unregister_net_hook+0x47b/0x680
[ 64.798696][ T9] cleanup_net+0x708/0xbd0
[ 64.803132][ T9] process_one_work+0x789/0xfd0
[ 64.808073][ T9] worker_thread+0xac1/0x1300
[ 64.812840][ T9] ? rcu_lock_release+0x20/0x20
[ 64.817673][ T9] kthread+0x39a/0x3c0
[ 64.821722][ T9] ? rcu_lock_release+0x20/0x20
[ 64.826922][ T9] ? kthread_blkcg+0xd0/0xd0
[ 64.831592][ T9] ret_from_fork+0x1f/0x30
[ 64.837627][ T9] Kernel Offset: disabled
[ 64.842033][ T9] Rebooting in 86400 seconds..


Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=17dc7fedd00000


Tested on:

commit: b7415964 Merge tag 'riscv-for-linus-5.13-mw1' of git://git..
git tree: upstream
patch: https://syzkaller.appspot.com/x/patch.diff?x=12107779d00000

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