possible deadlock in ieee80211_change

ID	Workflow	Result	Correct	Bug	Created	Started	Finished	Revision	Error
f9d61d77-1899-4a44-8927-9c8194e98d7a	assessment-security	DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌	❓	possible deadlock in ieee80211_change_mac (4)	2026/05/31 03:21	2026/05/31 03:21	2026/05/31 04:17	6b4a844333e83556da95d61d7f207e7ef5cd4bc6
4e6ffa98-4cd4-402e-a3ae-63acc91eaef8	assessment-security		💥	possible deadlock in ieee80211_change_mac (4)	2026/05/14 13:50	2026/05/14 13:50	2026/05/14 13:51	6ccb967e465e832a7bfd7a116ad00d52a0923a5d	failed to run ["git" "pull" "origin" "HEAD" "--depth=1" "--allow-unrelated-histories"]: exit status 128 From /app/workdir/repo/linux * branch HEAD -> FETCH_HEAD Updating files: ... truncated to first 200 bytes; open job for full error

Title	Replies (including bot)	Last reply
[syzbot] [wireless?] possible deadlock in ieee80211_change_mac (4)	0 (1)	2026/02/27 06:40

Title

Replies (including bot)

Last reply

[syzbot] [wireless?] possible deadlock in ieee80211_change_mac (4)

0 (1)

2026/02/27 06:40

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	possible deadlock in ieee80211_change_mac (3) wireless	4	C	error	error	851	448d	459d	0/29	auto-obsoleted due to no activity on 2025/07/17 05:47
upstream	possible deadlock in ieee80211_change_mac (2) wireless	4				1	620d	620d	0/29	auto-obsoleted due to no activity on 2025/01/12 00:37
upstream	possible deadlock in ieee80211_change_mac wireless	4				1	982d	978d	25/29	fixed on 2023/12/21 01:43

Rank 🛈

upstream

possible deadlock in ieee80211_change_mac (3) wireless

error

851

448d

459d

0/29

auto-obsoleted due to no activity on 2025/07/17 05:47

upstream

possible deadlock in ieee80211_change_mac (2) wireless

620d

0/29

auto-obsoleted due to no activity on 2025/01/12 00:37

upstream

possible deadlock in ieee80211_change_mac wireless

982d

978d

25/29

fixed on 2023/12/21 01:43

====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.0.4107/21056 is trying to acquire lock: ffff888055af0788 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: class_wiphy_constructor include/net/cfg80211.h:6441 [inline] ffff888055af0788 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: ieee80211_change_mac+0xb5/0x1410 net/mac80211/iface.c:324 but task is already holding lock: ffffffff8fbc12b0 (dev_addr_sem){++++}-{4:4}, at: do_setlink+0x806/0x4590 net/core/rtnetlink.c:3105 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (dev_addr_sem){++++}-{4:4}: down_read+0x47/0x2e0 kernel/locking/rwsem.c:1537 address_show+0x25/0x250 net/core/net-sysfs.c:266 dev_attr_show+0x58/0xc0 drivers/base/core.c:2421 sysfs_kf_seq_show+0x310/0x490 fs/sysfs/file.c:65 seq_read_iter+0x4ef/0xe10 fs/seq_file.c:231 new_sync_read fs/read_write.c:493 [inline] vfs_read+0x582/0xa70 fs/read_write.c:574 ksys_read+0x150/0x270 fs/read_write.c:717 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (kn->active#13){++++}-{0:0}: kernfs_drain+0x284/0x600 fs/kernfs/dir.c:511 __kernfs_remove+0x3cf/0x660 fs/kernfs/dir.c:1513 kernfs_remove_by_name_ns+0xaf/0x130 fs/kernfs/dir.c:1722 kernfs_remove_by_name include/linux/kernfs.h:633 [inline] remove_files fs/sysfs/group.c:28 [inline] sysfs_remove_group+0xfc/0x2e0 fs/sysfs/group.c:328 sysfs_remove_groups+0x54/0xb0 fs/sysfs/group.c:352 device_remove_groups drivers/base/core.c:2843 [inline] device_remove_attrs+0x229/0x280 drivers/base/core.c:2979 device_del+0x51f/0x8f0 drivers/base/core.c:3877 unregister_netdevice_many_notify+0x1e0e/0x2370 net/core/dev.c:12438 unregister_netdevice_many net/core/dev.c:12466 [inline] unregister_netdevice_queue+0x31f/0x360 net/core/dev.c:12280 unregister_netdevice include/linux/netdevice.h:3408 [inline] _cfg80211_unregister_wdev+0x155/0x570 net/wireless/core.c:1297 ieee80211_remove_interfaces+0x49c/0x6d0 net/mac80211/iface.c:2440 ieee80211_unregister_hw+0x5d/0x2c0 net/mac80211/main.c:1691 mac80211_hwsim_del_radio+0x28a/0x490 drivers/net/wireless/virtual/mac80211_hwsim.c:5916 remove_user_radios drivers/net/wireless/virtual/mac80211_hwsim.c:6727 [inline] mac80211_hwsim_netlink_notify+0xfae/0x1310 drivers/net/wireless/virtual/mac80211_hwsim.c:6741 notifier_call_chain+0x1be/0x400 kernel/notifier.c:85 blocking_notifier_call_chain+0x6a/0x90 kernel/notifier.c:380 netlink_release+0x123b/0x1ad0 net/netlink/af_netlink.c:761 __sock_release net/socket.c:662 [inline] sock_close+0xc3/0x240 net/socket.c:1455 __fput+0x44f/0xa70 fs/file_table.c:469 task_work_run+0x1d9/0x270 kernel/task_work.c:233 get_signal+0x11eb/0x1330 kernel/signal.c:2807 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline] do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&rdev->wiphy.mtx){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x15a5/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/mutex.c:614 [inline] __mutex_lock+0x19f/0x1300 kernel/locking/mutex.c:776 class_wiphy_constructor include/net/cfg80211.h:6441 [inline] ieee80211_change_mac+0xb5/0x1410 net/mac80211/iface.c:324 netif_set_mac_address+0x317/0x4e0 net/core/dev.c:9989 do_setlink+0x9b1/0x4590 net/core/rtnetlink.c:3110 rtnl_changelink net/core/rtnetlink.c:3776 [inline] __rtnl_newlink net/core/rtnetlink.c:3935 [inline] rtnl_newlink+0x15a9/0x1be0 net/core/rtnetlink.c:4072 rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6958 netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0xa68/0xad0 net/socket.c:2592 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2681 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: &rdev->wiphy.mtx --> kn->active#13 --> dev_addr_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(dev_addr_sem); lock(kn->active#13); lock(dev_addr_sem); lock(&rdev->wiphy.mtx); *** DEADLOCK *** 2 locks held by syz.0.4107/21056: #0: ffffffff8fbcb808 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline] #0: ffffffff8fbcb808 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline] #0: ffffffff8fbcb808 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8a1/0x1be0 net/core/rtnetlink.c:4071 #1: ffffffff8fbc12b0 (dev_addr_sem){++++}-{4:4}, at: do_setlink+0x806/0x4590 net/core/rtnetlink.c:3105 stack backtrace: CPU: 0 UID: 0 PID: 21056 Comm: syz.0.4107 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: <TASK> dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_circular_bug+0x2e1/0x300 kernel/locking/lockdep.c:2043 check_noncircular+0x12e/0x150 kernel/locking/lockdep.c:2175 check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x15a5/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/mutex.c:614 [inline] __mutex_lock+0x19f/0x1300 kernel/locking/mutex.c:776 class_wiphy_constructor include/net/cfg80211.h:6441 [inline] ieee80211_change_mac+0xb5/0x1410 net/mac80211/iface.c:324 netif_set_mac_address+0x317/0x4e0 net/core/dev.c:9989 do_setlink+0x9b1/0x4590 net/core/rtnetlink.c:3110 rtnl_changelink net/core/rtnetlink.c:3776 [inline] __rtnl_newlink net/core/rtnetlink.c:3935 [inline] rtnl_newlink+0x15a9/0x1be0 net/core/rtnetlink.c:4072 rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6958 netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0xa68/0xad0 net/socket.c:2592 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2681 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f909439c629 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f90951b3028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f9094616090 RCX: 00007f909439c629 RDX: 0000000000000000 RSI: 0000200000000080 RDI: 0000000000000004 RBP: 00007f9094432b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9094616128 R14: 00007f9094616090 R15: 00007fff601b4778 </TASK> netlink: 8 bytes leftover after parsing attributes in process `syz.0.4107'. netlink: 'syz.0.4107': attribute type 5 has an invalid length. netlink: 20 bytes leftover after parsing attributes in process `syz.0.4107'. geneve2: entered promiscuous mode geneve2: entered allmulticast mode

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/02/23 06:35	net	d4f687fbbce4	6e7b5511	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci-upstream-net-this-kasan-gce	possible deadlock in ieee80211_change_mac

Crashes (1):

Assets (help?)