------------[ cut here ]------------
WARNING: CPU: 0 PID: 4293 at kernel/workqueue.c:1441 __queue_work+0xddc/0xf90 kernel/workqueue.c:-1
Modules linked in:
CPU: 0 PID: 4293 Comm: kworker/u4:5 Not tainted 6.1.134-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: netns cleanup_net
RIP: 0010:__queue_work+0xddc/0xf90 kernel/workqueue.c:1441
Code: 8b 3c 24 e8 46 42 88 00 e9 d9 fc ff ff e8 dc e2 30 00 89 ee 48 c7 c7 20 c6 1d 8d e8 ce 0b 15 03 e9 1e fc ff ff e8 c4 e2 30 00 <0f> 0b 48 83 c4 50 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 ae e2 30 00
RSP: 0018:ffffc90000007af8 EFLAGS: 00010046
RAX: ffffffff815969dc RBX: 00000000000b0012 RCX: ffff88802f7b1dc0
RDX: 0000000000000100 RSI: 0000000000000100 RDI: 0000000000000000
RBP: 0000000000010000 R08: ffffffff815a5675 R09: fffffbfff1d417a6
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: dffffc0000000000 R14: 0000000000000008 R15: ffff888026b7a000
FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f02eeae7d60 CR3: 0000000053b57000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
call_timer_fn+0x1ad/0x6b0 kernel/time/timer.c:1504
expire_timers kernel/time/timer.c:1544 [inline]
__run_timers+0x6a8/0x890 kernel/time/timer.c:1820
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1833
handle_softirqs+0x2ee/0xa40 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0x157/0x240 kernel/softirq.c:661
irq_exit_rcu+0x5/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:detach_rules net/core/fib_rules.c:1232 [inline]
RIP: 0010:fib_rules_event+0x94e/0xbe0 net/core/fib_rules.c:1265
Code: 08 49 c1 ef 03 4c 89 3c 24 48 89 6c 24 18 4c 8d 7d 78 4c 89 f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 a5 a5 29 f9 4d 8b 27 <4d> 39 fc 0f 84 db 01 00 00 4d 8d 74 24 10 4d 89 f5 49 c1 ed 03 41
RSP: 0018:ffffc900043d7850 EFLAGS: 00000246
RAX: 1ffff1100f6f2cb0 RBX: dffffc0000000000 RCX: ffff88802f7b1dc0
RDX: 0000000000000000 RSI: 000000000000000a RDI: 0000000000000000
RBP: ffff88807b796508 R08: ffffffff88b8072a R09: ffffffff88b7fdcc
R10: 0000000000000003 R11: ffff88802f7b1dc0 R12: ffff888029576e00
R13: ffff888029576914 R14: 1ffff110052aed22 R15: ffff88807b796580
notifier_call_chain kernel/notifier.c:87 [inline]
raw_notifier_call_chain+0xd0/0x170 kernel/notifier.c:455
call_netdevice_notifiers_extack net/core/dev.c:2039 [inline]
call_netdevice_notifiers net/core/dev.c:2053 [inline]
unregister_netdevice_many+0xe48/0x1710 net/core/dev.c:10978
ip6gre_exit_batch_net+0x446/0x490 net/ipv6/ip6_gre.c:1669
ops_exit_list net/core/net_namespace.c:177 [inline]
cleanup_net+0x886/0xd20 net/core/net_namespace.c:640
process_one_work+0x917/0x1260 kernel/workqueue.c:2292
worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
----------------
Code disassembly (best guess):
0: 08 49 c1 or %cl,-0x3f(%rcx)
3: ef out %eax,(%dx)
4: 03 4c 89 3c add 0x3c(%rcx,%rcx,4),%ecx
8: 24 48 and $0x48,%al
a: 89 6c 24 18 mov %ebp,0x18(%rsp)
e: 4c 8d 7d 78 lea 0x78(%rbp),%r15
12: 4c 89 f8 mov %r15,%rax
15: 48 c1 e8 03 shr $0x3,%rax
19: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1)
1d: 74 08 je 0x27
1f: 4c 89 ff mov %r15,%rdi
22: e8 a5 a5 29 f9 call 0xf929a5cc
27: 4d 8b 27 mov (%r15),%r12
* 2a: 4d 39 fc cmp %r15,%r12 <-- trapping instruction
2d: 0f 84 db 01 00 00 je 0x20e
33: 4d 8d 74 24 10 lea 0x10(%r12),%r14
38: 4d 89 f5 mov %r14,%r13
3b: 49 c1 ed 03 shr $0x3,%r13
3f: 41 rex.B