bridge0: port 2(bridge_slave_1) entered disabled state bridge_slave_0: left allmulticast mode bridge_slave_0: left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state Oops: general protection fault, probably for non-canonical address 0xdffffc0000000021: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000108-0x000000000000010f] CPU: 0 UID: 0 PID: 6857 Comm: kworker/u32:24 Not tainted 6.15.0-syzkaller-10954-gd00a83477e7a #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: netns cleanup_net RIP: 0010:read_pnet include/net/net_namespace.h:409 [inline] RIP: 0010:dev_net include/linux/netdevice.h:2713 [inline] RIP: 0010:__igmp_group_dropped+0xcd/0xe80 net/ipv4/igmp.c:1298 Code: 3c 02 00 0f 85 10 0c 00 00 4d 8b 2c 24 e8 cb 5b 80 01 48 b8 00 00 00 00 00 fc ff df 49 8d bd 08 01 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 db 0b 00 00 48 8d bb db 00 00 00 4d 8b bd 08 01 RSP: 0018:ffffc9000408f5d8 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff888062ee0600 RCX: ffffffff89fda2e7 RDX: 0000000000000021 RSI: ffffffff89fd05dc RDI: 0000000000000108 RBP: 1ffff92000811ebe R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: ffff888053fdf000 R13: 0000000000000000 R14: 0000000000000001 R15: ffff88802bef0418 FS: 0000000000000000(0000) GS:ffff8880d6765000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000000 CR3: 000000000e382000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: igmp_group_dropped net/ipv4/igmp.c:1335 [inline] ip_mc_down+0xc0/0x3c0 net/ipv4/igmp.c:1829 inetdev_event+0x3b2/0x18a0 net/ipv4/devinet.c:1642 notifier_call_chain+0xbc/0x410 kernel/notifier.c:85 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230 call_netdevice_notifiers_extack net/core/dev.c:2268 [inline] call_netdevice_notifiers net/core/dev.c:2282 [inline] dev_close_many+0x319/0x630 net/core/dev.c:1785 unregister_netdevice_many_notify+0x578/0x26f0 net/core/dev.c:12046 ops_exit_rtnl_list net/core/net_namespace.c:188 [inline] ops_undo_list+0x8fc/0xab0 net/core/net_namespace.c:249 cleanup_net+0x408/0x890 net/core/net_namespace.c:686 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3321 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402 kthread+0x3c5/0x780 kernel/kthread.c:464 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:read_pnet include/net/net_namespace.h:409 [inline] RIP: 0010:dev_net include/linux/netdevice.h:2713 [inline] RIP: 0010:__igmp_group_dropped+0xcd/0xe80 net/ipv4/igmp.c:1298 Code: 3c 02 00 0f 85 10 0c 00 00 4d 8b 2c 24 e8 cb 5b 80 01 48 b8 00 00 00 00 00 fc ff df 49 8d bd 08 01 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 db 0b 00 00 48 8d bb db 00 00 00 4d 8b bd 08 01 RSP: 0018:ffffc9000408f5d8 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff888062ee0600 RCX: ffffffff89fda2e7 RDX: 0000000000000021 RSI: ffffffff89fd05dc RDI: 0000000000000108 RBP: 1ffff92000811ebe R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: ffff888053fdf000 R13: 0000000000000000 R14: 0000000000000001 R15: ffff88802bef0418 FS: 0000000000000000(0000) GS:ffff8880d6965000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000003233b000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 3c 02 cmp $0x2,%al 2: 00 0f add %cl,(%rdi) 4: 85 10 test %edx,(%rax) 6: 0c 00 or $0x0,%al 8: 00 4d 8b add %cl,-0x75(%rbp) b: 2c 24 sub $0x24,%al d: e8 cb 5b 80 01 call 0x1805bdd 12: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 19: fc ff df 1c: 49 8d bd 08 01 00 00 lea 0x108(%r13),%rdi 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 db 0b 00 00 jne 0xc0f 34: 48 8d bb db 00 00 00 lea 0xdb(%rbx),%rdi 3b: 4d rex.WRB 3c: 8b .byte 0x8b 3d: bd .byte 0xbd 3e: 08 01 or %al,(%rcx)