list_add corruption. next->prev should be prev (ffffffff84cb53a0), but was 0000000000000000. (next=ffff8881ced62c80). ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:25! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 15121 Comm: syz-executor.4 Not tainted 5.4.35-syzkaller-00725-g7f84f8f18418 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__list_add_valid+0xa0/0xc0 lib/list_debug.c:23 Code: 8e 8a 98 84 4c 89 fe 4c 89 e2 4c 89 f1 31 c0 e8 e2 78 2f ff 0f 0b 48 c7 c7 d9 89 98 84 4c 89 e6 4c 89 f1 31 c0 e8 cc 78 2f ff <0f> 0b 48 c7 c7 3c 8a 98 84 4c 89 f6 4c 89 e1 31 c0 e8 b6 78 2f ff RSP: 0018:ffff8881c855f2c8 EFLAGS: 00010246 RAX: 0000000000000075 RBX: ffff8881ced62c88 RCX: 5149f616ba145a00 RDX: ffffc90004413000 RSI: 0000000000004ec6 RDI: 0000000000004ec7 RBP: ffff8881ced62c80 R08: ffffffff812bdcbe R09: ffffed103b705de0 R10: ffffed103b705de0 R11: 0000000000000000 R12: ffffffff84cb53a0 R13: dffffc0000000000 R14: ffff8881ced62c80 R15: ffff8881cb267480 FS: 00007f8ae4c77700(0000) GS:ffff8881db900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fff5b996f28 CR3: 0000000177e4d005 CR4: 00000000001606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __list_add include/linux/list.h:60 [inline] list_add include/linux/list.h:79 [inline] fw_load_sysfs_fallback drivers/base/firmware_loader/fallback.c:515 [inline] fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:580 [inline] firmware_fallback_sysfs+0x48d/0xb30 drivers/base/firmware_loader/fallback.c:654 _request_firmware+0xe82/0x1360 drivers/base/firmware_loader/main.c:783 request_firmware+0x33/0x50 drivers/base/firmware_loader/main.c:826 reg_reload_regdb+0xa6/0x220 net/wireless/reg.c:1083 genl_family_rcv_msg net/netlink/genetlink.c:629 [inline] genl_rcv_msg+0xeef/0x13c0 net/netlink/genetlink.c:654 netlink_rcv_skb+0x200/0x480 net/netlink/af_netlink.c:2478 genl_rcv+0x24/0x40 net/netlink/genetlink.c:665 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x8ad/0xa50 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x9de/0xd80 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg net/socket.c:658 [inline] ____sys_sendmsg+0x58a/0x8d0 net/socket.c:2298 ___sys_sendmsg net/socket.c:2352 [inline] __sys_sendmsg+0x2d5/0x3c0 net/socket.c:2398 do_syscall_64+0xcb/0x150 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c829 Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f8ae4c76c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00000000004fe880 RCX: 000000000045c829 RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000004 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000977 R14: 00000000004d5b40 R15: 00007f8ae4c776d4 Modules linked in: ---[ end trace 8507b6abb056c72e ]--- RIP: 0010:__list_add_valid+0xa0/0xc0 lib/list_debug.c:23 Code: 8e 8a 98 84 4c 89 fe 4c 89 e2 4c 89 f1 31 c0 e8 e2 78 2f ff 0f 0b 48 c7 c7 d9 89 98 84 4c 89 e6 4c 89 f1 31 c0 e8 cc 78 2f ff <0f> 0b 48 c7 c7 3c 8a 98 84 4c 89 f6 4c 89 e1 31 c0 e8 b6 78 2f ff RSP: 0018:ffff8881c855f2c8 EFLAGS: 00010246 RAX: 0000000000000075 RBX: ffff8881ced62c88 RCX: 5149f616ba145a00 RDX: ffffc90004413000 RSI: 0000000000004ec6 RDI: 0000000000004ec7 RBP: ffff8881ced62c80 R08: ffffffff812bdcbe R09: ffffed103b705de0 R10: ffffed103b705de0 R11: 0000000000000000 R12: ffffffff84cb53a0 R13: dffffc0000000000 R14: ffff8881ced62c80 R15: ffff8881cb267480 FS: 00007f8ae4c77700(0000) GS:ffff8881db800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fdf1812c010 CR3: 0000000177e4d003 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400