non-slab/vmalloc memory list_add corruption. next->prev should be prev (ffffffff8f6b60e0), but was ffff88802725e600. (next=ffffffff8f6b60e0). ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:29! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 1 UID: 0 PID: 21989 Comm: syz.1.4199 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:__list_add_valid_or_report+0xec/0x190 lib/list_debug.c:29 Code: 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 a5 00 00 00 48 8b 55 08 48 89 e9 48 c7 c7 c0 b7 f2 8b e8 95 78 e9 fc 90 <0f> 0b 48 89 f7 48 89 34 24 e8 e6 ee 4f fd 48 8b 34 24 48 b8 00 00 RSP: 0018:ffffc9002736ef18 EFLAGS: 00010282 RAX: 0000000000000075 RBX: 0000000000000001 RCX: ffffc900297e6000 RDX: 0000000000000000 RSI: ffffffff819ca489 RDI: 0000000000000005 RBP: ffffffff8f6b60e0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000000 R11: ffff888023e7d4b0 R12: ffff888028213200 R13: ffffffff8f6b60e8 R14: ffffffff8f6b60e8 R15: ffffc9002736eff8 FS: 0000000000000000(0000) GS:ffff8880977fc000(0063) knlGS:00000000f541bb40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000035015ffc CR3: 000000004d7fd000 CR4: 0000000000352ef0 Call Trace: __list_add_valid include/linux/list.h:96 [inline] __list_add include/linux/list.h:158 [inline] list_add_tail include/linux/list.h:191 [inline] flow_block_cb_setup_simple+0x764/0xa20 net/core/flow_offload.c:361 nsim_setup_tc+0x11d/0x150 drivers/net/netdevsim/netdev.c:374 nft_block_offload_cmd+0x13d/0x1e0 net/netfilter/nf_tables_offload.c:397 nft_chain_offload_cmd net/netfilter/nf_tables_offload.c:451 [inline] nft_flow_block_chain+0x149/0x460 net/netfilter/nf_tables_offload.c:471 nft_flow_offload_chain net/netfilter/nf_tables_offload.c:513 [inline] nft_flow_rule_offload_commit+0x378/0x690 net/netfilter/nf_tables_offload.c:584 nf_tables_commit+0x5d8/0x8c40 net/netfilter/nf_tables_api.c:10984 nfnetlink_rcv_batch+0x115e/0x2350 net/netfilter/nfnetlink.c:576 nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:649 [inline] nfnetlink_rcv+0x3c1/0x430 net/netfilter/nfnetlink.c:667 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x5aa/0x870 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x8c8/0xdd0 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0xa5d/0xc30 net/socket.c:2592 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2646 __sys_sendmsg+0x16d/0x220 net/socket.c:2678 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0xe8/0x680 arch/x86/entry/syscall_32.c:307 do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:332 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf706d579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f541b55c EFLAGS: 00000296 ORIG_RAX: 0000000000000172 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000008000c2c0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__list_add_valid_or_report+0xec/0x190 lib/list_debug.c:29 Code: 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 a5 00 00 00 48 8b 55 08 48 89 e9 48 c7 c7 c0 b7 f2 8b e8 95 78 e9 fc 90 <0f> 0b 48 89 f7 48 89 34 24 e8 e6 ee 4f fd 48 8b 34 24 48 b8 00 00 RSP: 0018:ffffc9002736ef18 EFLAGS: 00010282 RAX: 0000000000000075 RBX: 0000000000000001 RCX: ffffc900297e6000 RDX: 0000000000000000 RSI: ffffffff819ca489 RDI: 0000000000000005 RBP: ffffffff8f6b60e0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000000 R11: ffff888023e7d4b0 R12: ffff888028213200 R13: ffffffff8f6b60e8 R14: ffffffff8f6b60e8 R15: ffffc9002736eff8 FS: 0000000000000000(0000) GS:ffff8880977fc000(0063) knlGS:00000000f541bb40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000035015ffc CR3: 000000004d7fd000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi