slab kmalloc-64 start ffff888023c23980 pointer offset 40 size 64 list_add corruption. prev->next should be next (ffff88805628d3c0), but was ffff8880285b2a28. (prev=ffff888023c239a8). ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:34! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 0 UID: 0 PID: 12095 Comm: syz.2.1692 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:__list_add_valid_or_report+0x123/0x130 lib/list_debug.c:32 Code: e8 a2 eb 31 fd 43 80 3c 2c 00 74 08 4c 89 f7 e8 83 df 52 fd 49 8b 16 48 c7 c7 40 3a e3 8b 48 89 de 4c 89 f1 e8 5e 65 57 fc 90 <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc9000d1cf4a8 EFLAGS: 00010246 RAX: 0000000000000075 RBX: ffff88805628d3c0 RCX: b8e30b4d65b25b00 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: 1ffff1100ac51a79 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffffbfff1bfa1ec R12: 1ffff11004784735 R13: dffffc0000000000 R14: ffff888023c239a8 R15: ffff8880285b24a8 FS: 00007fdac22936c0(0000) GS:ffff888125c18000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000002400 CR3: 000000007459a000 CR4: 00000000003526f0 Call Trace: __list_add_valid include/linux/list.h:88 [inline] __list_add include/linux/list.h:150 [inline] list_add_tail include/linux/list.h:183 [inline] nsim_bpf_create_prog drivers/net/netdevsim/bpf.c:247 [inline] nsim_bpf_verifier_prep+0x397/0x530 drivers/net/netdevsim/bpf.c:262 bpf_prog_offload_verifier_prep+0xd0/0x140 kernel/bpf/offload.c:305 bpf_check+0x1cf6/0x1d2d0 kernel/bpf/verifier.c:24678 bpf_prog_load+0x1318/0x1930 kernel/bpf/syscall.c:2979 __sys_bpf+0x528/0x870 kernel/bpf/syscall.c:6029 __do_sys_bpf kernel/bpf/syscall.c:6139 [inline] __se_sys_bpf kernel/bpf/syscall.c:6137 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6137 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fdac138ebe9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fdac2293038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fdac15c6090 RCX: 00007fdac138ebe9 RDX: 0000000000000094 RSI: 0000200000000640 RDI: 0000000000000005 RBP: 00007fdac1411e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fdac15c6128 R14: 00007fdac15c6090 R15: 00007fff0483c898 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__list_add_valid_or_report+0x123/0x130 lib/list_debug.c:32 Code: e8 a2 eb 31 fd 43 80 3c 2c 00 74 08 4c 89 f7 e8 83 df 52 fd 49 8b 16 48 c7 c7 40 3a e3 8b 48 89 de 4c 89 f1 e8 5e 65 57 fc 90 <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc9000d1cf4a8 EFLAGS: 00010246 RAX: 0000000000000075 RBX: ffff88805628d3c0 RCX: b8e30b4d65b25b00 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: 1ffff1100ac51a79 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffffbfff1bfa1ec R12: 1ffff11004784735 R13: dffffc0000000000 R14: ffff888023c239a8 R15: ffff8880285b24a8 FS: 00007fdac22936c0(0000) GS:ffff888125d18000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555873675c8 CR3: 000000007459a000 CR4: 00000000003526f0