Hello, When using Healer to fuzz the latest Linux kernel, the following crash was triggered. HEAD commit: 92477dd1faa6 Merge tag 's390-5.15-ebpf-jit-fixes' git tree: upstream console output: https://drive.google.com/file/d/1f2RLLaRmVwV9ffKgoHvMuXGSs-730rdm/view?usp=sharing kernel config: https://drive.google.com/file/d/1KgvcM8i_3hQiOL3fUh3JFpYNQM4itvV4/view?usp=sharing Sorry, I don't have a reproducer for this crash, hope the symbolized report can help. If you fix this issue, please add the following tag to the commit: Reported-by: Hao Sun <sunhao.th@xxxxxxxxx> ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:2185! invalid opcode: 0000 [#1] PREEMPT SMP CPU: 0 PID: 13386 Comm: syz-executor Not tainted 5.15.0-rc2+ #20 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 RIP: 0010:__pskb_pull_tail+0x559/0x5d0 net/core/skbuff.c:2184 Code: 00 00 4d 8b ac 24 c8 00 00 00 e9 0a ff ff ff e8 6d 4e cd fd 48 c7 c6 d0 cd 29 85 48 89 df e8 ae 55 e1 fd 0f 0b e8 57 4e cd fd <0f> 0b 89 45 c0 e8 4d 4e cd fd 8b 45 c0 44 89 f6 48 89 df 29 c6 e8 RSP: 0018:ffffc90000003af0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888017d3d000 RCX: 0000000000000100 RDX: ffff8881121cc500 RSI: ffffffff836a4329 RDI: ffff888018d0d6e8 RBP: ffffc90000003b40 R08: 0000000000082a20 R09: 00000000ffffffff R10: ffffffff836a189d R11: 0000000000000000 R12: ffff888018d0d6e8 R13: 00000000000000c3 R14: 0000000000000140 R15: 00000000000002c0 FS: 00007fbde2a45700(0000) GS:ffff88807dc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000400000 CR3: 0000000111c21000 CR4: 0000000000752ef0 DR0: 0afa2a56b5df4b30 DR1: 000000000000000c DR2: 4a2a504b7424fb1b DR3: 000000000000004f DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554 Call Trace: <IRQ> skb_condense+0x66/0x90 net/core/skbuff.c:6373 ___pskb_trim+0x29a/0x4e0 net/core/skbuff.c:2119 __pskb_trim include/linux/skbuff.h:2734 [inline] pskb_trim include/linux/skbuff.h:2741 [inline] sk_filter_trim_cap+0x3e1/0x420 net/core/filter.c:152 tcp_filter net/ipv4/tcp_ipv4.c:1905 [inline] tcp_v4_rcv+0x1027/0x12e0 net/ipv4/tcp_ipv4.c:2066 ip_protocol_deliver_rcu+0x51/0x410 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0xa0/0x180 net/ipv4/ip_input.c:231 NF_HOOK include/linux/netfilter.h:307 [inline] ip_local_deliver+0x8a/0x280 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:460 [inline] ip_rcv_finish+0xba/0x120 net/ipv4/ip_input.c:429 NF_HOOK include/linux/netfilter.h:307 [inline] ip_rcv+0x153/0x270 net/ipv4/ip_input.c:540 __netif_receive_skb_one_core+0x67/0x90 net/core/dev.c:5436 __netif_receive_skb+0x22/0x80 net/core/dev.c:5550 process_backlog+0x8a/0x2c0 net/core/dev.c:6427 __napi_poll+0x31/0x310 net/core/dev.c:6982 napi_poll net/core/dev.c:7049 [inline] net_rx_action+0x357/0x410 net/core/dev.c:7136 __do_softirq+0xe9/0x561 kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu kernel/softirq.c:636 [inline] irq_exit_rcu+0xe2/0x100 kernel/softirq.c:648 sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1097 </IRQ> asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x7/0x60 kernel/kcov.c:197 Code: ff 00 75 10 65 48 8b 04 25 40 70 01 00 48 8b 80 28 15 00 00 c3 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 65 8b 05 79 de c9 7e <89> c1 48 8b 34 24 65 48 8b 14 25 40 70 01 00 81 e1 00 01 00 00 a9 RSP: 0018:ffffc9000ab57c28 EFLAGS: 00000286 RAX: 0000000080000001 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff8881121cc500 RSI: ffffffff8555b286 RDI: 0000000000000000 RBP: ffffc9000ab57c60 R08: 0000000000000000 R09: 0000000000000001 R10: 00000000fffffffe R11: 000000000002fda0 R12: 0000000000000000 R13: ffffc9000ab57dc0 R14: ffff88807dc24b60 R15: 0000000000000001 lru_add_drain_cpu+0x1c/0x450 mm/swap.c:594 lru_add_drain+0xa0/0x200 mm/swap.c:702 __pagevec_release+0x19/0x40 mm/swap.c:967 pagevec_release include/linux/pagevec.h:81 [inline] __munlock_pagevec+0xce5/0x1150 mm/mlock.c:307 munlock_vma_pages_range+0x3fc/0x720 mm/mlock.c:475 mlock_fixup+0x16f/0x220 mm/mlock.c:552 apply_vma_lock_flags+0x11a/0x170 mm/mlock.c:590 __do_sys_munlock mm/mlock.c:723 [inline] __se_sys_munlock mm/mlock.c:712 [inline] __x64_sys_munlock+0x8d/0x120 mm/mlock.c:712 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x34/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x2000098a Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 98 4a 2a e9 2c b8 b6 4c 0f 05 <bf> 00 00 40 00 c4 a3 7b f0 c5 01 41 e2 e9 c4 22 e9 aa bb 3c 00 00 RSP: 002b:00007fbde2a44ba8 EFLAGS: 00000a87 ORIG_RAX: 0000000000000096 RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 000000002000098a RDX: 0000000000004c01 RSI: 0000000000000003 RDI: 0000000000400000 RBP: 0000000000000013 R08: 0000000000000005 R09: 0000000000000006 R10: 0000000000000007 R11: 0000000000000a87 R12: 000000000000000b R13: 000000000000000c R14: 000000000000000d R15: 00007ffe9d51e330 Modules linked in: Dumping ftrace buffer: (ftrace buffer empty) ---[ end trace 7c793e5154a72638 ]--- RIP: 0010:__pskb_pull_tail+0x559/0x5d0 net/core/skbuff.c:2184 Code: 00 00 4d 8b ac 24 c8 00 00 00 e9 0a ff ff ff e8 6d 4e cd fd 48 c7 c6 d0 cd 29 85 48 89 df e8 ae 55 e1 fd 0f 0b e8 57 4e cd fd <0f> 0b 89 45 c0 e8 4d 4e cd fd 8b 45 c0 44 89 f6 48 89 df 29 c6 e8 RSP: 0018:ffffc90000003af0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888017d3d000 RCX: 0000000000000100 RDX: ffff8881121cc500 RSI: ffffffff836a4329 RDI: ffff888018d0d6e8 RBP: ffffc90000003b40 R08: 0000000000082a20 R09: 00000000ffffffff R10: ffffffff836a189d R11: 0000000000000000 R12: ffff888018d0d6e8 R13: 00000000000000c3 R14: 0000000000000140 R15: 00000000000002c0 FS: 00007fbde2a45700(0000) GS:ffff88807dc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000400000 CR3: 0000000111c21000 CR4: 0000000000752ef0 DR0: 0afa2a56b5df4b30 DR1: 000000000000000c DR2: 4a2a504b7424fb1b DR3: 000000000000004f DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554 ---------------- Code disassembly (best guess): 0: ff 00 incl (%rax) 2: 75 10 jne 0x14 4: 65 48 8b 04 25 40 70 mov %gs:0x17040,%rax b: 01 00 d: 48 8b 80 28 15 00 00 mov 0x1528(%rax),%rax 14: c3 retq 15: 0f 1f 40 00 nopl 0x0(%rax) 19: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) 20: 00 00 00 23: 65 8b 05 79 de c9 7e mov %gs:0x7ec9de79(%rip),%eax # 0x7ec9dea3 * 2a: 89 c1 mov %eax,%ecx <-- trapping instruction 2c: 48 8b 34 24 mov (%rsp),%rsi 30: 65 48 8b 14 25 40 70 mov %gs:0x17040,%rdx 37: 01 00 39: 81 e1 00 01 00 00 and $0x100,%ecx 3f: a9 .byte 0xa9
