skbuff: skb_over_panic: text:ffffffff843b8b93 len:56 put:8 head:ffff888110551c00 data:ffff888110551c50 tail:0x88 end:0x80 dev:ip6gretap1 ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:110! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 22437 Comm: syz-executor.1 Not tainted 5.10.77-syzkaller-01258-g76698ea35fd3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:skb_panic+0x14f/0x160 net/core/skbuff.c:106 Code: 87 85 48 8b 75 c0 48 8b 55 b8 8b 4d d4 44 8b 45 d0 4c 8b 4d c8 b8 00 00 00 00 53 41 56 41 55 41 54 e8 8c 4d 89 fd 48 83 c4 20 <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 55 48 89 e5 41 RSP: 0018:ffffc900001609d0 EFLAGS: 00010282 RAX: 0000000000000088 RBX: ffff88816295c000 RCX: 4293ae7fe08d6900 RDX: 0000000000000502 RSI: 0000000000000502 RDI: 0000000000000000 RBP: ffffc90000160a18 R08: ffffffff81545288 R09: fffff5200002c061 R10: fffff5200002c061 R11: 0000000000000000 R12: ffff888110551c50 R13: 0000000000000088 R14: 0000000000000080 R15: dffffc0000000000 FS: 00007f50d488c700(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd5dc902000 CR3: 0000000113f26000 CR4: 00000000003526a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: skb_over_panic+0x2c/0x30 net/core/skbuff.c:115 skb_put+0x205/0x210 net/core/skbuff.c:1877 mld_newpack+0x653/0x9c0 net/ipv6/mcast.c:1626 add_grhead net/ipv6/mcast.c:1707 [inline] add_grec+0xf40/0x1370 net/ipv6/mcast.c:1838 mld_send_cr net/ipv6/mcast.c:1964 [inline] mld_ifc_timer_expire+0x781/0xc50 net/ipv6/mcast.c:2471 call_timer_fn+0x35/0x280 kernel/time/timer.c:1420 expire_timers+0x21f/0x3b0 kernel/time/timer.c:1465 __run_timers+0x548/0x680 kernel/time/timer.c:1756 run_timer_softirq+0x69/0xf0 kernel/time/timer.c:1769 __do_softirq+0x27e/0x598 kernel/softirq.c:305 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x60/0x80 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:402 [inline] __irq_exit_rcu+0x128/0x150 kernel/softirq.c:432 irq_exit_rcu+0x9/0x10 kernel/softirq.c:444 sysvec_apic_timer_interrupt+0xbf/0xe0 arch/x86/kernel/apic/apic.c:1095 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635 RIP: 0010:__sanitizer_cov_trace_pc+0x1/0x60 kernel/kcov.c:190 Code: 84 00 00 00 00 00 0f 1f 00 be 0c 00 00 00 48 c7 c7 60 f3 5b 86 e8 7f c7 39 00 c3 cc cc cc cc cc cc cc cc cc cc cc cc cc cc 55 <48> 89 e5 48 8b 45 08 65 48 8b 0c 25 80 ed 01 00 65 8b 15 14 f5 94 RSP: 0018:ffffc900032b6d10 EFLAGS: 00000246 RAX: 0000000000000002 RBX: 0000000000000001 RCX: 0000000000000001 RDX: ffff8881055d62c0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900032b6eb0 R08: ffffffff81e13322 R09: ffffed1021713c14 R10: ffffed1021713c14 R11: 0000000000000000 R12: ffff888168bb62a0 R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000061 ext4_block_write_begin+0x5d5/0x1350 fs/ext4/inode.c:1078 ext4_da_write_begin+0x7f8/0xfb0 fs/ext4/inode.c:3047 generic_perform_write+0x309/0x5b0 mm/filemap.c:3468 ext4_buffered_write_iter+0x47c/0x610 fs/ext4/file.c:272 ext4_file_write_iter+0x485/0x1b70 fs/ext4/file.c:522 do_iter_readv_writev+0x548/0x740 include/linux/fs.h:1941 do_iter_write+0x182/0x660 fs/read_write.c:866 vfs_iter_write+0x7c/0xa0 fs/read_write.c:907 iter_file_splice_write+0x7fb/0xf70 fs/splice.c:686 do_splice_from fs/splice.c:764 [inline] direct_splice_actor+0xfe/0x130 fs/splice.c:933 splice_direct_to_actor+0x4f4/0xbc0 fs/splice.c:888 do_splice_direct+0x28b/0x3e0 fs/splice.c:976 do_sendfile+0x914/0x1390 fs/read_write.c:1257 __do_sys_sendfile64 fs/read_write.c:1318 [inline] __se_sys_sendfile64 fs/read_write.c:1304 [inline] __x64_sys_sendfile64+0x1c4/0x220 fs/read_write.c:1304 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f50d6b15ae9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f50d488c188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f50d6c28f60 RCX: 00007f50d6b15ae9 RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000006 RBP: 00007f50d6b6ff25 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000401ffc000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe1115722f R14: 00007f50d488c300 R15: 0000000000022000 Modules linked in: ---[ end trace fac604043ba43c81 ]--- RIP: 0010:skb_panic+0x14f/0x160 net/core/skbuff.c:106 Code: 87 85 48 8b 75 c0 48 8b 55 b8 8b 4d d4 44 8b 45 d0 4c 8b 4d c8 b8 00 00 00 00 53 41 56 41 55 41 54 e8 8c 4d 89 fd 48 83 c4 20 <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 55 48 89 e5 41 RSP: 0018:ffffc900001609d0 EFLAGS: 00010282 RAX: 0000000000000088 RBX: ffff88816295c000 RCX: 4293ae7fe08d6900 RDX: 0000000000000502 RSI: 0000000000000502 RDI: 0000000000000000 RBP: ffffc90000160a18 R08: ffffffff81545288 R09: fffff5200002c061 R10: fffff5200002c061 R11: 0000000000000000 R12: ffff888110551c50 R13: 0000000000000088 R14: 0000000000000080 R15: dffffc0000000000 FS: 00007f50d488c700(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd5dc902000 CR3: 0000000113f26000 CR4: 00000000003526a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 84 00 test %al,(%rax) 2: 00 00 add %al,(%rax) 4: 00 00 add %al,(%rax) 6: 0f 1f 00 nopl (%rax) 9: be 0c 00 00 00 mov $0xc,%esi e: 48 c7 c7 60 f3 5b 86 mov $0xffffffff865bf360,%rdi 15: e8 7f c7 39 00 callq 0x39c799 1a: c3 retq 1b: cc int3 1c: cc int3 1d: cc int3 1e: cc int3 1f: cc int3 20: cc int3 21: cc int3 22: cc int3 23: cc int3 24: cc int3 25: cc int3 26: cc int3 27: cc int3 28: cc int3 29: 55 push %rbp * 2a: 48 89 e5 mov %rsp,%rbp <-- trapping instruction 2d: 48 8b 45 08 mov 0x8(%rbp),%rax 31: 65 48 8b 0c 25 80 ed mov %gs:0x1ed80,%rcx 38: 01 00 3a: 65 gs 3b: 8b .byte 0x8b 3c: 15 .byte 0x15 3d: 14 f5 adc $0xf5,%al 3f: 94 xchg %eax,%esp