Oops: general protection fault, probably for non-canonical address 0xdffffc001fffe000: 0000 [#1] SMP KASAN NOPTI KASAN: probably user-memory-access in range [0x00000000ffff0000-0x00000000ffff0007] CPU: 0 UID: 0 PID: 9527 Comm: kworker/0:11 Not tainted 6.16.0-rc7-syzkaller-00140-gec2df4364666 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Workqueue: mld mld_ifc_work RIP: 0010:add_grec+0x764/0x1670 net/ipv6/mcast.c:1967 Code: 41 01 41 89 c7 31 ff 89 c6 e8 88 a6 93 f7 45 85 ff 0f 84 b0 00 00 00 e8 3a a2 93 f7 eb 05 e8 33 a2 93 f7 49 89 ee 49 c1 ee 03 <43> 80 3c 26 00 74 08 48 89 ef e8 1d b4 f5 f7 48 8b 45 00 48 89 84 RSP: 0018:ffffc900051978f8 EFLAGS: 00010216 RAX: ffffffff8a2c84a6 RBX: ffff888054a5a140 RCX: ffff88801e6f3c00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 00000000ffff0000 R08: ffff88801e6f3c00 R09: 0000000000000002 R10: 0000000000000004 R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000005 R14: 000000001fffe000 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff888125c23000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fdb881823f8 CR3: 000000000df38000 CR4: 0000000000350ef0 Call Trace: mld_send_cr net/ipv6/mcast.c:2155 [inline] mld_ifc_work+0x671/0xde0 net/ipv6/mcast.c:2702 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402 kthread+0x711/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:add_grec+0x764/0x1670 net/ipv6/mcast.c:1967 Code: 41 01 41 89 c7 31 ff 89 c6 e8 88 a6 93 f7 45 85 ff 0f 84 b0 00 00 00 e8 3a a2 93 f7 eb 05 e8 33 a2 93 f7 49 89 ee 49 c1 ee 03 <43> 80 3c 26 00 74 08 48 89 ef e8 1d b4 f5 f7 48 8b 45 00 48 89 84 RSP: 0018:ffffc900051978f8 EFLAGS: 00010216 RAX: ffffffff8a2c84a6 RBX: ffff888054a5a140 RCX: ffff88801e6f3c00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 00000000ffff0000 R08: ffff88801e6f3c00 R09: 0000000000000002 R10: 0000000000000004 R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000005 R14: 000000001fffe000 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff888125c23000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200001000000 CR3: 000000000df38000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 41 89 c7 mov %eax,%r15d 3: 31 ff xor %edi,%edi 5: 89 c6 mov %eax,%esi 7: e8 88 a6 93 f7 call 0xf793a694 c: 45 85 ff test %r15d,%r15d f: 0f 84 b0 00 00 00 je 0xc5 15: e8 3a a2 93 f7 call 0xf793a254 1a: eb 05 jmp 0x21 1c: e8 33 a2 93 f7 call 0xf793a254 21: 49 89 ee mov %rbp,%r14 24: 49 c1 ee 03 shr $0x3,%r14 * 28: 43 80 3c 26 00 cmpb $0x0,(%r14,%r12,1) <-- trapping instruction 2d: 74 08 je 0x37 2f: 48 89 ef mov %rbp,%rdi 32: e8 1d b4 f5 f7 call 0xf7f5b454 37: 48 8b 45 00 mov 0x0(%rbp),%rax 3b: 48 rex.W 3c: 89 .byte 0x89 3d: 84 .byte 0x84