Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] CPU: 1 UID: 0 PID: 9816 Comm: syz-executor Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:NODE_MAPPING fs/f2fs/f2fs.h:2258 [inline] RIP: 0010:is_node_folio fs/f2fs/f2fs.h:2268 [inline] RIP: 0010:f2fs_in_warm_node_list+0xbd/0x290 fs/f2fs/node.c:330 Code: 00 00 4d 03 3c 24 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 21 98 fa fd 4d 8b 3f 49 83 c7 30 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 04 98 fa fd 4d 3b 37 74 19 e8 4a RSP: 0018:ffffc9000721f670 EFLAGS: 00010206 RAX: 0000000000000006 RBX: ffffea000146fac0 RCX: ffff88803afa0000 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000100 RBP: dffffc0000000000 R08: ffffffff8f8bcaf7 R09: 1ffffffff1f1795e R10: dffffc0000000000 R11: fffffbfff1f1795f R12: ffff888024a10798 R13: dffffc0000000000 R14: ffff888063b795a0 R15: 0000000000000030 FS: 0000555587a1c500(0000) GS:ffff8881261fb000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9645790000 CR3: 0000000036fa4000 CR4: 00000000003526f0 Call Trace: f2fs_write_end_io+0xa31/0x1740 fs/f2fs/data.c:400 blk_update_request+0x57e/0xe60 block/blk-mq.c:1016 blk_mq_end_request+0x3e/0x70 block/blk-mq.c:1178 blk_complete_reqs block/blk-mq.c:1253 [inline] blk_done_softirq+0x10a/0x160 block/blk-mq.c:1258 handle_softirqs+0x1de/0x6d0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] __local_bh_enable_ip+0x170/0x2b0 kernel/softirq.c:302 local_bh_enable include/linux/bottom_half.h:33 [inline] __alloc_skb+0x1aa/0x7d0 net/core/skbuff.c:697 alloc_skb include/linux/skbuff.h:1383 [inline] nlmsg_new include/net/netlink.h:1055 [inline] inet_netconf_notify_devconf+0x173/0x240 net/ipv4/devinet.c:2244 __devinet_sysctl_register+0x401/0x490 net/ipv4/devinet.c:2718 devinet_init_net+0x362/0x7c0 net/ipv4/devinet.c:2840 ops_init+0x35c/0x5c0 net/core/net_namespace.c:137 setup_net+0x118/0x340 net/core/net_namespace.c:446 copy_net_ns+0x50e/0x730 net/core/net_namespace.c:579 create_new_namespaces+0x3e7/0x6a0 kernel/nsproxy.c:132 unshare_nsproxy_namespaces+0x149/0x190 kernel/nsproxy.c:234 ksys_unshare+0x57d/0x9f0 kernel/fork.c:3245 __do_sys_unshare kernel/fork.c:3319 [inline] __se_sys_unshare kernel/fork.c:3317 [inline] __x64_sys_unshare+0x38/0x50 kernel/fork.c:3317 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe0fe6adae7 Code: 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 10 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffdebcb2718 EFLAGS: 00000206 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 00007fe0fe925f40 RCX: 00007fe0fe6adae7 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000 RBP: 00007fe0fe9267b8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000008 R13: 0000000000000003 R14: 00007ffdebcb2958 R15: 0000000000000000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:NODE_MAPPING fs/f2fs/f2fs.h:2258 [inline] RIP: 0010:is_node_folio fs/f2fs/f2fs.h:2268 [inline] RIP: 0010:f2fs_in_warm_node_list+0xbd/0x290 fs/f2fs/node.c:330 Code: 00 00 4d 03 3c 24 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 21 98 fa fd 4d 8b 3f 49 83 c7 30 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 04 98 fa fd 4d 3b 37 74 19 e8 4a RSP: 0018:ffffc9000721f670 EFLAGS: 00010206 RAX: 0000000000000006 RBX: ffffea000146fac0 RCX: ffff88803afa0000 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000100 RBP: dffffc0000000000 R08: ffffffff8f8bcaf7 R09: 1ffffffff1f1795e R10: dffffc0000000000 R11: fffffbfff1f1795f R12: ffff888024a10798 R13: dffffc0000000000 R14: ffff888063b795a0 R15: 0000000000000030 FS: 0000555587a1c500(0000) GS:ffff8881261fb000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9645790000 CR3: 0000000036fa4000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 4d 03 3c 24 add (%r12),%r15 6: 4c 89 f8 mov %r15,%rax 9: 48 c1 e8 03 shr $0x3,%rax d: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) 12: 74 08 je 0x1c 14: 4c 89 ff mov %r15,%rdi 17: e8 21 98 fa fd call 0xfdfa983d 1c: 4d 8b 3f mov (%r15),%r15 1f: 49 83 c7 30 add $0x30,%r15 23: 4c 89 f8 mov %r15,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 ff mov %r15,%rdi 34: e8 04 98 fa fd call 0xfdfa983d 39: 4d 3b 37 cmp (%r15),%r14 3c: 74 19 je 0x57 3e: e8 .byte 0xe8 3f: 4a rex.WX