Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] CPU: 0 UID: 0 PID: 5812 Comm: syz-execprog Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:NODE_MAPPING fs/f2fs/f2fs.h:2260 [inline] RIP: 0010:is_node_folio fs/f2fs/f2fs.h:2270 [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 71 aa fd 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 54 aa fd fd 4d 3b 37 74 19 e8 fa RSP: 0018:ffffc900047c6b68 EFLAGS: 00010206 RAX: 0000000000000006 RBX: ffffea0000d09640 RCX: ffff88803bd05ac0 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000100 RBP: ffffea0000d09658 R08: ffff888030055aeb R09: 1ffff1100600ab5d R10: dffffc0000000000 R11: ffffed100600ab5e R12: ffff888038c9c798 R13: dffffc0000000000 R14: ffff88805b14d050 R15: 0000000000000030 FS: 000000c00007c898(0000) GS:ffff888126340000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c009204000 CR3: 0000000046272000 CR4: 00000000003526f0 Call Trace: f2fs_write_end_io+0x7ab/0xff0 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_flush_complete_seq+0x687/0xce0 block/blk-flush.c:191 flush_end_io+0xc40/0xf30 block/blk-flush.c:251 __blk_mq_end_request+0x4a9/0x680 block/blk-mq.c:1168 blk_complete_reqs block/blk-mq.c:1253 [inline] blk_done_softirq+0x10a/0x160 block/blk-mq.c:1258 handle_softirqs+0x1de/0x6f0 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] rcu_read_unlock_bh include/linux/rcupdate.h:924 [inline] __dev_queue_xmit+0x1eb9/0x39d0 net/core/dev.c:4876 dev_queue_xmit include/linux/netdevice.h:3384 [inline] neigh_hh_output include/net/neighbour.h:540 [inline] neigh_output include/net/neighbour.h:554 [inline] ip_finish_output2+0xcab/0x10b0 net/ipv4/ip_output.c:237 NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip_output+0x29f/0x450 net/ipv4/ip_output.c:438 ip_local_out net/ipv4/ip_output.c:131 [inline] __ip_queue_xmit+0x1198/0x1be0 net/ipv4/ip_output.c:534 __tcp_transmit_skb+0x2b30/0x43e0 net/ipv4/tcp_output.c:1693 tcp_transmit_skb net/ipv4/tcp_output.c:1711 [inline] tcp_write_xmit+0x16e8/0x6980 net/ipv4/tcp_output.c:3064 __tcp_push_pending_frames+0x97/0x380 net/ipv4/tcp_output.c:3247 tcp_sendmsg_locked+0x4838/0x5490 net/ipv4/tcp.c:1427 tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1464 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] sock_write_iter+0x329/0x550 net/socket.c:1195 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x629/0xba0 fs/read_write.c:688 ksys_write+0x156/0x270 fs/read_write.c:740 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x40dd0e Code: 24 28 44 8b 44 24 2c e9 70 ff ff ff cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 49 89 f2 48 89 fa 48 89 ce 48 89 df 0f 05 <48> 3d 01 f0 ff ff 76 15 48 f7 d8 48 89 c1 48 c7 c0 ff ff ff ff 48 RSP: 002b:000000c0043d53e8 EFLAGS: 00000206 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 000000000040dd0e RDX: 00000000000057b8 RSI: 000000c003c32848 RDI: 0000000000000006 RBP: 000000c0043d5428 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 000000c0043d5558 R13: 0000000000004866 R14: 000000c0043ba1c0 R15: 000000c003c2e000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:NODE_MAPPING fs/f2fs/f2fs.h:2260 [inline] RIP: 0010:is_node_folio fs/f2fs/f2fs.h:2270 [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 71 aa fd 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 54 aa fd fd 4d 3b 37 74 19 e8 fa RSP: 0018:ffffc900047c6b68 EFLAGS: 00010206 RAX: 0000000000000006 RBX: ffffea0000d09640 RCX: ffff88803bd05ac0 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000100 RBP: ffffea0000d09658 R08: ffff888030055aeb R09: 1ffff1100600ab5d R10: dffffc0000000000 R11: ffffed100600ab5e R12: ffff888038c9c798 R13: dffffc0000000000 R14: ffff88805b14d050 R15: 0000000000000030 FS: 000000c00007c898(0000) GS:ffff888126340000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c009204000 CR3: 0000000046272000 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 71 aa fd fd call 0xfdfdaa8d 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 54 aa fd fd call 0xfdfdaa8d 39: 4d 3b 37 cmp (%r15),%r14 3c: 74 19 je 0x57 3e: e8 .byte 0xe8 3f: fa cli