EXT4-fs (loop4): last error at time 1776789491: __ext4_get_inode_loc:4885 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: 5478 Comm: dhcpcd 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 a1 9c 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 84 9c fa fd 4d 3b 37 74 19 e8 ca RSP: 0018:ffffc90004057430 EFLAGS: 00010206 RAX: 0000000000000006 RBX: ffffea0001985bc0 RCX: ffff888026e51ec0 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000100 RBP: dffffc0000000000 R08: ffff88803f40bdab R09: 1ffff11007e817b5 R10: dffffc0000000000 R11: ffffed1007e817b6 R12: ffff888066b1e798 R13: dffffc0000000000 R14: ffff88805f2c5938 R15: 0000000000000030 FS: 00007ff86200c780(0000) GS:ffff8881260fe000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f093f7d2000 CR3: 000000003c85c000 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_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/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] alloc_skb_with_frags+0xc8/0x760 net/core/skbuff.c:6734 sock_alloc_send_pskb+0x884/0x9a0 net/core/sock.c:2998 unix_dgram_sendmsg+0x460/0x18d0 net/unix/af_unix.c:2131 sock_sendmsg_nosec net/socket.c:787 [inline] __sock_sendmsg net/socket.c:802 [inline] __sys_sendto+0x67f/0x710 net/socket.c:2265 __do_sys_sendto net/socket.c:2272 [inline] __se_sys_sendto net/socket.c:2268 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2268 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: 0033:0x7ff862096407 Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007ffd35bb8120 EFLAGS: 00000202 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007ff86200c780 RCX: 00007ff862096407 RDX: 000000000000004e RSI: 00007ffd35bb8260 RDI: 0000000000000003 RBP: 00007ffd35bb8690 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000004000 R11: 0000000000000202 R12: 00007ffd35bb8ae0 R13: 00007ffd35bb8260 R14: 000000000000002c R15: 00007ffd35bb8260 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 a1 9c 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 84 9c fa fd 4d 3b 37 74 19 e8 ca RSP: 0018:ffffc90004057430 EFLAGS: 00010206 RAX: 0000000000000006 RBX: ffffea0001985bc0 RCX: ffff888026e51ec0 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000100 RBP: dffffc0000000000 R08: ffff88803f40bdab R09: 1ffff11007e817b5 R10: dffffc0000000000 R11: ffffed1007e817b6 R12: ffff888066b1e798 R13: dffffc0000000000 R14: ffff88805f2c5938 R15: 0000000000000030 FS: 00007ff86200c780(0000) GS:ffff8881260fe000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f093f7d2000 CR3: 000000003c85c000 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 a1 9c fa fd call 0xfdfa9cbd 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 84 9c fa fd call 0xfdfa9cbd 39: 4d 3b 37 cmp (%r15),%r14 3c: 74 19 je 0x57 3e: e8 .byte 0xe8 3f: ca .byte 0xca