Hello, syzbot found the following issue on: HEAD commit: 69b8923f5003 Merge tag 'for-linus-6.14-ofs4' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15912eb0580000 kernel config: https://syzkaller.appspot.com/x/.config?x=57ab43c279fa614d dashboard link: https://syzkaller.appspot.com/bug?extid=94c6d316eec8a68cc993 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=169983df980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/ea84ac864e92/disk-69b8923f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/6a465997b4e0/vmlinux-69b8923f.xz kernel image: https://storage.googleapis.com/syzbot-assets/d72b67b2bd15/bzImage-69b8923f.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/0073f7fa8a9c/mount_0.gz The issue was bisected to: commit 14152654805256d760315ec24e414363bfa19a06 Author: Kent Overstreet <kent.overstreet@xxxxxxxxx> Date: Mon Nov 25 05:21:27 2024 +0000 bcachefs: Bad btree roots are now autofix bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=13505df8580000 final oops: https://syzkaller.appspot.com/x/report.txt?x=10d05df8580000 console output: https://syzkaller.appspot.com/x/log.txt?x=17505df8580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+94c6d316eec8a68cc993@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 141526548052 ("bcachefs: Bad btree roots are now autofix") Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 UID: 0 PID: 12 Comm: kworker/u8:1 Not tainted 6.13.0-syzkaller-09793-g69b8923f5003 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Workqueue: ipv6_addrconf addrconf_dad_work RIP: 0010:ipv6_get_saddr_eval+0x511/0xf50 net/ipv6/addrconf.c:1666 Code: e8 03 42 80 3c 28 00 74 08 4c 89 f7 e8 98 a9 97 f7 48 89 6c 24 08 4d 8b 2e 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ef e8 71 a9 97 f7 41 be e0 00 00 00 4d 03 RSP: 0018:ffffc900001168b8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888024f99e40 RCX: dffffc0000000000 RDX: ffff88805fc0dc00 RSI: ffffffff8fdb28c0 RDI: ffffc900001169e8 RBP: 0000000000000006 R08: 0000000000000005 R09: ffffffff8a8bbc59 R10: 000000000000000b R11: ffff88801c285a00 R12: ffffc90000116a40 R13: 0000000000000000 R14: ffff88805fc0dd38 R15: 0000000000000006 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa3ddba7bac CR3: 0000000024428000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> __ipv6_dev_get_saddr+0x1d3/0x4b0 net/ipv6/addrconf.c:1753 ipv6_dev_get_saddr+0x555/0xc10 net/ipv6/addrconf.c:1889 ip6_route_get_saddr include/net/ip6_route.h:147 [inline] ip6_dst_lookup_tail+0xf18/0x14f0 net/ipv6/ip6_output.c:1133 ip6_dst_lookup_flow+0xb9/0x180 net/ipv6/ip6_output.c:1259 udp_tunnel6_dst_lookup+0x2be/0x520 net/ipv6/ip6_udp_tunnel.c:165 geneve6_xmit_skb drivers/net/geneve.c:950 [inline] geneve_xmit+0xcf2/0x2cf0 drivers/net/geneve.c:1036 __netdev_start_xmit include/linux/netdevice.h:5144 [inline] netdev_start_xmit include/linux/netdevice.h:5153 [inline] xmit_one net/core/dev.c:3735 [inline] dev_hard_start_xmit+0x27a/0x7d0 net/core/dev.c:3751 __dev_queue_xmit+0x1b73/0x3f50 net/core/dev.c:4584 dev_queue_xmit include/linux/netdevice.h:3305 [inline] neigh_hh_output include/net/neighbour.h:523 [inline] neigh_output include/net/neighbour.h:537 [inline] ip6_finish_output2+0x1263/0x1780 net/ipv6/ip6_output.c:141 ip6_finish_output+0x41e/0x840 net/ipv6/ip6_output.c:226 NF_HOOK+0x9e/0x430 include/linux/netfilter.h:314 mld_sendpack+0x843/0xdb0 net/ipv6/mcast.c:1862 ipv6_mc_dad_complete+0x88/0x490 net/ipv6/mcast.c:2288 addrconf_dad_completed+0x712/0xcd0 net/ipv6/addrconf.c:4336 addrconf_dad_work+0xdbc/0x16a0 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3317 worker_thread+0x870/0xd30 kernel/workqueue.c:3398 kthread+0x7a9/0x920 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ipv6_get_saddr_eval+0x511/0xf50 net/ipv6/addrconf.c:1666 Code: e8 03 42 80 3c 28 00 74 08 4c 89 f7 e8 98 a9 97 f7 48 89 6c 24 08 4d 8b 2e 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ef e8 71 a9 97 f7 41 be e0 00 00 00 4d 03 RSP: 0018:ffffc900001168b8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888024f99e40 RCX: dffffc0000000000 RDX: ffff88805fc0dc00 RSI: ffffffff8fdb28c0 RDI: ffffc900001169e8 RBP: 0000000000000006 R08: 0000000000000005 R09: ffffffff8a8bbc59 R10: 000000000000000b R11: ffff88801c285a00 R12: ffffc90000116a40 R13: 0000000000000000 R14: ffff88805fc0dd38 R15: 0000000000000006 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa3ddba7bac CR3: 0000000024428000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: e8 03 42 80 3c call 0x3c804208 5: 28 00 sub %al,(%rax) 7: 74 08 je 0x11 9: 4c 89 f7 mov %r14,%rdi c: e8 98 a9 97 f7 call 0xf797a9a9 11: 48 89 6c 24 08 mov %rbp,0x8(%rsp) 16: 4d 8b 2e mov (%r14),%r13 19: 4c 89 e8 mov %r13,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 ef mov %r13,%rdi 33: e8 71 a9 97 f7 call 0xf797a9a9 38: 41 be e0 00 00 00 mov $0xe0,%r14d 3e: 4d rex.WRB 3f: 03 .byte 0x3 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
