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AJvYcCW0B0mHwUV9hkBoAi8sc/FbONvtFPgFrbeyHWIQnDSXR9jSe1aCyyA6bjpO5d22j6phqeN9golYFKBDPQ==@vger.kernel.org X-Gm-Message-State: AOJu0YxHFRyecgwtphWsq783bKKfzekzIQ9j/6HmleisHuGBpFHPomH8 GSv84sdVmKfBWXiveO/etdKHVv4gvx491UVoQpGFajFQXuxcDGdPCB/ErDS9U0HtVPeNMUuKHjD 6DWVW5SeoHUJRhHaTrUUv1zpZYnTlqGqdYqAfCCQkYJ6FR6ZaFyvVp9On56g= X-Google-Smtp-Source: AGHT+IH5V2rpFeoWBuoKCg4AtOsjU2L+qVO9/rAczCVE1fduQ7VrXGv7gycv5dhBcSh1sf0UKoVWSjGOAhdajdNtKZbmFLpW6YOO Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6602:4a0c:b0:948:b49f:c859 with SMTP id ca18e2360f4ac-948e0cd3c73mr289335839f.4.1763097870359; Thu, 13 Nov 2025 21:24:30 -0800 (PST) Date: Thu, 13 Nov 2025 21:24:30 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6916bd0e.a70a0220.3124cb.0046.GAE@google.com> Subject: [syzbot] [block?] general protection fault in bio_seg_gap From: syzbot To: axboe@kernel.dk, hch@lst.de, kbusch@kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, martin.petersen@oracle.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: ab40c92c74c6 Add linux-next specific files for 20251110 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=12e2317c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=b4c0e7075df4bf51 dashboard link: https://syzkaller.appspot.com/bug?extid=8df17e797225d69050d4 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11527084580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13e1b412580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/63d584f3f4ab/disk-ab40c92c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/4bb564de81d2/vmlinux-ab40c92c.xz kernel image: https://storage.googleapis.com/syzbot-assets/704d37065029/bzImage-ab40c92c.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/c9f9c8e46d00/mount_0.gz fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=14ec87cd980000) The issue was bisected to: commit 2f6b2565d43cdb5087cac23d530cca84aa3d897e Author: Keith Busch Date: Tue Oct 14 15:04:55 2025 +0000 block: accumulate memory segment gaps per bio bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1197b0b4580000 final oops: https://syzkaller.appspot.com/x/report.txt?x=1397b0b4580000 console output: https://syzkaller.appspot.com/x/log.txt?x=1597b0b4580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+8df17e797225d69050d4@syzkaller.appspotmail.com Fixes: 2f6b2565d43c ("block: accumulate memory segment gaps per bio") ======================================================= WARNING: The mand mount option has been deprecated and and is ignored by this kernel. Remove the mand option from the mount to silence this warning. ======================================================= EXT4-fs: Ignoring removed i_version option Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 UID: 0 PID: 6018 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:bio_get_first_bvec block/blk-merge.c:22 [inline] RIP: 0010:bio_get_last_bvec block/blk-merge.c:30 [inline] RIP: 0010:bio_seg_gap+0x1c6/0x7d0 block/blk-merge.c:743 Code: fd 48 ba 00 00 00 00 00 fc ff df 49 8b 06 48 89 5c 24 20 49 89 de 49 c1 e6 04 48 89 44 24 08 4a 8d 2c 30 48 89 e8 48 c1 e8 03 <80> 3c 10 00 74 12 48 89 ef e8 0c 33 b9 fd 48 ba 00 00 00 00 00 fc RSP: 0018:ffffc90003036a60 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff8880788e5b80 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff8880786a1030 RBP: 0000000000000000 R08: ffff888141f6d877 R09: 1ffff110283edb0e R10: dffffc0000000000 R11: ffffed10283edb0f R12: 0000000000000400 R13: 0000000000000000 R14: 0000000000000000 R15: ffff8880786a1000 FS: 0000555589f40500(0000) GS:ffff888125ecd000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe080ddae9c CR3: 00000000745c6000 CR4: 00000000003526f0 Call Trace: bio_attempt_back_merge+0x4ba/0x920 block/blk-merge.c:940 blk_attempt_plug_merge+0x145/0x1d0 block/blk-merge.c:1073 blk_mq_attempt_bio_merge block/blk-mq.c:3022 [inline] blk_mq_submit_bio+0x1abd/0x26d0 block/blk-mq.c:3186 __submit_bio+0x207/0x5a0 block/blk-core.c:637 __submit_bio_noacct_mq block/blk-core.c:724 [inline] submit_bio_noacct_nocheck+0x2fb/0xa50 block/blk-core.c:755 submit_bio_wait+0x104/0x200 block/bio.c:1389 blkdev_issue_discard+0x113/0x1b0 block/blk-lib.c:95 ext4_mb_clear_bb fs/ext4/mballoc.c:6620 [inline] ext4_free_blocks+0xce2/0x1bf0 fs/ext4/mballoc.c:6770 ext4_clear_blocks+0x372/0x3f0 fs/ext4/indirect.c:888 ext4_free_data fs/ext4/indirect.c:962 [inline] ext4_ind_truncate+0x701/0xb30 fs/ext4/indirect.c:1154 ext4_truncate+0xb24/0x12e0 fs/ext4/inode.c:4620 ext4_evict_inode+0x86e/0xe80 fs/ext4/inode.c:260 evict+0x5f4/0xae0 fs/inode.c:837 ext4_orphan_cleanup+0xc20/0x1460 fs/ext4/orphan.c:470 __ext4_fill_super fs/ext4/super.c:5618 [inline] ext4_fill_super+0x5920/0x61e0 fs/ext4/super.c:5737 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1697 vfs_get_tree+0x92/0x2b0 fs/super.c:1757 fc_mount fs/namespace.c:1198 [inline] do_new_mount_fc fs/namespace.c:3641 [inline] do_new_mount+0x302/0xa10 fs/namespace.c:3717 do_mount fs/namespace.c:4040 [inline] __do_sys_mount fs/namespace.c:4228 [inline] __se_sys_mount+0x313/0x410 fs/namespace.c:4205 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f74a6990e6a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd3db28e18 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffd3db28ea0 RCX: 00007f74a6990e6a RDX: 0000200000000ac0 RSI: 0000200000000240 RDI: 00007ffd3db28e60 RBP: 0000200000000ac0 R08: 00007ffd3db28ea0 R09: 0000000003810744 R10: 0000000003810744 R11: 0000000000000246 R12: 0000200000000240 R13: 00007ffd3db28e60 R14: 0000000000000453 R15: 000000000000002c Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:bio_get_first_bvec block/blk-merge.c:22 [inline] RIP: 0010:bio_get_last_bvec block/blk-merge.c:30 [inline] RIP: 0010:bio_seg_gap+0x1c6/0x7d0 block/blk-merge.c:743 Code: fd 48 ba 00 00 00 00 00 fc ff df 49 8b 06 48 89 5c 24 20 49 89 de 49 c1 e6 04 48 89 44 24 08 4a 8d 2c 30 48 89 e8 48 c1 e8 03 <80> 3c 10 00 74 12 48 89 ef e8 0c 33 b9 fd 48 ba 00 00 00 00 00 fc RSP: 0018:ffffc90003036a60 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff8880788e5b80 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff8880786a1030 RBP: 0000000000000000 R08: ffff888141f6d877 R09: 1ffff110283edb0e R10: dffffc0000000000 R11: ffffed10283edb0f R12: 0000000000000400 R13: 0000000000000000 R14: 0000000000000000 R15: ffff8880786a1000 FS: 0000555589f40500(0000) GS:ffff888125ecd000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe080ddae9c CR3: 00000000745c6000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: fd std 1: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 8: fc ff df b: 49 8b 06 mov (%r14),%rax e: 48 89 5c 24 20 mov %rbx,0x20(%rsp) 13: 49 89 de mov %rbx,%r14 16: 49 c1 e6 04 shl $0x4,%r14 1a: 48 89 44 24 08 mov %rax,0x8(%rsp) 1f: 4a 8d 2c 30 lea (%rax,%r14,1),%rbp 23: 48 89 e8 mov %rbp,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 10 00 cmpb $0x0,(%rax,%rdx,1) <-- trapping instruction 2e: 74 12 je 0x42 30: 48 89 ef mov %rbp,%rdi 33: e8 0c 33 b9 fd call 0xfdb93344 38: 48 rex.W 39: ba 00 00 00 00 mov $0x0,%edx 3e: 00 fc add %bh,%ah --- 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@googlegroups.com. 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