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5614622812f47-467f6368f86mr1381577b6e.42.1774046669559; Fri, 20 Mar 2026 15:44:29 -0700 (PDT) Date: Fri, 20 Mar 2026 15:44:29 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69bdcdcd.050a0220.3bf4de.0030.GAE@google.com> Subject: [syzbot] [block?] general protection fault in bio_add_page From: syzbot To: axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 8e42d2514a7e Add linux-next specific files for 20260318 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=139b34ba580000 kernel config: https://syzkaller.appspot.com/x/.config?x=1da705b17f2649a3 dashboard link: https://syzkaller.appspot.com/bug?extid=ed8bc247f231c1a48e21 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=108d7352580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/64c940773401/disk-8e42d251.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/aa7a94376665/vmlinux-8e42d251.xz kernel image: https://storage.googleapis.com/syzbot-assets/5a7ab603c859/bzImage-8e42d251.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ed8bc247f231c1a48e21@syzkaller.appspotmail.com 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: 35 Comm: kworker/u8:2 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Workqueue: writeback wb_workfn (flush-8:0) RIP: 0010:bvec_set_page include/linux/bvec.h:44 [inline] RIP: 0010:__bio_add_page block/bio.c:992 [inline] RIP: 0010:bio_add_page+0x462/0x6e0 block/bio.c:1048 Code: fd 48 8b 1b 48 8b 44 24 30 42 0f b6 04 30 84 c0 0f 85 c3 01 00 00 48 8b 14 24 0f b7 02 c1 e0 04 48 01 c3 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 0c 48 89 df e8 5f da a3 fd 48 8b 14 24 48 8b 44 RSP: 0000:ffffc90000ab6b80 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88801eac3d00 RDX: ffff88802cd6ea78 RSI: 00000000ffffefff RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffea0001b06147 R09: 1ffffd4000360c28 R10: dffffc0000000000 R11: fffff94000360c29 R12: 1ffff110059add4f R13: 0000000000001000 R14: dffffc0000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888124de1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9bc55ed6b8 CR3: 00000000769ea000 CR4: 00000000003526f0 Call Trace: bio_add_folio+0x64/0x90 block/bio.c:1084 io_submit_add_bh fs/ext4/page-io.c:465 [inline] ext4_bio_write_folio+0x1446/0x1ea0 fs/ext4/page-io.c:603 mpage_map_and_submit_buffers fs/ext4/inode.c:2326 [inline] mpage_map_and_submit_extent fs/ext4/inode.c:2516 [inline] ext4_do_writepages+0x207e/0x46e0 fs/ext4/inode.c:2928 ext4_writepages+0x241/0x3b0 fs/ext4/inode.c:3022 do_writepages+0x32e/0x550 mm/page-writeback.c:2554 __writeback_single_inode+0x133/0x11a0 fs/fs-writeback.c:1750 writeback_sb_inodes+0x992/0x1a20 fs/fs-writeback.c:2042 __writeback_inodes_wb+0x111/0x240 fs/fs-writeback.c:2118 wb_writeback+0x46a/0xb70 fs/fs-writeback.c:2229 wb_check_start_all fs/fs-writeback.c:2355 [inline] wb_do_writeback fs/fs-writeback.c:2381 [inline] wb_workfn+0x95b/0xf50 fs/fs-writeback.c:2414 process_one_work+0x9ab/0x1780 kernel/workqueue.c:3288 process_scheduled_works kernel/workqueue.c:3379 [inline] worker_thread+0xba8/0x11e0 kernel/workqueue.c:3465 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:bvec_set_page include/linux/bvec.h:44 [inline] RIP: 0010:__bio_add_page block/bio.c:992 [inline] RIP: 0010:bio_add_page+0x462/0x6e0 block/bio.c:1048 Code: fd 48 8b 1b 48 8b 44 24 30 42 0f b6 04 30 84 c0 0f 85 c3 01 00 00 48 8b 14 24 0f b7 02 c1 e0 04 48 01 c3 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 0c 48 89 df e8 5f da a3 fd 48 8b 14 24 48 8b 44 RSP: 0000:ffffc90000ab6b80 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88801eac3d00 RDX: ffff88802cd6ea78 RSI: 00000000ffffefff RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffea0001b06147 R09: 1ffffd4000360c28 R10: dffffc0000000000 R11: fffff94000360c29 R12: 1ffff110059add4f R13: 0000000000001000 R14: dffffc0000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888124ee1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005577be56a168 CR3: 000000002552e000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: fd std 1: 48 8b 1b mov (%rbx),%rbx 4: 48 8b 44 24 30 mov 0x30(%rsp),%rax 9: 42 0f b6 04 30 movzbl (%rax,%r14,1),%eax e: 84 c0 test %al,%al 10: 0f 85 c3 01 00 00 jne 0x1d9 16: 48 8b 14 24 mov (%rsp),%rdx 1a: 0f b7 02 movzwl (%rdx),%eax 1d: c1 e0 04 shl $0x4,%eax 20: 48 01 c3 add %rax,%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) <-- trapping instruction 2f: 74 0c je 0x3d 31: 48 89 df mov %rbx,%rdi 34: e8 5f da a3 fd call 0xfda3da98 39: 48 8b 14 24 mov (%rsp),%rdx 3d: 48 rex.W 3e: 8b .byte 0x8b 3f: 44 rex.R --- 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. 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