Hello, syzbot found the following issue on: HEAD commit: abb240f7a2bd Add linux-next specific files for 20231212 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=1673c8aee80000 kernel config: https://syzkaller.appspot.com/x/.config?x=cc2485c21b49ddc4 dashboard link: https://syzkaller.appspot.com/bug?extid=8b23309d5788a79d3eea compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11627092e80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13274512e80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/795a3560ea0e/disk-abb240f7.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/17a88d6802ed/vmlinux-abb240f7.xz kernel image: https://storage.googleapis.com/syzbot-assets/bfcdd0049f21/bzImage-abb240f7.xz The issue was bisected to: commit 1b151e2435fc3a9b10c8946c6aebe9f3e1938c55 Author: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx> Date: Mon Aug 14 14:41:00 2023 +0000 block: Remove special-casing of compound pages bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=152f8a8ee80000 final oops: https://syzkaller.appspot.com/x/report.txt?x=172f8a8ee80000 console output: https://syzkaller.appspot.com/x/log.txt?x=132f8a8ee80000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+8b23309d5788a79d3eea@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 1b151e2435fc ("block: Remove special-casing of compound pages") general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 0 PID: 5059 Comm: syz-executor696 Not tainted 6.7.0-rc5-next-20231212-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 RIP: 0010:_compound_head include/linux/page-flags.h:247 [inline] RIP: 0010:bio_first_folio+0xcb/0x5c0 include/linux/bio.h:289 Code: 48 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 76 04 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 6d 00 49 8d 7d 08 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 49 04 00 00 4d 8b 7d 08 31 ff 4d 89 fc 41 83 e4 RSP: 0018:ffffc900039ef448 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffffc900039ef4e8 RCX: ffffffff8444f4bd RDX: 0000000000000001 RSI: ffffffff8444f4cb RDI: 0000000000000008 RBP: ffff88801dad0888 R08: 0000000000000003 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88801dad0800 R13: 0000000000000000 R14: 0000000000000000 R15: ffff88801dad0800 FS: 0000555556ace380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000005fdeb8 CR3: 000000007c5b7000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> __bio_release_pages+0x9d/0x4b0 block/bio.c:1150 bio_release_pages include/linux/bio.h:508 [inline] bio_map_user_iov+0x8ee/0xa60 block/blk-map.c:347 blk_rq_map_user_iov+0x6a5/0x1840 block/blk-map.c:663 blk_rq_map_user block/blk-map.c:690 [inline] blk_rq_map_user_io+0x202/0x230 block/blk-map.c:723 sg_io+0x537/0xd70 drivers/scsi/scsi_ioctl.c:456 scsi_cdrom_send_packet+0x276/0x640 drivers/scsi/scsi_ioctl.c:820 scsi_ioctl+0x146/0x1840 drivers/scsi/scsi_ioctl.c:903 sg_ioctl+0xb7b/0x2760 drivers/scsi/sg.c:1163 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl fs/ioctl.c:857 [inline] __x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x62/0x6a RIP: 0033:0x7f9970983229 Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffda6357b98 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ffda6357d68 RCX: 00007f9970983229 RDX: 0000000020000000 RSI: 0000000000005393 RDI: 0000000000000004 RBP: 00007f99709f6610 R08: 00007ffda6357d68 R09: 00007ffda6357d68 R10: 002367732f766564 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffda6357d58 R14: 0000000000000001 R15: 0000000000000001 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:_compound_head include/linux/page-flags.h:247 [inline] RIP: 0010:bio_first_folio+0xcb/0x5c0 include/linux/bio.h:289 Code: 48 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 76 04 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 6d 00 49 8d 7d 08 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 49 04 00 00 4d 8b 7d 08 31 ff 4d 89 fc 41 83 e4 RSP: 0018:ffffc900039ef448 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffffc900039ef4e8 RCX: ffffffff8444f4bd RDX: 0000000000000001 RSI: ffffffff8444f4cb RDI: 0000000000000008 RBP: ffff88801dad0888 R08: 0000000000000003 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88801dad0800 R13: 0000000000000000 R14: 0000000000000000 R15: ffff88801dad0800 FS: 0000555556ace380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000005fdeb8 CR3: 000000007c5b7000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 48 89 ea mov %rbp,%rdx 3: 48 c1 ea 03 shr $0x3,%rdx 7: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) b: 0f 85 76 04 00 00 jne 0x487 11: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 18: fc ff df 1b: 4c 8b 6d 00 mov 0x0(%rbp),%r13 1f: 49 8d 7d 08 lea 0x8(%r13),%rdi 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 49 04 00 00 jne 0x47d 34: 4d 8b 7d 08 mov 0x8(%r13),%r15 38: 31 ff xor %edi,%edi 3a: 4d 89 fc mov %r15,%r12 3d: 41 rex.B 3e: 83 .byte 0x83 3f: e4 .byte 0xe4 --- 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
