[syzbot] [block?] general protection fault in bio_first_folio

From: syzbot
Date: Sat Dec 16 2023 - 00:20:37 EST

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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

---
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For information about bisection process see: https://goo.gl/tpsmEJ#bisection

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Next message: Manivannan Sadhasivam: "Re: [PATCH v5 0/2] bus: mhi: host: Add lock to avoid race when ringing channel DB"
Previous message: Manivannan Sadhasivam: "Re: [PATCH v5 2/2] bus: mhi: host: Drop chan lock before queuing buffers"
Next in thread: Matthew Wilcox: "Re: [syzbot] [block?] general protection fault in bio_first_folio"
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