[syzbot] general protection fault in __blk_rq_map_sg

From: syzbot
Date: Sat Feb 04 2023 - 13:44:58 EST

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Hello,

syzbot found the following issue on:

HEAD commit: 80bd9028feca Add linux-next specific files for 20230131
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=17126969480000
kernel config: https://syzkaller.appspot.com/x/.config?x=904dc2f450eaad4a
dashboard link: https://syzkaller.appspot.com/bug?extid=0bbf896c8341c8e137c2
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1534e75d480000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/924618188238/disk-80bd9028.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/7a03cf86e545/vmlinux-80bd9028.xz
kernel image: https://storage.googleapis.com/syzbot-assets/568e80043a41/bzImage-80bd9028.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0bbf896c8341c8e137c2@xxxxxxxxxxxxxxxxxxxxxxxxx

general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 PID: 5252 Comm: syz-executor.2 Not tainted 6.2.0-rc6-next-20230131-syzkaller-09515-g80bd9028feca #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
RIP: 0010:sg_assign_page include/linux/scatterlist.h:109 [inline]
RIP: 0010:sg_set_page include/linux/scatterlist.h:139 [inline]
RIP: 0010:__blk_bvec_map_sg block/blk-merge.c:501 [inline]
RIP: 0010:__blk_bios_map_sg block/blk-merge.c:548 [inline]
RIP: 0010:__blk_rq_map_sg+0x36e/0xfd0 block/blk-merge.c:575
Code: 38 e8 36 5f 1a 00 48 89 c3 e8 9e 62 88 fd 48 8b 44 24 20 80 38 00 0f 85 fe 0b 00 00 48 8b 04 24 48 89 18 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 f3 0b 00 00 4c 8b 74 24 30 31 ff 48 8b 2b 41
RSP: 0018:ffffc9000428edf8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888019293a80 RSI: ffffffff83fc5382 RDI: 0000000000000007
RBP: ffff888021114bb8 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000a00
FS: 00007f50df7a5700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f50df784718 CR3: 0000000077767000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
scsi_alloc_sgtables+0x236/0xf70 drivers/scsi/scsi_lib.c:1048
sd_setup_read_write_cmnd drivers/scsi/sd.c:1136 [inline]
sd_init_command+0x67a/0x32a0 drivers/scsi/sd.c:1260
scsi_prepare_cmd drivers/scsi/scsi_lib.c:1603 [inline]
scsi_queue_rq+0x1e7b/0x3a40 drivers/scsi/scsi_lib.c:1737
blk_mq_dispatch_rq_list+0x710/0x23f0 block/blk-mq.c:2056
__blk_mq_do_dispatch_sched block/blk-mq-sched.c:173 [inline]
blk_mq_do_dispatch_sched+0x95e/0xc20 block/blk-mq-sched.c:187
__blk_mq_sched_dispatch_requests+0x26d/0x3e0 block/blk-mq-sched.c:313
blk_mq_sched_dispatch_requests+0x10a/0x190 block/blk-mq-sched.c:339
__blk_mq_run_hw_queue+0x2b7/0x480 block/blk-mq.c:2174
__blk_mq_delay_run_hw_queue+0x5f7/0x700 block/blk-mq.c:2250
blk_mq_run_hw_queue+0x3b5/0x560 block/blk-mq.c:2298
blk_mq_sched_insert_requests+0x1d9/0xb30 block/blk-mq-sched.c:493
blk_mq_dispatch_plug_list block/blk-mq.c:2758 [inline]
blk_mq_flush_plug_list+0x39c/0xe10 block/blk-mq.c:2800
__blk_flush_plug block/blk-core.c:1150 [inline]
blk_finish_plug block/blk-core.c:1174 [inline]
blk_finish_plug+0xbb/0x170 block/blk-core.c:1171
__iomap_dio_rw+0xf85/0x1d80 fs/iomap/direct-io.c:602
iomap_dio_rw+0x40/0xa0 fs/iomap/direct-io.c:682
ext4_dio_read_iter fs/ext4/file.c:94 [inline]
ext4_file_read_iter+0x4be/0x690 fs/ext4/file.c:145
call_read_iter include/linux/fs.h:1845 [inline]
generic_file_splice_read+0x182/0x4b0 fs/splice.c:309
do_splice_to+0x1b9/0x240 fs/splice.c:793
splice_direct_to_actor+0x2ab/0x8a0 fs/splice.c:865
do_splice_direct+0x1ab/0x280 fs/splice.c:974
do_sendfile+0xb19/0x12c0 fs/read_write.c:1255
__do_sys_sendfile64 fs/read_write.c:1323 [inline]
__se_sys_sendfile64 fs/read_write.c:1309 [inline]
__x64_sys_sendfile64+0x1d0/0x210 fs/read_write.c:1309
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f50dea8c0c9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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:00007f50df7a5168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f50debabf80 RCX: 00007f50dea8c0c9
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000003
RBP: 00007f50deae7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000001ff01 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffbb4e322f R14: 00007f50df7a5300 R15: 0000000000022000
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:sg_assign_page include/linux/scatterlist.h:109 [inline]
RIP: 0010:sg_set_page include/linux/scatterlist.h:139 [inline]
RIP: 0010:__blk_bvec_map_sg block/blk-merge.c:501 [inline]
RIP: 0010:__blk_bios_map_sg block/blk-merge.c:548 [inline]
RIP: 0010:__blk_rq_map_sg+0x36e/0xfd0 block/blk-merge.c:575
Code: 38 e8 36 5f 1a 00 48 89 c3 e8 9e 62 88 fd 48 8b 44 24 20 80 38 00 0f 85 fe 0b 00 00 48 8b 04 24 48 89 18 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 f3 0b 00 00 4c 8b 74 24 30 31 ff 48 8b 2b 41
RSP: 0018:ffffc9000428edf8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888019293a80 RSI: ffffffff83fc5382 RDI: 0000000000000007
RBP: ffff888021114bb8 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000a00
FS: 00007f50df7a5700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffdfee5f5d8 CR3: 0000000077767000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 38 e8 cmp %ch,%al
2: 36 5f ss pop %rdi
4: 1a 00 sbb (%rax),%al
6: 48 89 c3 mov %rax,%rbx
9: e8 9e 62 88 fd callq 0xfd8862ac
e: 48 8b 44 24 20 mov 0x20(%rsp),%rax
13: 80 38 00 cmpb $0x0,(%rax)
16: 0f 85 fe 0b 00 00 jne 0xc1a
1c: 48 8b 04 24 mov (%rsp),%rax
20: 48 89 18 mov %rbx,(%rax)
23: 48 89 d8 mov %rbx,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction
2f: 0f 85 f3 0b 00 00 jne 0xc28
35: 4c 8b 74 24 30 mov 0x30(%rsp),%r14
3a: 31 ff xor %edi,%edi
3c: 48 8b 2b mov (%rbx),%rbp
3f: 41 rex.B

---
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Next message: Vincenzo Palazzo: "Re: [RFC 1/5] rust: sync: impl Display for {Unique,}Arc"
Previous message: Alok Tiagi: "Re: [RFC] net: add new socket option SO_SETNETNS"
Next in thread: syzbot: "Re: [syzbot] general protection fault in __blk_rq_map_sg"
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