[syzbot] upstream boot error: general protection fault in scsi_alloc_sdev

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 568035b01cfb Linux 6.0-rc1
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17b23aa5080000
kernel config: https://syzkaller.appspot.com/x/.config?x=3b9175e0879a7749
dashboard link: https://syzkaller.appspot.com/bug?extid=9ada839c852179f13999
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9ada83...@syzkaller.appspotmail.com

scsi 0:0:1:0: Direct-Access Google PersistentDisk 1 PQ: 0 ANSI: 6
general protection fault, probably for non-canonical address 0xffff000000000800: 0000 [#1] PREEMPT SMP KASAN
KASAN: maybe wild-memory-access in range [0xfff8200000004000-0xfff8200000004007]
CPU: 1 PID: 56 Comm: kworker/u4:4 Not tainted 6.0.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Workqueue: events_unbound async_run_entry_fn
RIP: 0010:freelist_dereference mm/slub.c:347 [inline]
RIP: 0010:get_freepointer mm/slub.c:354 [inline]
RIP: 0010:get_freepointer_safe mm/slub.c:368 [inline]
RIP: 0010:slab_alloc_node mm/slub.c:3211 [inline]
RIP: 0010:slab_alloc mm/slub.c:3251 [inline]
RIP: 0010:__kmalloc+0x113/0x340 mm/slub.c:4420
Code: 8b 51 08 48 8b 01 48 83 79 10 00 48 89 44 24 08 0f 84 18 02 00 00 48 85 c0 0f 84 0f 02 00 00 48 8b 7d 00 8b 4d 28 40 f6 c7 0f <48> 8b 1c 08 0f 85 1b 02 00 00 48 8d 4a 08 65 48 0f c7 0f 0f 94 c0
RSP: 0018:ffffc900015777f8 EFLAGS: 00010246

RAX: ffff000000000000 RBX: ffff88801bd64000 RCX: 0000000000000800
RDX: 0000000000005d09 RSI: 0000000000000dc0 RDI: 000000000003dce0
RBP: ffff888011842140 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000dc0
R13: 0000000000000000 R14: 0000000000000cb8 R15: 0000000000000dc0
FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000000bc8e000 CR4: 0000000000350ee0
Call Trace:
<TASK>
kmalloc include/linux/slab.h:605 [inline]
kzalloc include/linux/slab.h:733 [inline]
scsi_alloc_sdev+0x109/0xcc0 drivers/scsi/scsi_scan.c:287
scsi_probe_and_add_lun+0x22be/0x3660 drivers/scsi/scsi_scan.c:1191
__scsi_scan_target+0x21f/0xdb0 drivers/scsi/scsi_scan.c:1673
scsi_scan_channel drivers/scsi/scsi_scan.c:1761 [inline]
scsi_scan_channel+0x148/0x1e0 drivers/scsi/scsi_scan.c:1737
scsi_scan_host_selected+0x2df/0x3b0 drivers/scsi/scsi_scan.c:1790
do_scsi_scan_host+0x1e8/0x260 drivers/scsi/scsi_scan.c:1929
do_scan_async+0x3e/0x500 drivers/scsi/scsi_scan.c:1939
async_run_entry_fn+0x98/0x530 kernel/async.c:127
process_one_work+0x991/0x1610 kernel/workqueue.c:2289
worker_thread+0x665/0x1080 kernel/workqueue.c:2436
kthread+0x2e4/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
</TASK>
Modules linked in:
----------------
Code disassembly (best guess):
0: 8b 51 08 mov 0x8(%rcx),%edx
3: 48 8b 01 mov (%rcx),%rax
6: 48 83 79 10 00 cmpq $0x0,0x10(%rcx)
b: 48 89 44 24 08 mov %rax,0x8(%rsp)
10: 0f 84 18 02 00 00 je 0x22e
16: 48 85 c0 test %rax,%rax
19: 0f 84 0f 02 00 00 je 0x22e
1f: 48 8b 7d 00 mov 0x0(%rbp),%rdi
23: 8b 4d 28 mov 0x28(%rbp),%ecx
26: 40 f6 c7 0f test $0xf,%dil
* 2a: 48 8b 1c 08 mov (%rax,%rcx,1),%rbx <-- trapping instruction
2e: 0f 85 1b 02 00 00 jne 0x24f
34: 48 8d 4a 08 lea 0x8(%rdx),%rcx
38: 65 48 0f c7 0f cmpxchg16b %gs:(%rdi)
3d: 0f 94 c0 sete %al


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[Guenter Roeck]

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git  fc4d146e8d7d25ef88d409bea1f2e9aff7f30635

[syzbot]

> #syz test https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git

I see the command but can't find the corresponding bug.
Please resend the email to syzbo...@syzkaller.appspotmail.com address
that is the sender of the bug report (also present in the Reported-by tag).

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[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-and-tested-by: syzbot+9ada83...@syzkaller.appspotmail.com

Tested on:

commit: fc4d146e virtio_net: Revert "virtio_net: set the defau..
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git

kernel config: https://syzkaller.appspot.com/x/.config?x=3b9175e0879a7749
dashboard link: https://syzkaller.appspot.com/bug?extid=9ada839c852179f13999
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Note: no patches were applied.
Note: testing is done by a robot and is best-effort only.

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-and-tested-by: syzbot+9ada83...@syzkaller.appspotmail.com

Tested on:

commit: 568035b0 Linux 6.0-rc1
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git v6.0-rc1

kernel config: https://syzkaller.appspot.com/x/.config?x=3b9175e0879a7749
dashboard link: https://syzkaller.appspot.com/bug?extid=9ada839c852179f13999
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

patch: https://syzkaller.appspot.com/x/patch.diff?x=118756f3080000

[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.