linux-kernel - BUG: unable to handle kernel paging request in scsi_device

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Date:   Thu, 15 Sep 2022 23:56:46 +0800
From:   Rondreis <linhaoguo86@...il.com>
To:     jejb@...ux.ibm.com, martin.petersen@...cle.com,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: BUG: unable to handle kernel paging request in scsi_device_unbusy

Hello,

When fuzzing the Linux kernel driver v6.0-rc4, the following crash was
triggered.

HEAD commit: 7e18e42e4b280c85b76967a9106a13ca61c16179
git tree: upstream

kernel config: https://pastebin.com/raw/xtrgsXP3
console output: https://pastebin.com/raw/T6bLnbiJ

Sorry I dont have any C reproducer on this bug, however, I would
appreciate it if you have any idea how to solve this bug.

The crash report is as follows:

BUG: unable to handle page fault for address: ffffed104565bc78
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 7ffd0067 P4D 7ffd0067 PUD 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 12256 Comm: usb-storage Not tainted 6.0.0-rc4+ #20
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.13.0-1ubuntu1.1 04/01/2014
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:85 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0xe0/0x190 mm/kasan/generic.c:189
Code: 80 38 00 74 ee 49 89 c0 b8 01 00 00 00 4d 85 c0 75 57 5b 5d 41
5c c3 4d 85 c9 74 71 49 01 d9 eb 09 48 83 c0 01 4c 39 c8 74 63 <80> 38
00 74 f2 eb d4 41 bc 08 00 00 00 45 29 c4 49 89 d8 4d 8d 0c
RSP: 0018:ffffc90018cbfd30 EFLAGS: 00010282
RAX: ffffed104565bc78 RBX: ffffed104565bc78 RCX: ffffffff84ab8eaa
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88822b2de3c0
RBP: ffffed104565bc79 R08: ffffffff84ab8e81 R09: ffffed104565bc79
R10: ffff88822b2de3c7 R11: ffffed104565bc78 R12: 000000000000003f
R13: ffff88806620b120 R14: 00000000ffffffff R15: ffff88806620b1f4
FS:  0000000000000000(0000) GS:ffff88802cc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffed104565bc78 CR3: 0000000056ea7000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 instrument_atomic_write include/linux/instrumented.h:86 [inline]
 set_bit include/asm-generic/bitops/instrumented-atomic.h:28 [inline]
 sbitmap_deferred_clear_bit include/linux/sbitmap.h:327 [inline]
 sbitmap_put include/linux/sbitmap.h:336 [inline]
 scsi_device_unbusy+0x1aa/0x380 drivers/scsi/scsi_lib.c:301
 scsi_finish_command+0x86/0x530 drivers/scsi/scsi.c:166
 scsi_complete+0x126/0x260 drivers/scsi/scsi_lib.c:1438
 blk_mq_complete_request_direct include/linux/blk-mq.h:814 [inline]
 scsi_done_internal+0x1de/0x490 drivers/scsi/scsi_lib.c:1627
 usb_stor_control_thread+0x72c/0x960 drivers/usb/storage/usb.c:420
 kthread+0x2e9/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>
Modules linked in:
CR2: ffffed104565bc78
---[ end trace 0000000000000000 ]---
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:85 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0xe0/0x190 mm/kasan/generic.c:189
Code: 80 38 00 74 ee 49 89 c0 b8 01 00 00 00 4d 85 c0 75 57 5b 5d 41
5c c3 4d 85 c9 74 71 49 01 d9 eb 09 48 83 c0 01 4c 39 c8 74 63 <80> 38
00 74 f2 eb d4 41 bc 08 00 00 00 45 29 c4 49 89 d8 4d 8d 0c
RSP: 0018:ffffc90018cbfd30 EFLAGS: 00010282
RAX: ffffed104565bc78 RBX: ffffed104565bc78 RCX: ffffffff84ab8eaa
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88822b2de3c0
RBP: ffffed104565bc79 R08: ffffffff84ab8e81 R09: ffffed104565bc79
R10: ffff88822b2de3c7 R11: ffffed104565bc78 R12: 000000000000003f
R13: ffff88806620b120 R14: 00000000ffffffff R15: ffff88806620b1f4
FS:  0000000000000000(0000) GS:ffff88802cc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffed104565bc78 CR3: 0000000056ea7000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
   0: 80 38 00              cmpb   $0x0,(%rax)
   3: 74 ee                je     0xfffffff3
   5: 49 89 c0              mov    %rax,%r8
   8: b8 01 00 00 00        mov    $0x1,%eax
   d: 4d 85 c0              test   %r8,%r8
  10: 75 57                jne    0x69
  12: 5b                    pop    %rbx
  13: 5d                    pop    %rbp
  14: 41 5c                pop    %r12
  16: c3                    retq
  17: 4d 85 c9              test   %r9,%r9
  1a: 74 71                je     0x8d
  1c: 49 01 d9              add    %rbx,%r9
  1f: eb 09                jmp    0x2a
  21: 48 83 c0 01          add    $0x1,%rax
  25: 4c 39 c8              cmp    %r9,%rax
  28: 74 63                je     0x8d
* 2a: 80 38 00              cmpb   $0x0,(%rax) <-- trapping instruction
  2d: 74 f2                je     0x21
  2f: eb d4                jmp    0x5
  31: 41 bc 08 00 00 00    mov    $0x8,%r12d
  37: 45 29 c4              sub    %r8d,%r12d
  3a: 49 89 d8              mov    %rbx,%r8
  3d: 4d                    rex.WRB
  3e: 8d                    .byte 0x8d
  3f: 0c                    .byte 0xc