syzbot


upstream boot error: general protection fault in scsi_alloc_sdev

Status: upstream: reported on 2022/08/15 17:59
Reported-by: syzbot+9ada839c852179f13999@syzkaller.appspotmail.com
First crash: 49d, last: 47d
Patch testing requests:
Created Duration User Patch Repo Result
2022/08/15 19:21 9m linux@roeck-us.net patch git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git v6.0-rc1 OK
2022/08/15 18:15 9m linux@roeck-us.net https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git fc4d146e8d7d25ef88d409bea1f2e9aff7f30635 OK

Sample crash report:
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

Crashes (2):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-root 2022/08/15 08:49 upstream 568035b01cfb 8dfcaa3d .config log report upstream boot error: general protection fault in scsi_alloc_sdev
ci-upstream-kasan-gce-386 2022/08/17 02:17 upstream 3cc40a443a04 7a7cb304 .config log report upstream boot error: general protection fault in scsi_alloc_sdev
* Struck through repros no longer work on HEAD.