blktrace: Concurrent blktraces are not allowed on sg0
blktrace: Concurrent blktraces are not allowed on sg0
==================================================================
BUG: KASAN: use-after-free in memcpy include/linux/string.h:377 [inline]
BUG: KASAN: use-after-free in skb_put_data include/linux/skbuff.h:2130 [inline]
BUG: KASAN: use-after-free in bcm_can_tx+0x3d4/0x800 net/can/bcm.c:295
Read of size 72 at addr ffff8880aa782540 by task migration/1/17

CPU: 1 PID: 17 Comm: migration/1 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354
 kasan_report+0x8f/0xa0 mm/kasan/report.c:412
 memcpy+0x20/0x50 mm/kasan/kasan.c:302
 memcpy include/linux/string.h:377 [inline]
 skb_put_data include/linux/skbuff.h:2130 [inline]
 bcm_can_tx+0x3d4/0x800 net/can/bcm.c:295
 bcm_tx_timeout_tsklet+0x1f0/0x3a0 net/can/bcm.c:414
 tasklet_action_common.constprop.0+0x265/0x360 kernel/softirq.c:522
 __do_softirq+0x265/0x980 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:372 [inline]
 irq_exit+0x215/0x260 kernel/softirq.c:412
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1098
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
 </IRQ>
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x50/0x80 kernel/locking/spinlock.c:192
Code: c0 98 82 f1 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 31 48 83 3d 01 31 d8 01 00 74 25 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 26 1b 28 f9 65 8b 05 9f 8d e8 77 85 c0 74 02 5d
RSP: 0018:ffff8880b5ac7d28 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff13e3053 RBX: ffff8880b5ab8480 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffff8880b5ab8d04
RBP: ffff8880ba12b0c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880ba12b0c0
R13: ffff8880a526c300 R14: 0000000000000000 R15: 0000000000000000
 finish_lock_switch kernel/sched/core.c:2578 [inline]
 finish_task_switch+0x146/0x760 kernel/sched/core.c:2678
 context_switch kernel/sched/core.c:2831 [inline]
 __schedule+0x88f/0x2040 kernel/sched/core.c:3517
 schedule+0x8d/0x1b0 kernel/sched/core.c:3561
 smpboot_thread_fn+0x328/0x9e0 kernel/smpboot.c:160
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

Allocated by task 20129:
 __do_kmalloc mm/slab.c:3727 [inline]
 __kmalloc+0x15a/0x3c0 mm/slab.c:3736
 kmalloc_array include/linux/slab.h:637 [inline]
 bcm_tx_setup net/can/bcm.c:957 [inline]
 bcm_sendmsg+0x316c/0x4150 net/can/bcm.c:1386
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg+0xc3/0x120 net/socket.c:661
 ___sys_sendmsg+0x7bb/0x8e0 net/socket.c:2227
 __sys_sendmsg net/socket.c:2265 [inline]
 __do_sys_sendmsg net/socket.c:2274 [inline]
 __se_sys_sendmsg net/socket.c:2272 [inline]
 __x64_sys_sendmsg+0x132/0x220 net/socket.c:2272
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 20126:
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xcc/0x210 mm/slab.c:3822
 bcm_remove_op+0x213/0x2c0 net/can/bcm.c:770
 bcm_release+0x260/0x950 net/can/bcm.c:1561
 __sock_release+0xcd/0x2a0 net/socket.c:599
 sock_close+0x15/0x20 net/socket.c:1214
 __fput+0x2ce/0x890 fs/file_table.c:278
 task_work_run+0x148/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:193 [inline]
 exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
 do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8880aa7820c0
 which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 1152 bytes inside of
 2048-byte region [ffff8880aa7820c0, ffff8880aa7828c0)
The buggy address belongs to the page:
page:ffffea0002a9e080 count:1 mapcount:0 mapping:ffff88813bff0c40 index:0x0 compound_mapcount: 0
flags: 0xfff00000008100(slab|head)
raw: 00fff00000008100 ffffea00024a7c88 ffffea0002bbae08 ffff88813bff0c40
raw: 0000000000000000 ffff8880aa7820c0 0000000100000003 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880aa782400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880aa782480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880aa782500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff8880aa782580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880aa782600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess), 5 bytes skipped:
   0:	48 ba 00 00 00 00 00 	movabs $0xdffffc0000000000,%rdx
   7:	fc ff df
   a:	48 c1 e8 03          	shr    $0x3,%rax
   e:	80 3c 10 00          	cmpb   $0x0,(%rax,%rdx,1)
  12:	75 31                	jne    0x45
  14:	48 83 3d 01 31 d8 01 	cmpq   $0x0,0x1d83101(%rip)        # 0x1d8311d
  1b:	00
  1c:	74 25                	je     0x43
  1e:	fb                   	sti
  1f:	66 0f 1f 44 00 00    	nopw   0x0(%rax,%rax,1)
* 25:	bf 01 00 00 00       	mov    $0x1,%edi <-- trapping instruction
  2a:	e8 26 1b 28 f9       	callq  0xf9281b55
  2f:	65 8b 05 9f 8d e8 77 	mov    %gs:0x77e88d9f(%rip),%eax        # 0x77e88dd5
  36:	85 c0                	test   %eax,%eax
  38:	74 02                	je     0x3c
  3a:	5d                   	pop    %rbp