general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]
CPU: 0 PID: 26251 Comm: syz-executor.5 Not tainted 5.15.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:cgroup_file_write+0xbe/0x790 kernel/cgroup/cgroup.c:3806
Code: 81 c3 48 08 00 00 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 f0 28 52 00 48 8b 1b 48 83 c3 40 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 d3 28 52 00 48 8b 03 48 89 44 24
RSP: 0018:ffffc9000312f2a0 EFLAGS: 00010202
RAX: 0000000000000008 RBX: 0000000000000040 RCX: ffff888088a03900
RDX: 0000000000000000 RSI: ffff888071c5e900 RDI: ffff888037117000
RBP: ffffc9000312f390 R08: ffffffff82071753 R09: fffffbfff1fa37f6
R10: fffffbfff1fa37f6 R11: 0000000000000000 R12: 1ffff92000625e5c
R13: ffff888037117000 R14: ffff888037117000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055a86d9d8228 CR3: 0000000019fad000 CR4: 00000000003506f0
Call Trace:
 kernfs_fop_write_iter+0x3b6/0x510 fs/kernfs/file.c:296
 __kernel_write+0x5d1/0xaf0 fs/read_write.c:539
 do_acct_process+0x112a/0x17b0 kernel/acct.c:519
 acct_pin_kill+0x27/0x130 kernel/acct.c:174
 pin_kill+0x2a6/0x940 fs/fs_pin.c:44
 mnt_pin_kill+0xc1/0x170 fs/fs_pin.c:81
 cleanup_mnt+0x4bc/0x510 fs/namespace.c:1130
 task_work_run+0x146/0x1c0 kernel/task_work.c:164
 exit_task_work include/linux/task_work.h:32 [inline]
 do_exit+0x6ff/0x24e0 kernel/exit.c:825
 do_group_exit+0x168/0x2d0 kernel/exit.c:922
 get_signal+0x16e0/0x20c0 kernel/signal.c:2868
 arch_do_signal_or_restart+0x9c/0x730 arch/x86/kernel/signal.c:865
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x191/0x220 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:300
 do_syscall_64+0x53/0xd0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7ff278685a39
Code: Unable to access opcode bytes at RIP 0x7ff278685a0f.
RSP: 002b:00007ff275bfb218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007ff278788f68 RCX: 00007ff278685a39
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007ff278788f68
RBP: 00007ff278788f60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff278788f6c
R13: 00007ffd84d7997f R14: 00007ff275bfb300 R15: 0000000000022000
Modules linked in:
---[ end trace 4904e42f4aa0dfe5 ]---
RIP: 0010:cgroup_file_write+0xbe/0x790 kernel/cgroup/cgroup.c:3806
Code: 81 c3 48 08 00 00 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 f0 28 52 00 48 8b 1b 48 83 c3 40 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 d3 28 52 00 48 8b 03 48 89 44 24
RSP: 0018:ffffc9000312f2a0 EFLAGS: 00010202
RAX: 0000000000000008 RBX: 0000000000000040 RCX: ffff888088a03900
RDX: 0000000000000000 RSI: ffff888071c5e900 RDI: ffff888037117000
RBP: ffffc9000312f390 R08: ffffffff82071753 R09: fffffbfff1fa37f6
R10: fffffbfff1fa37f6 R11: 0000000000000000 R12: 1ffff92000625e5c
R13: ffff888037117000 R14: ffff888037117000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d224000 CR3: 0000000036323000 CR4: 00000000003506e0
----------------
Code disassembly (best guess):
   0:	81 c3 48 08 00 00    	add    $0x848,%ebx
   6:	48 89 d8             	mov    %rbx,%rax
   9:	48 c1 e8 03          	shr    $0x3,%rax
   d:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1)
  12:	74 08                	je     0x1c
  14:	48 89 df             	mov    %rbx,%rdi
  17:	e8 f0 28 52 00       	callq  0x52290c
  1c:	48 8b 1b             	mov    (%rbx),%rbx
  1f:	48 83 c3 40          	add    $0x40,%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 d3 28 52 00       	callq  0x52290c
  39:	48 8b 03             	mov    (%rbx),%rax
  3c:	48                   	rex.W
  3d:	89                   	.byte 0x89
  3e:	44                   	rex.R
  3f:	24                   	.byte 0x24