Process accounting resumed
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
CPU: 1 UID: 0 PID: 15494 Comm: syz.1.2092 Not tainted 6.13.0-rc5-syzkaller-00004-gccb98ccef0e5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:proc_sctp_do_udp_port+0xcd/0x4a0 net/sctp/sysctl.c:530
Code: 03 42 80 3c 30 00 0f 85 b6 03 00 00 4d 8b a4 24 08 09 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d 7c 24 28 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 84 03 00 00 49 8d 7d 28 4d 8b 64 24 28 48 b8 00
RSP: 0018:ffffc9000499f508 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 1ffff92000933ea4 RCX: ffffc9000499f650
RDX: 0000000000000005 RSI: ffffffff8a680795 RDI: 0000000000000028
RBP: 0000000000000001 R08: ffffc9000499f740 R09: 0000000000000040
R10: 0000000000000040 R11: 0000000000003239 R12: 0000000000000000
R13: ffff8880618fd5e8 R14: dffffc0000000000 R15: ffffc9000499f740
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000497000 CR3: 000000007ce84000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 proc_sys_call_handler+0x403/0x5d0 fs/proc/proc_sysctl.c:601
 __kernel_write_iter+0x318/0xa80 fs/read_write.c:612
 __kernel_write+0xf6/0x140 fs/read_write.c:632
 do_acct_process+0xcb0/0x14a0 kernel/acct.c:539
 acct_pin_kill+0x2d/0x100 kernel/acct.c:192
 pin_kill+0x194/0x7c0 fs/fs_pin.c:44
 mnt_pin_kill+0x61/0x1e0 fs/fs_pin.c:81
 cleanup_mnt+0x3ac/0x450 fs/namespace.c:1366
 task_work_run+0x14e/0x250 kernel/task_work.c:239
 exit_task_work include/linux/task_work.h:43 [inline]
 do_exit+0xad8/0x2d70 kernel/exit.c:938
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1087
 get_signal+0x2576/0x2610 kernel/signal.c:3017
 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 irqentry_exit_to_user_mode+0x13f/0x280 kernel/entry/common.c:231
 asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:621
RIP: 0033:0x458
Code: Unable to access opcode bytes at 0x42e.
RSP: 002b:0000000000000adb EFLAGS: 00010206
RAX: 0000000000000000 RBX: 00007f80b5776080 RCX: 00007f80b5585d29
RDX: 0000000000000000 RSI: 0000000000000ad3 RDI: 0000000000003fff
RBP: 00007f80b5601b08 R08: 0000000000000002 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f80b5776080 R15: 00007ffcfe186fd8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:proc_sctp_do_udp_port+0xcd/0x4a0 net/sctp/sysctl.c:530
Code: 03 42 80 3c 30 00 0f 85 b6 03 00 00 4d 8b a4 24 08 09 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d 7c 24 28 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 84 03 00 00 49 8d 7d 28 4d 8b 64 24 28 48 b8 00
RSP: 0018:ffffc9000499f508 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 1ffff92000933ea4 RCX: ffffc9000499f650
RDX: 0000000000000005 RSI: ffffffff8a680795 RDI: 0000000000000028
RBP: 0000000000000001 R08: ffffc9000499f740 R09: 0000000000000040
R10: 0000000000000040 R11: 0000000000003239 R12: 0000000000000000
R13: ffff8880618fd5e8 R14: dffffc0000000000 R15: ffffc9000499f740
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000005a9000 CR3: 00000000508a0000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	03 42 80             	add    -0x80(%rdx),%eax
   3:	3c 30                	cmp    $0x30,%al
   5:	00 0f                	add    %cl,(%rdi)
   7:	85 b6 03 00 00 4d    	test   %esi,0x4d000003(%rsi)
   d:	8b a4 24 08 09 00 00 	mov    0x908(%rsp),%esp
  14:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  1b:	fc ff df
  1e:	49 8d 7c 24 28       	lea    0x28(%r12),%rdi
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 84 03 00 00    	jne    0x3b8
  34:	49 8d 7d 28          	lea    0x28(%r13),%rdi
  38:	4d 8b 64 24 28       	mov    0x28(%r12),%r12
  3d:	48                   	rex.W
  3e:	b8                   	.byte 0xb8