program:
r0 = fsopen(&(0x7f0000000140)='mqueue\x00', 0x0)
fsconfig$FSCONFIG_CMD_CREATE(r0, 0x6, 0x0, 0x0, 0x0)
r1 = fsmount(r0, 0x0, 0x0)
fchdir(r1)
r2 = fspick(0xffffffffffffff9c, &(0x7f0000000000)='.\x00', 0x0)
fsconfig$FSCONFIG_SET_FLAG(r2, 0x0, &(0x7f0000000040)='ro\x00', 0x0, 0x0)
fsconfig$FSCONFIG_CMD_RECONFIGURE(r2, 0x7, 0x0, 0x0, 0x0)
mq_open(&(0x7f00000004c0)='!\x7f\x00\xca\x00\x00\x00\f\x00\x00\x01E!T\xednux\x02\xc7\x12\xec\xca7\xbc\x1fS\x1c\x05y\x91\xe5\x9aL\xa9u\b\x00\x00\x00\xa0pC\x19\x9b\vY\x186\xa4\xe7\x1eg{`\xfa\xf3n\x8fIj6f\xfb\x13-g\x19(a6\x18\xe24nz\x83w8\xff\xfb\x83\f\x9a\xda\xc5w\x8eo\x02\xa3\xc1\x83\x91\xc6\xfd\x8c\xc4s\x03\x16\xa4+\xce|^\x98K_0\x8a\xb0\xff~\x1e\xd92\xb4r\xd8\xe7', 0x40, 0x110, 0x0)

[   85.487482][ T5343] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] SMP KASAN NOPTI
[   85.497052][ T5343] KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]
[   85.500996][ T5343] CPU: 0 UID: 0 PID: 5343 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
[   85.504644][ T5343] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
[   85.509354][ T5343] RIP: 0010:fd_install+0x57/0x3d0
[   85.511754][ T5343] Code: 48 81 c3 48 09 00 00 48 89 d8 48 c1 e8 03 80 3c 28 00 74 08 48 89 df e8 c7 4c e6 ff 4c 8b 3b 49 8d 5e 40 48 89 d8 48 c1 e8 03 <0f> b6 04 28 84 c0 0f 85 29 03 00 00 8b 1b 89 de 81 e6 00 00 00 01
[   85.519991][ T5343] RSP: 0018:ffffc9000d487ca0 EFLAGS: 00010202
[   85.522593][ T5343] RAX: 0000000000000008 RBX: 0000000000000041 RCX: 0000000000100000
[   85.526041][ T5343] RDX: ffffc9000f472000 RSI: 000000000000011b RDI: 000000000000011c
[   85.529394][ T5343] RBP: dffffc0000000000 R08: ffff88800083a523 R09: 1ffff110001074a4
[   85.532917][ T5343] R10: dffffc0000000000 R11: ffffed10001074a5 R12: 0000000000000006
[   85.536109][ T5343] R13: 0000000000000006 R14: 0000000000000001 R15: ffff88803e7e1a40
[   85.539665][ T5343] FS:  00007f6b41cd96c0(0000) GS:ffff88808d6ba000(0000) knlGS:0000000000000000
[   85.543572][ T5343] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   85.546483][ T5343] CR2: 00007f6b40fba190 CR3: 000000003057e000 CR4: 0000000000352ef0
[   85.549834][ T5343] Call Trace:
[   85.551247][ T5343]  <TASK>
[   85.552448][ T5343]  ? do_mq_open+0x595/0x770
[   85.554380][ T5343]  do_mq_open+0x5a0/0x770
[   85.556252][ T5343]  ? __pfx_do_mq_open+0x10/0x10
[   85.558354][ T5343]  ? rcu_is_watching+0x15/0xb0
[   85.560416][ T5343]  ? __rseq_handle_notify_resume+0x384/0x11d0
[   85.563139][ T5343]  __x64_sys_mq_open+0x16a/0x1c0
[   85.565353][ T5343]  ? __pfx___x64_sys_mq_open+0x10/0x10
[   85.567740][ T5343]  ? do_syscall_64+0xbe/0xf80
[   85.569814][ T5343]  do_syscall_64+0xfa/0xf80
[   85.571911][ T5343]  ? lockdep_hardirqs_on+0x98/0x140
[   85.574048][ T5343]  ? entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   85.576640][ T5343]  ? clear_bhb_loop+0x60/0xb0
[   85.578743][ T5343]  entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   85.581351][ T5343] RIP: 0033:0x7f6b40d8f7c9
[   85.583315][ T5343] Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
[   85.591941][ T5343] RSP: 002b:00007f6b41cd9038 EFLAGS: 00000246 ORIG_RAX: 00000000000000f0
[   85.595655][ T5343] RAX: ffffffffffffffda RBX: 00007f6b40fe5fa0 RCX: 00007f6b40d8f7c9
[   85.598978][ T5343] RDX: 0000000000000110 RSI: 0000000000000040 RDI: 00002000000004c0
[   85.602231][ T5343] RBP: 00007f6b40e13f91 R08: 0000000000000000 R09: 0000000000000000
[   85.605529][ T5343] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
[   85.610926][ T5343] R13: 00007f6b40fe6038 R14: 00007f6b40fe5fa0 R15: 00007ffcdb87b988
[   85.614035][ T5343]  </TASK>
[   85.615300][ T5343] Modules linked in:
[   85.617208][ T5343] ---[ end trace 0000000000000000 ]---
[   85.633552][ T5343] RIP: 0010:fd_install+0x57/0x3d0
[   85.637004][ T5343] Code: 48 81 c3 48 09 00 00 48 89 d8 48 c1 e8 03 80 3c 28 00 74 08 48 89 df e8 c7 4c e6 ff 4c 8b 3b 49 8d 5e 40 48 89 d8 48 c1 e8 03 <0f> b6 04 28 84 c0 0f 85 29 03 00 00 8b 1b 89 de 81 e6 00 00 00 01
[   85.644860][ T5343] RSP: 0018:ffffc9000d487ca0 EFLAGS: 00010202
[   85.647413][ T5343] RAX: 0000000000000008 RBX: 0000000000000041 RCX: 0000000000100000
[   85.650873][ T5343] RDX: ffffc9000f472000 RSI: 000000000000011b RDI: 000000000000011c
[   85.654564][ T5343] RBP: dffffc0000000000 R08: ffff88800083a523 R09: 1ffff110001074a4
[   85.658078][ T5343] R10: dffffc0000000000 R11: ffffed10001074a5 R12: 0000000000000006
[   85.661473][ T5343] R13: 0000000000000006 R14: 0000000000000001 R15: ffff88803e7e1a40
[   85.665767][ T5343] FS:  00007f6b41cd96c0(0000) GS:ffff88808d6ba000(0000) knlGS:0000000000000000
[   85.669737][ T5343] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   85.672736][ T5343] CR2: 00007f6b40fba190 CR3: 000000003057e000 CR4: 0000000000352ef0
[   85.677018][ T5343] Kernel panic - not syncing: Fatal exception
[   85.680517][ T5343] Kernel Offset: disabled
[   85.682421][ T5343] Rebooting in 86400 seconds..