program:
mkdirat(0xffffffffffffff9c, &(0x7f0000000000)='./config\x00', 0x1ff)
mount(0x0, &(0x7f0000000000)='./config\x00', &(0x7f0000000040)='configfs\x00', 0x0, 0x0)
mkdirat(0xffffffffffffff9c, &(0x7f0000000000)='./config/usb_gadget/g1\x00', 0x1ff)
mkdirat(0xffffffffffffff9c, &(0x7f0000000000)='./config/usb_gadget/g1/functions/mass_storage.usb0\x00', 0x1ff)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000000)='./config/usb_gadget/g1/functions/mass_storage.usb0/num_buffers\x00', 0x1, 0x0)
sendmsg$ETHTOOL_MSG_LINKMODES_SET(0xffffffffffffffff, 0x0, 0x0)
write$RDMA_USER_CM_CMD_GET_EVENT(r0, &(0x7f0000000400)={0x30, 0x8, 0xfa00, {0x0}}, 0x10)

[   94.403501][ T4642] Bluetooth: hci0: command tx timeout
[   94.511399][ T5319] Mass Storage Function, version: 2009/09/11
[   94.519455][ T5319] LUN: removable file: (no medium)
[   94.544814][ T5319] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] SMP KASAN NOPTI
[   94.550032][ T5319] KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
[   94.555607][ T5319] CPU: 0 UID: 0 PID: 5319 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
[   94.559918][ T5319] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   94.563706][ T5319] RIP: 0010:fsg_common_set_num_buffers+0x61/0x2c0
[   94.566291][ T5319] Code: ab 01 00 00 49 89 c6 49 bd 00 00 00 00 00 fc ff df bf 00 40 00 00 be c0 0c 00 00 e8 49 5d 64 fa 48 89 c3 4c 89 f0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 f7 e8 40 2b 70 fa 49 89 1e 48 85 db 0f
[   94.575616][ T5319] RSP: 0018:ffffc9000f40fb50 EFLAGS: 00010202
[   94.578582][ T5319] RAX: 0000000000000002 RBX: ffff888050dc4000 RCX: 0000000080000001
[   94.582149][ T5319] RDX: 0000000000004000 RSI: ffffffff8c4bce60 RDI: ffffffff8c4bce20
[   94.585368][ T5319] RBP: ffffc9000f40fc48 R08: 0000000000000cc0 R09: 00000000ffffffff
[   94.589753][ T5319] R10: ffffed100a1b9000 R11: ffffffff8eb59c60 R12: 0000000000000000
[   94.593755][ T5319] R13: dffffc0000000000 R14: 0000000000000010 R15: ffff88801fcdc000
[   94.597327][ T5319] FS:  00007fc486c1f6c0(0000) GS:ffff88808c54a000(0000) knlGS:0000000000000000
[   94.600740][ T5319] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   94.603420][ T5319] CR2: 00007fc48601be00 CR3: 000000004090b000 CR4: 0000000000352ef0
[   94.606853][ T5319] Call Trace:
[   94.608550][ T5319]  <TASK>
[   94.610427][ T5319]  fsg_opts_num_buffers_store+0x13d/0x1c0
[   94.613542][ T5319]  ? __pfx_fsg_opts_num_buffers_store+0x10/0x10
[   94.616045][ T5319]  ? down_read+0x2be/0x330
[   94.618107][ T5319]  ? __pfx_fsg_opts_num_buffers_store+0x10/0x10
[   94.620923][ T5319]  configfs_write_iter+0x337/0x430
[   94.623493][ T5319]  vfs_write+0x612/0xba0
[   94.625848][ T5319]  ? __pfx_vfs_write+0x10/0x10
[   94.628324][ T5319]  ? __fget_files+0x2a/0x420
[   94.630531][ T5319]  ksys_write+0x150/0x270
[   94.632435][ T5319]  ? __pfx_ksys_write+0x10/0x10
[   94.634574][ T5319]  ? entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   94.637229][ T5319]  do_syscall_64+0x174/0x580
[   94.639764][ T5319]  ? clear_bhb_loop+0x70/0xc0
[   94.642613][ T5319]  entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   94.645811][ T5319] RIP: 0033:0x7fc485d9e0d9
[   94.647795][ T5319] Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
[   94.656203][ T5319] RSP: 002b:00007fc486c1efe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   94.659986][ T5319] RAX: ffffffffffffffda RBX: 00007fc486025fa0 RCX: 00007fc485d9e0d9
[   94.664300][ T5319] RDX: 0000000000000010 RSI: 0000200000000400 RDI: 0000000000000003
[   94.668943][ T5319] RBP: 00007fc485e35024 R08: 0000000000000000 R09: 0000000000000000
[   94.672467][ T5319] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
[   94.676275][ T5319] R13: 00007fc486026038 R14: 00007fc486025fa0 R15: 00007ffde0f80518
[   94.681540][ T5319]  </TASK>
[   94.683640][ T5319] Modules linked in:
[   94.686104][ T5319] ---[ end trace 0000000000000000 ]---
[   94.698097][ T5319] RIP: 0010:fsg_common_set_num_buffers+0x61/0x2c0
[   94.702443][ T5319] Code: ab 01 00 00 49 89 c6 49 bd 00 00 00 00 00 fc ff df bf 00 40 00 00 be c0 0c 00 00 e8 49 5d 64 fa 48 89 c3 4c 89 f0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 f7 e8 40 2b 70 fa 49 89 1e 48 85 db 0f
[   94.711939][ T5319] RSP: 0018:ffffc9000f40fb50 EFLAGS: 00010202
[   94.715927][ T5319] RAX: 0000000000000002 RBX: ffff888050dc4000 RCX: 0000000080000001
[   94.719869][ T5319] RDX: 0000000000004000 RSI: ffffffff8c4bce60 RDI: ffffffff8c4bce20
[   94.723550][ T5319] RBP: ffffc9000f40fc48 R08: 0000000000000cc0 R09: 00000000ffffffff
[   94.727056][ T5319] R10: ffffed100a1b9000 R11: ffffffff8eb59c60 R12: 0000000000000000
[   94.732282][ T5319] R13: dffffc0000000000 R14: 0000000000000010 R15: ffff88801fcdc000
[   94.736966][ T5319] FS:  00007fc486c1f6c0(0000) GS:ffff88808c54a000(0000) knlGS:0000000000000000
[   94.740549][ T5319] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   94.743116][ T5319] CR2: 00007fc486c28230 CR3: 000000004090b000 CR4: 0000000000352ef0
[   94.746151][ T5319] Kernel panic - not syncing: Fatal exception
[   94.749527][ T5319] Kernel Offset: disabled
[   94.752090][ T5319] Rebooting in 86400 seconds..