kasan: CONFIG_KASAN_INLINE enabled
FAT-fs (loop0): bogus number of reserved sectors
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 21297 Comm: syz-executor.2 Not tainted 4.14.145 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
FAT-fs (loop0): Can't find a valid FAT filesystem
task: ffff8880607e2480 task.stack: ffff88805b608000
RIP: 0010:tcp_sendmsg_locked+0x50e/0x3200 net/ipv4/tcp.c:1281
RSP: 0018:ffff88805b60f9b0 EFLAGS: 00010206
RAX: 0000000000000012 RBX: 0000000000000000 RCX: ffffc90005e35000
kobject: 'loop4' (ffff8880a4a19260): kobject_uevent_env
RDX: 00000000000000ff RSI: ffffffff85240e44 RDI: 0000000000000090
RBP: ffff88805b60fb48 R08: 0000000000000001 R09: ffff8880607e2d20
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff8880949df840 R14: ffff88805b60fc28 R15: ffff88806bef2400
FS:  00007f370bc27700(0000) GS:ffff8880aef00000(0000) knlGS:0000000000000000
kobject: 'loop4' (ffff8880a4a19260): fill_kobj_path: path = '/devices/virtual/block/loop4'
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000625208 CR3: 000000008c7ab000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
kobject: 'loop4' (ffff8880a4a19260): kobject_uevent_env
kobject: 'loop4' (ffff8880a4a19260): fill_kobj_path: path = '/devices/virtual/block/loop4'
 tcp_sendmsg+0x30/0x50 net/ipv4/tcp.c:1457
 inet_sendmsg+0x122/0x500 net/ipv4/af_inet.c:762
kobject: 'loop4' (ffff8880a4a19260): kobject_uevent_env
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xce/0x110 net/socket.c:656
 sock_write_iter+0x21d/0x390 net/socket.c:925
kobject: 'loop4' (ffff8880a4a19260): fill_kobj_path: path = '/devices/virtual/block/loop4'
 call_write_iter include/linux/fs.h:1777 [inline]
 new_sync_write fs/read_write.c:469 [inline]
 __vfs_write+0x4a7/0x6b0 fs/read_write.c:482
kobject: 'loop4' (ffff8880a4a19260): kobject_uevent_env
kobject: 'loop4' (ffff8880a4a19260): fill_kobj_path: path = '/devices/virtual/block/loop4'
 vfs_write+0x198/0x500 fs/read_write.c:544
 SYSC_write fs/read_write.c:590 [inline]
 SyS_write+0xfd/0x230 fs/read_write.c:582
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x459a09
RSP: 002b:00007f370bc26c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459a09
RDX: 000000000000ffea RSI: 0000000020000100 RDI: 000000000000000b
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f370bc276d4
R13: 00000000004c9bc1 R14: 00000000004e1420 R15: 00000000ffffffff
Code: d4 38 fc 4d 85 ed 0f 84 40 08 00 00 e8 ac d4 38 fc 8b 85 78 ff ff ff 48 8d bb 90 00 00 00 89 85 50 ff ff ff 48 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 74 06 0f 8e 4a 25 00 00 f6 83 90 00 00 00 
RIP: tcp_sendmsg_locked+0x50e/0x3200 net/ipv4/tcp.c:1281 RSP: ffff88805b60f9b0
---[ end trace 19c57c58093f1734 ]---
kobject: 'loop3' (ffff8880a49e31e0): kobject_uevent_env