------------[ cut here ]------------
FAT-fs (loop2): Directory bread(block 154) failed
WARNING: CPU: 0 PID: 29276 at net/kcm/kcmsock.c:629 kcm_write_msgs.cold+0x112/0x13f net/kcm/kcmsock.c:629
FAT-fs (loop2): Directory bread(block 155) failed
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 29276 Comm: syz-executor.3 Not tainted 4.19.197-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 panic+0x26a/0x50e kernel/panic.c:186
 __warn.cold+0x20/0x5a kernel/panic.c:541
 report_bug+0x262/0x2b0 lib/bug.c:183
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x1d7/0x310 arch/x86/kernel/traps.c:296
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038
RIP: 0010:kcm_write_msgs.cold+0x112/0x13f net/kcm/kcmsock.c:629
Code: c7 44 24 58 00 00 00 00 48 8b 80 50 02 00 00 48 89 44 24 28 e9 24 a9 4a ff e8 a3 89 4f f9 48 c7 c7 20 20 62 89 e8 cd f5 df ff <0f> 0b 8b 44 24 70 41 bc ea ff ff ff 89 44 24 58 e9 fe a9 4a ff e8
RSP: 0018:ffff88803118f828 EFLAGS: 00010282
RAX: 0000000000000024 RBX: 00000000000000c0 RCX: 0000000000000000
RDX: 00000000000122bf RSI: ffffffff814dfcc1 RDI: ffffed1006231ef7
RBP: ffff8880a114a3c0 R08: 0000000000000024 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000008000
R13: ffff888098ab3a00 R14: ffff8880a114a300 R15: 0000000000000000
 kcm_push net/kcm/kcmsock.c:753 [inline]
 kcm_sendmsg+0x19cf/0x20f0 net/kcm/kcmsock.c:927
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg+0xc3/0x120 net/socket.c:661
 ___sys_sendmsg+0x3b3/0x8e0 net/socket.c:2225
 __sys_sendmmsg+0x195/0x470 net/socket.c:2320
 __do_sys_sendmmsg net/socket.c:2349 [inline]
 __se_sys_sendmmsg net/socket.c:2346 [inline]
 __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2346
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4665d9
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2b9f20e188 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9
RDX: 0000000000000002 RSI: 00000000200021c0 RDI: 0000000000000005
RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000400400d1 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffde39204cf R14: 00007f2b9f20e300 R15: 0000000000022000
Kernel Offset: disabled
Rebooting in 86400 seconds..