EXT4-fs error (device loop4): ext4_mb_generate_buddy:744: group 0, block bitmap and bg descriptor inconsistent: 58 vs 48 free clusters
divide error: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 28566 Comm: syz-executor.3 Not tainted 4.19.204-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:netem_enqueue+0x1217/0x3170 net/sched/sch_netem.c:516
Code: f6 74 1f 4c 89 44 24 20 89 4c 24 18 89 44 24 10 e8 ee ce 02 fb 4c 8b 44 24 20 8b 4c 24 18 8b 44 24 10 2b 8d 84 00 00 00 31 d2 <f7> f1 48 b8 00 00 00 00 00 fc ff df 49 01 d6 4c 89 f1 48 c1 e9 03
netlink: 36 bytes leftover after parsing attributes in process `syz-executor.2'.
RSP: 0018:ffff8880338074a0 EFLAGS: 00010246
RAX: 0000000063f3259a RBX: 0000000000000008 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88809436e1c4
RBP: ffff88809436e140 R08: ffff88809436e218 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000000 R14: ffff8880a66d0830 R15: ffff88809a9a1240
FS:  00007f83932f0700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e321000 CR3: 000000003d26e000 CR4: 00000000001426f0
netlink: 8 bytes leftover after parsing attributes in process `syz-executor.2'.
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 netem_enqueue+0x1d6b/0x3170 net/sched/sch_netem.c:480
 __dev_xmit_skb net/core/dev.c:3494 [inline]
 __dev_queue_xmit+0x140a/0x2e00 net/core/dev.c:3807
 packet_snd net/packet/af_packet.c:2988 [inline]
 packet_sendmsg+0x25ae/0x7720 net/packet/af_packet.c:3013
 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: 0033:0x4665e9
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:00007f83932f0188 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9
RDX: 000000000400004e RSI: 0000000020000d00 RDI: 0000000000000004
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffe7add68ef R14: 00007f83932f0300 R15: 0000000000022000
Modules linked in:
---[ end trace d0b918211cc0e279 ]---
RIP: 0010:netem_enqueue+0x1217/0x3170 net/sched/sch_netem.c:516
Code: f6 74 1f 4c 89 44 24 20 89 4c 24 18 89 44 24 10 e8 ee ce 02 fb 4c 8b 44 24 20 8b 4c 24 18 8b 44 24 10 2b 8d 84 00 00 00 31 d2 <f7> f1 48 b8 00 00 00 00 00 fc ff df 49 01 d6 4c 89 f1 48 c1 e9 03
RSP: 0018:ffff8880338074a0 EFLAGS: 00010246
RAX: 0000000063f3259a RBX: 0000000000000008 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88809436e1c4
RBP: ffff88809436e140 R08: ffff88809436e218 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000000 R14: ffff8880a66d0830 R15: ffff88809a9a1240
FS:  00007f83932f0700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e321000 CR3: 000000003d26e000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	f6 74 1f 4c          	divb   0x4c(%rdi,%rbx,1)
   4:	89 44 24 20          	mov    %eax,0x20(%rsp)
   8:	89 4c 24 18          	mov    %ecx,0x18(%rsp)
   c:	89 44 24 10          	mov    %eax,0x10(%rsp)
  10:	e8 ee ce 02 fb       	callq  0xfb02cf03
  15:	4c 8b 44 24 20       	mov    0x20(%rsp),%r8
  1a:	8b 4c 24 18          	mov    0x18(%rsp),%ecx
  1e:	8b 44 24 10          	mov    0x10(%rsp),%eax
  22:	2b 8d 84 00 00 00    	sub    0x84(%rbp),%ecx
  28:	31 d2                	xor    %edx,%edx
* 2a:	f7 f1                	div    %ecx <-- trapping instruction
  2c:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  33:	fc ff df
  36:	49 01 d6             	add    %rdx,%r14
  39:	4c 89 f1             	mov    %r14,%rcx
  3c:	48 c1 e9 03          	shr    $0x3,%rcx