loop0: detected capacity change from 0 to 32768
BUG at fs/jfs/jfs_dmap.c:2933 assert(n < 4)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:2933!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 3608 Comm: syz-executor946 Not tainted 6.0.0-rc7-syzkaller-00220-gffb4d94b4314 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
RIP: 0010:dbFindLeaf+0x43c/0x440 fs/jfs/jfs_dmap.c:2933
Code: dc fe eb 87 e8 c5 02 8a fe 48 c7 c7 20 4a cd 8a 48 c7 c6 e0 57 cd 8a ba 75 0b 00 00 48 c7 c1 c0 54 cd 8a 31 c0 e8 a5 2a 23 07 <0f> 0b 66 90 55 41 57 41 56 41 55 41 54 53 48 83 ec 68 49 89 ff 49
RSP: 0018:ffffc900037bf2b8 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000019 RCX: 3dd9d3a727890d00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 00000000ffffffff R08: ffffffff816bd38d R09: ffffed10173467f1
R10: ffffed10173467f1 R11: 1ffff110173467f0 R12: ffff88807d757010
R13: 0000000000000000 R14: ffff88807d75703d R15: 000000000000001c
FS:  00005555569fc300(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002000c380 CR3: 00000000724c5000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 dbAllocDmapLev+0xa9/0x420 fs/jfs/jfs_dmap.c:1937
 dbAlloc+0xa7b/0xc90 fs/jfs/jfs_dmap.c:825
 extBalloc fs/jfs/jfs_extent.c:321 [inline]
 extAlloc+0x4b9/0xff0 fs/jfs/jfs_extent.c:122
 jfs_get_block+0x342/0xce0 fs/jfs/inode.c:248
 __block_write_begin_int+0x5f6/0x1ba0 fs/buffer.c:2006
 __block_write_begin fs/buffer.c:2056 [inline]
 block_write_begin+0x93/0x1e0 fs/buffer.c:2117
 jfs_write_begin+0x2d/0x60 fs/jfs/inode.c:304
 generic_perform_write+0x2a8/0x5b0 mm/filemap.c:3738
 __generic_file_write_iter+0x176/0x400 mm/filemap.c:3866
 generic_file_write_iter+0xab/0x310 mm/filemap.c:3898
 do_iter_write+0x6c2/0xc20 fs/read_write.c:861
 vfs_writev fs/read_write.c:934 [inline]
 do_writev+0x23e/0x430 fs/read_write.c:977
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f982b5cfe69
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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe90f7c188 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f982b5cfe69
RDX: 0000000000000001 RSI: 0000000020000000 RDI: 0000000000000003
RBP: 00007f982b58f630 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000f8008000
R13: 0000000000000000 R14: 00080000000000f8 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindLeaf+0x43c/0x440 fs/jfs/jfs_dmap.c:2933
Code: dc fe eb 87 e8 c5 02 8a fe 48 c7 c7 20 4a cd 8a 48 c7 c6 e0 57 cd 8a ba 75 0b 00 00 48 c7 c1 c0 54 cd 8a 31 c0 e8 a5 2a 23 07 <0f> 0b 66 90 55 41 57 41 56 41 55 41 54 53 48 83 ec 68 49 89 ff 49
RSP: 0018:ffffc900037bf2b8 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000019 RCX: 3dd9d3a727890d00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 00000000ffffffff R08: ffffffff816bd38d R09: ffffed10173467f1
R10: ffffed10173467f1 R11: 1ffff110173467f0 R12: ffff88807d757010
R13: 0000000000000000 R14: ffff88807d75703d R15: 000000000000001c
FS:  00005555569fc300(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055aa92b26a00 CR3: 00000000724c5000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400