loop0: detected capacity change from 0 to 32768
BUG at fs/jfs/jfs_dmap.c:2958 assert(n < 4)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:2958!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 5020 Comm: syz-executor235 Not tainted 6.5.0-rc1-syzkaller-00006-g3f01e9fed845 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023
RIP: 0010:dbFindLeaf+0x153/0x260 fs/jfs/jfs_dmap.c:2958
Code: fe 83 fb 04 75 8c e8 7c ed 96 fe 48 c7 c1 00 bc a9 8a ba 8e 0b 00 00 48 c7 c6 40 ba a9 8a 48 c7 c7 80 ba a9 8a e8 1d 95 7a fe <0f> 0b e8 56 ed 96 fe 44 8d 34 ad 01 00 00 00 31 ff 83 6c 24 04 01
RSP: 0018:ffffc90003b9f320 EFLAGS: 00010286
RAX: 000000000000002b RBX: 0000000000000004 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff81691b9c RDI: 0000000000000005
RBP: 0000000000000014 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000001 R12: ffff88807ad43010
R13: 0000000000000000 R14: 0000000000000011 R15: 00000000ffffffff
FS:  00005555569f3380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020ea0000 CR3: 000000007852b000 CR4: 0000000000350ee0
Call Trace:
 <TASK>
 dbAllocDmapLev+0xa2/0x2f0 fs/jfs/jfs_dmap.c:1959
 dbAllocCtl+0x131/0x7a0 fs/jfs/jfs_dmap.c:1815
 dbAllocAG+0x8da/0xdc0 fs/jfs/jfs_dmap.c:1356
 dbAlloc+0x411/0xab0 fs/jfs/jfs_dmap.c:880
 extBalloc fs/jfs/jfs_extent.c:321 [inline]
 extAlloc+0x4eb/0xeb0 fs/jfs/jfs_extent.c:122
 jfs_get_block+0x665/0xa90 fs/jfs/inode.c:248
 __block_write_begin_int+0x3b1/0x14a0 fs/buffer.c:2128
 __block_write_begin fs/buffer.c:2178 [inline]
 block_write_begin+0xb9/0x4d0 fs/buffer.c:2239
 jfs_write_begin+0x31/0xd0 fs/jfs/inode.c:299
 generic_perform_write+0x26b/0x5d0 mm/filemap.c:3923
 __generic_file_write_iter+0x1f8/0x240 mm/filemap.c:4018
 generic_file_write_iter+0xe3/0x350 mm/filemap.c:4044
 call_write_iter include/linux/fs.h:1871 [inline]
 do_iter_readv_writev+0x211/0x3b0 fs/read_write.c:735
 do_iter_write+0x182/0x810 fs/read_write.c:860
 vfs_writev+0x1b0/0x670 fs/read_write.c:933
 do_pwritev+0x1ad/0x260 fs/read_write.c:1030
 __do_sys_pwritev2 fs/read_write.c:1089 [inline]
 __se_sys_pwritev2 fs/read_write.c:1080 [inline]
 __x64_sys_pwritev2+0xef/0x150 fs/read_write.c:1080
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f79a5c67639
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd1b7f35d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 00007ffd1b7f37b8 RCX: 00007f79a5c67639
RDX: 0000000000000001 RSI: 0000000020000100 RDI: 0000000000000004
RBP: 00007f79a5ce0610 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000005405 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffd1b7f37a8 R14: 0000000000000001 R15: 0000000000000001
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindLeaf+0x153/0x260 fs/jfs/jfs_dmap.c:2958
Code: fe 83 fb 04 75 8c e8 7c ed 96 fe 48 c7 c1 00 bc a9 8a ba 8e 0b 00 00 48 c7 c6 40 ba a9 8a 48 c7 c7 80 ba a9 8a e8 1d 95 7a fe <0f> 0b e8 56 ed 96 fe 44 8d 34 ad 01 00 00 00 31 ff 83 6c 24 04 01
RSP: 0018:ffffc90003b9f320 EFLAGS: 00010286
RAX: 000000000000002b RBX: 0000000000000004 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff81691b9c RDI: 0000000000000005
RBP: 0000000000000014 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000001 R12: ffff88807ad43010
R13: 0000000000000000 R14: 0000000000000011 R15: 00000000ffffffff
FS:  00005555569f3380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020ea0000 CR3: 000000007852b000 CR4: 0000000000350ee0