loop0: detected capacity change from 0 to 32768
BUG at fs/jfs/jfs_dmap.c:3045 assert(n < 4)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:3045!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 3966 Comm: syz-executor.0 Not tainted 5.15.167-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:dbFindLeaf+0x4de/0x4e0 fs/jfs/jfs_dmap.c:3045
Code: fe e9 55 ff ff ff e8 f1 cc 9d fe 48 c7 c7 a0 39 c1 8a 48 c7 c6 e0 36 c1 8a ba e5 0b 00 00 48 c7 c1 60 44 c1 8a e8 32 95 50 07 <0f> 0b 55 41 57 41 56 41 55 41 54 53 48 83 ec 68 48 89 fb 49 be 00
RSP: 0018:ffffc900010ff1d8 EFLAGS: 00010246
RAX: 000000000000002b RBX: 00000000ffffffff RCX: 7974049816bd4c00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000011 R08: ffffffff81668a3c R09: ffffed10172267a8
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000155
R13: 0000000000000003 R14: 0000000000000014 R15: 0000000000000000
FS:  00007f0ed69716c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0872fcd19c CR3: 0000000021d78000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 dbAllocDmapLev+0xcf/0x490 fs/jfs/jfs_dmap.c:2035
 dbAllocCtl+0x113/0x920 fs/jfs/jfs_dmap.c:1891
 dbAllocAG+0x28b/0x10b0 fs/jfs/jfs_dmap.c:1432
 dbAlloc+0x654/0xc90 fs/jfs/jfs_dmap.c:888
 extBalloc fs/jfs/jfs_extent.c:523 [inline]
 extAlloc+0x4f4/0x1000 fs/jfs/jfs_extent.c:125
 jfs_get_block+0x417/0xe50 fs/jfs/inode.c:258
 nobh_write_begin+0x398/0xda0 fs/buffer.c:2650
 jfs_write_begin+0x3e/0x80 fs/jfs/inode.c:322
 generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3785
 __generic_file_write_iter+0x243/0x4f0 mm/filemap.c:3912
 generic_file_write_iter+0xa7/0x1b0 mm/filemap.c:3944
 do_iter_readv_writev+0x594/0x7a0
 do_iter_write+0x1e6/0x760 fs/read_write.c:855
 vfs_writev fs/read_write.c:928 [inline]
 do_pwritev+0x219/0x360 fs/read_write.c:1025
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f0ed75efce9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0ed69710c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 00007f0ed770ef80 RCX: 00007f0ed75efce9
RDX: 0000000000000001 RSI: 0000000020000100 RDI: 0000000000000004
RBP: 00007f0ed763c47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000005405 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f0ed770ef80 R15: 00007ffcf8ee3588
 </TASK>
Modules linked in:
---[ end trace 06f87728ec09b0f3 ]---
RIP: 0010:dbFindLeaf+0x4de/0x4e0 fs/jfs/jfs_dmap.c:3045
Code: fe e9 55 ff ff ff e8 f1 cc 9d fe 48 c7 c7 a0 39 c1 8a 48 c7 c6 e0 36 c1 8a ba e5 0b 00 00 48 c7 c1 60 44 c1 8a e8 32 95 50 07 <0f> 0b 55 41 57 41 56 41 55 41 54 53 48 83 ec 68 48 89 fb 49 be 00
RSP: 0018:ffffc900010ff1d8 EFLAGS: 00010246
RAX: 000000000000002b RBX: 00000000ffffffff RCX: 7974049816bd4c00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000011 R08: ffffffff81668a3c R09: ffffed10172267a8
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000155
R13: 0000000000000003 R14: 0000000000000014 R15: 0000000000000000
FS:  00007f0ed69716c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0872fcd19c CR3: 0000000021d78000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400