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!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 4218 Comm: syz-executor324 Not tainted 6.1.43-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : dbFindLeaf+0x3e0/0x3e4 fs/jfs/jfs_dmap.c:2958
lr : dbFindLeaf+0x3e0/0x3e4 fs/jfs/jfs_dmap.c:2958
sp : ffff80001dca6e70
x29: ffff80001dca6e80 x28: 0000000000000012 x27: dfff800000000000
x26: 00000000ffffffff x25: 0000000000000014 x24: ffff800015e3a430
x23: 0000000000000011 x22: 0000000000000003 x21: 0000000000000000
x20: ffff0000c4dba010 x19: ffff80001dca6f00 x18: ffff80001dca63c0
x17: 0000000000000000 x16: ffff800012117bc4 x15: 0000000000000000
x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000001
x11: ff80800008345c20 x10: 0000000000000000 x9 : fe681c7f09d5ce00
x8 : fe681c7f09d5ce00 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff80001dca6778 x4 : ffff800015982b20 x3 : ffff80000aa7b8ac
x2 : ffff0001b4571cd0 x1 : 0000000100000000 x0 : 000000000000002b
Call trace:
 dbFindLeaf+0x3e0/0x3e4 fs/jfs/jfs_dmap.c:2958
 dbAllocDmapLev+0xc4/0x410 fs/jfs/jfs_dmap.c:1959
 dbAllocCtl+0x104/0x840 fs/jfs/jfs_dmap.c:1815
 dbAllocAG+0x208/0xe4c fs/jfs/jfs_dmap.c:1356
 dbAlloc+0x520/0xb68 fs/jfs/jfs_dmap.c:880
 extBalloc fs/jfs/jfs_extent.c:321 [inline]
 extAlloc+0x3f0/0xdd0 fs/jfs/jfs_extent.c:122
 jfs_get_block+0x340/0xb98 fs/jfs/inode.c:248
 __block_write_begin_int+0x340/0x13b4 fs/buffer.c:1991
 __block_write_begin fs/buffer.c:2041 [inline]
 block_write_begin+0x98/0x11c fs/buffer.c:2102
 jfs_write_begin+0x44/0x88 fs/jfs/inode.c:304
 generic_perform_write+0x278/0x55c mm/filemap.c:3754
 __generic_file_write_iter+0x168/0x388 mm/filemap.c:3882
 generic_file_write_iter+0xb8/0x2b4 mm/filemap.c:3914
 do_iter_write+0x534/0x964 fs/read_write.c:861
 vfs_writev fs/read_write.c:934 [inline]
 do_pwritev+0x1ec/0x334 fs/read_write.c:1031
 __do_sys_pwritev2 fs/read_write.c:1090 [inline]
 __se_sys_pwritev2 fs/read_write.c:1081 [inline]
 __arm64_sys_pwritev2+0xd4/0x108 fs/read_write.c:1081
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581
Code: b00461c3 91058063 528171c2 95964402 (d4210000) 
---[ end trace 0000000000000000 ]---