loop0: detected capacity change from 0 to 32768
BUG at fs/jfs/jfs_dmap.c:3052 assert(n < 4)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:3052!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4417 Comm: syz-executor.0 Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : dbFindLeaf+0x4a4/0x4a8 fs/jfs/jfs_dmap.c:3052
lr : dbFindLeaf+0x4a4/0x4a8 fs/jfs/jfs_dmap.c:3052
sp : ffff80001fd66e90
x29: ffff80001fd66ea0 x28: 00000000ffffffff x27: 0000000000000014
x26: dfff800000000000 x25: 0000000000000003 x24: 0000000000000011
x23: 0000000000000155 x22: 0000000000000000 x21: ffff0000ca450010
x20: 0000000000000100 x19: 0000000000000012 x18: ffff80001fd664c0
x17: 1fffe0003682eb8e x16: ffff800011b4e3fc x15: 0000000000017f3e
x14: 1ffff0000296e06c x13: dfff800000000000 x12: 0000000000000001
x11: 0000000000000000 x10: 0000000000000000 x9 : b3e71fcc52f71f00
x8 : b3e71fcc52f71f00 x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000000 x3 : ffff80000aa0f0fc
x2 : ffff0001b4175d10 x1 : 0000000100000000 x0 : 000000000000002b
Call trace:
 dbFindLeaf+0x4a4/0x4a8 fs/jfs/jfs_dmap.c:3052
 dbAllocDmapLev+0xc8/0x414 fs/jfs/jfs_dmap.c:2038
 dbAllocCtl+0x12c/0x8c4 fs/jfs/jfs_dmap.c:1894
 dbAllocAG+0x208/0xe4c fs/jfs/jfs_dmap.c:1432
 dbAlloc+0x4b0/0xa18 fs/jfs/jfs_dmap.c:888
 extBalloc fs/jfs/jfs_extent.c:523 [inline]
 extAlloc+0x3fc/0xe68 fs/jfs/jfs_extent.c:125
 jfs_get_block+0x34c/0xbfc fs/jfs/inode.c:258
 nobh_write_begin+0x2d8/0xa28 fs/buffer.c:2650
 jfs_write_begin+0x58/0xa0 fs/jfs/inode.c:322
 generic_perform_write+0x24c/0x520 mm/filemap.c:3785
 __generic_file_write_iter+0x230/0x454 mm/filemap.c:3912
 generic_file_write_iter+0xb4/0x1b8 mm/filemap.c:3944
 do_iter_readv_writev+0x420/0x5f8
 do_iter_write+0x1b8/0x66c fs/read_write.c:855
 vfs_writev fs/read_write.c:928 [inline]
 do_pwritev+0x1ec/0x334 fs/read_write.c:1025
 __do_sys_pwritev2 fs/read_write.c:1084 [inline]
 __se_sys_pwritev2 fs/read_write.c:1075 [inline]
 __arm64_sys_pwritev2+0xd4/0x108 fs/read_write.c:1075
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Code: d0043523 91000063 52817d82 95970be1 (d4210000) 
---[ end trace 32f8803abfd666e0 ]---