BUG at fs/jfs/jfs_dmap.c:2983 assert(n < 4)
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kernel BUG at fs/jfs/jfs_dmap.c:2983!
Internal error: Oops - BUG: 00000000f2000800 [#1]  SMP
Modules linked in:
CPU: 0 UID: 0 PID: 8870 Comm: syz.6.341 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : dbFindLeaf+0x484/0x488 fs/jfs/jfs_dmap.c:2983
lr : dbFindLeaf+0x484/0x488 fs/jfs/jfs_dmap.c:2983
sp : ffff80009e386ad0
x29: ffff80009e386ae0 x28: 0000000000000010 x27: 00000000ffffffff
x26: 0000000000000003 x25: 000000000000000d x24: 0000000000000155
x23: ffff0000d3774021 x22: 0000000000000000 x21: ffff0000d3774010
x20: 000000000000000d x19: dfff800000000000 x18: 1fffe000337d4a90
x17: ffff80008f5ae000 x16: ffff800082defcc0 x15: 0000000000000001
x14: 1ffff00013c70cd4 x13: 0000000000000000 x12: 0000000000000000
x11: 0000000000080000 x10: 000000000007ffff x9 : 15f6941040577800
x8 : 15f6941040577800 x7 : ffff800080565b88 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000807d6f80
x2 : 0000000000000001 x1 : 0000000100000000 x0 : 000000000000002b
Call trace:
 dbFindLeaf+0x484/0x488 fs/jfs/jfs_dmap.c:2983 (P)
 dbAllocDmapLev+0x74/0x36c fs/jfs/jfs_dmap.c:1969
 dbAlloc+0x78c/0x9dc fs/jfs/jfs_dmap.c:844
 extBalloc fs/jfs/jfs_extent.c:336 [inline]
 extAlloc+0x42c/0xdc8 fs/jfs/jfs_extent.c:127
 jfs_get_block+0x2bc/0x8b8 fs/jfs/inode.c:254
 get_more_blocks fs/direct-io.c:648 [inline]
 do_direct_IO fs/direct-io.c:936 [inline]
 __blockdev_direct_IO+0x10bc/0x2818 fs/direct-io.c:1243
 blockdev_direct_IO include/linux/fs.h:3511 [inline]
 jfs_direct_IO+0xf0/0x1d0 fs/jfs/inode.c:339
 generic_file_direct_write+0x1a8/0x350 mm/filemap.c:4188
 __generic_file_write_iter+0x10c/0x204 mm/filemap.c:4357
 generic_file_write_iter+0x10c/0x47c mm/filemap.c:4397
 iter_file_splice_write+0x770/0xd7c fs/splice.c:738
 do_splice_from fs/splice.c:938 [inline]
 direct_splice_actor+0xec/0x14c fs/splice.c:1161
 splice_direct_to_actor+0x414/0x994 fs/splice.c:1105
 do_splice_direct_actor fs/splice.c:1204 [inline]
 do_splice_direct+0x130/0x210 fs/splice.c:1230
 do_sendfile+0x3cc/0x658 fs/read_write.c:1370
 __do_sys_sendfile64 fs/read_write.c:1431 [inline]
 __se_sys_sendfile64 fs/read_write.c:1417 [inline]
 __arm64_sys_sendfile64+0x1b4/0x274 fs/read_write.c:1417
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:724
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
Code: 9004b223 91140063 528174e2 9793865b (d4210000) 
---[ end trace 0000000000000000 ]---