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: 7470 Comm: syz.4.158 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 : ffff8000a1de7860
x29: ffff8000a1de7870 x28: 0000000000000060 x27: 00000000ffffffff
x26: 0000000000000001 x25: 000000000000005d x24: 0000000000000155
x23: ffff0000eb6c5021 x22: 0000000000000008 x21: ffff0000eb6c5010
x20: 000000000000005d x19: dfff800000000000 x18: 1fffe000337db690
x17: ffff80008f57e000 x16: ffff800082deb6c0 x15: 0000000000000001
x14: 1ffff000143bce88 x13: 0000000000000000 x12: 0000000000000000
x11: 0000000000080000 x10: 0000000000003e98 x9 : 005581924bd00c00
x8 : 005581924bd00c00 x7 : ffff800080564a40 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000807d6130
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
 dbAllocCtl+0x130/0x8e0 fs/jfs/jfs_dmap.c:1825
 dbAllocAG+0x1c0/0xdc0 fs/jfs/jfs_dmap.c:1353
 dbDiscardAG+0x1e0/0x66c fs/jfs/jfs_dmap.c:1608
 jfs_ioc_trim+0x3e8/0x5e0 fs/jfs/jfs_discard.c:106
 jfs_ioctl+0x2e4/0x478 fs/jfs/ioctl.c:131
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __arm64_sys_ioctl+0x14c/0x1c4 fs/ioctl.c:583
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c 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:746
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
Code: f004b1a3 91320063 528174e2 97939774 (d4210000) 
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