BUG at fs/jfs/jfs_dmap.c:3021 assert(nb <= DBWORD)
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kernel BUG at fs/jfs/jfs_dmap.c:3021!
Internal error: Oops - BUG: 00000000f2000800 [#1]  SMP
Modules linked in:
CPU: 0 UID: 0 PID: 6710 Comm: syz.0.12 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 : dbFindBits+0x184/0x1b0 fs/jfs/jfs_dmap.c:3021
lr : dbFindBits+0x184/0x1b0 fs/jfs/jfs_dmap.c:3021
sp : ffff8000a56b7890
x29: ffff8000a56b7890 x28: 00000000ffffffff x27: dfff800000000000
x26: ffff0000daccf800 x25: ffff0000daccf021 x24: 000000000000000a
x23: 0000000000000000 x22: ffff0000d8be0000 x21: 0000000000000400
x20: 00000000ffffffff x19: 000000000000000a x18: 00000000ffffffff
x17: ffff800093325000 x16: ffff800082dee3c0 x15: 0000000000000001
x14: 1ffff00014ad6e8c x13: 0000000000000000 x12: 0000000000000000
x11: 0000000000080000 x10: 00000000000032d7 x9 : d3e5d7b622757b00
x8 : d3e5d7b622757b00 x7 : ffff800080565bcc x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000807d6fd0
x2 : 0000000000000001 x1 : 0000000100000000 x0 : 0000000000000032
Call trace:
 dbFindBits+0x184/0x1b0 fs/jfs/jfs_dmap.c:3021 (P)
 dbAllocDmapLev+0x13c/0x36c fs/jfs/jfs_dmap.c:1985
 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+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: f004b1a3 91010063 528179a2 9793906b (d4210000) 
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