loop0: detected capacity change from 0 to 32768
BUG at fs/jfs/jfs_dmap.c:3104 assert(bitno < 32)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:3104!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4905 Comm: syz.0.16 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : dbFindBits+0x1ac/0x1b0 fs/jfs/jfs_dmap.c:3104
lr : dbFindBits+0x1ac/0x1b0 fs/jfs/jfs_dmap.c:3104
sp : ffff80001f486fc0
x29: ffff80001f486fc0 x28: 00000000ffffffff x27: dfff800000000000
x26: ffff0000ec78f800 x25: ffff0000ec78f021 x24: 0000000000000000
x23: ffff8000148064d0 x22: 0000000000000020 x21: 0000000000000001
x20: 00000000ffffffff x19: 0000000000000000 x18: 0000000000000001
x17: 0000000000000000 x16: ffff80001125f22c x15: 00000000ffffffff
x14: 0000000000000001 x13: 1fffe000341f1cd7 x12: 0000000000ff0100
x11: 0000000000000000 x10: 0000000000000000 x9 : 8fe7af7a2bba4500
x8 : 8fe7af7a2bba4500 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff80001f4868d8 x4 : ffff80001437f3e0 x3 : ffff80000a75f20c
x2 : ffff0001a0f82d50 x1 : 0000000100000000 x0 : 0000000000000030
Call trace:
 dbFindBits+0x1ac/0x1b0 fs/jfs/jfs_dmap.c:3104
 dbAllocDmapLev+0x13c/0x36c fs/jfs/jfs_dmap.c:2053
 dbAllocCtl+0x130/0x900 fs/jfs/jfs_dmap.c:1893
 dbAllocAG+0x1c0/0xdc0 fs/jfs/jfs_dmap.c:1421
 dbAlloc+0x43c/0x978 fs/jfs/jfs_dmap.c:877
 dtSplitUp fs/jfs/jfs_dtree.c:982 [inline]
 dtInsert+0x860/0x5614 fs/jfs/jfs_dtree.c:871
 jfs_create+0x5e4/0x920 fs/jfs/namei.c:137
 lookup_open fs/namei.c:3470 [inline]
 open_last_lookups fs/namei.c:3540 [inline]
 path_openat+0xe18/0x2718 fs/namei.c:3747
 do_filp_open+0x184/0x368 fs/namei.c:3777
 do_sys_openat2+0x134/0x3f4 fs/open.c:1255
 do_sys_open fs/open.c:1271 [inline]
 __do_sys_openat fs/open.c:1287 [inline]
 __se_sys_openat fs/open.c:1282 [inline]
 __arm64_sys_openat+0x118/0x14c fs/open.c:1282
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1d0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Code: 9003fa63 912e8063 52818402 95e76593 (d4210000) 
---[ end trace 49b27b2af3641e05 ]---