ERROR: (device loop3): dbAllocNext: Corrupt dmap page
ERROR: (device loop3): remounting filesystem as read-only
BUG at fs/jfs/jfs_dmap.c:3021 assert(nb <= DBWORD)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:3021!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 6684 Comm: syz.3.79 Tainted: G        W           syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:dbFindBits+0x177/0x1a0 fs/jfs/jfs_dmap.c:3021
Code: e9 20 ff ff ff e8 d9 0e 8a fe 48 c7 c7 40 75 43 8b 48 c7 c6 80 72 43 8b ba cd 0b 00 00 48 c7 c1 00 7d 43 8b e8 1a 03 f3 fd 90 <0f> 0b e8 b2 0e 8a fe 48 c7 c7 40 75 43 8b 48 c7 c6 80 72 43 8b ba
RSP: 0018:ffffc900045bfab8 EFLAGS: 00010246
RAX: 0000000000000032 RBX: 000000000000000a RCX: 702e7854d4566900
RDX: ffffc9000db31000 RSI: 000000000000079e RDI: 000000000000079f
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff520008b7efd R12: 000000000008fba0
R13: 000000000000000a R14: 0000000000000400 R15: ffff888028ced000
FS:  00007efc786866c0(0000) GS:ffff8881269c4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3928c5 CR3: 000000002f144000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 dbAllocDmapLev+0x16b/0x3c0 fs/jfs/jfs_dmap.c:1985
 dbAllocCtl+0x14a/0x9c0 fs/jfs/jfs_dmap.c:1825
 dbAllocAG+0x1e6/0xff0 fs/jfs/jfs_dmap.c:1353
 dbDiscardAG+0x2df/0x900 fs/jfs/jfs_dmap.c:1608
 jfs_ioc_trim+0x429/0x690 fs/jfs/jfs_discard.c:106
 jfs_ioctl+0x2b8/0x3d0 fs/jfs/ioctl.c:131
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:598 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:584
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efc7a41ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007efc78686038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007efc7a645fa0 RCX: 00007efc7a41ebe9
RDX: 0000200000000000 RSI: 00000000c0185879 RDI: 0000000000000007
RBP: 00007efc7a4a1e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efc7a646038 R14: 00007efc7a645fa0 R15: 00007fff9fef64e8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindBits+0x177/0x1a0 fs/jfs/jfs_dmap.c:3021
Code: e9 20 ff ff ff e8 d9 0e 8a fe 48 c7 c7 40 75 43 8b 48 c7 c6 80 72 43 8b ba cd 0b 00 00 48 c7 c1 00 7d 43 8b e8 1a 03 f3 fd 90 <0f> 0b e8 b2 0e 8a fe 48 c7 c7 40 75 43 8b 48 c7 c6 80 72 43 8b ba
RSP: 0018:ffffc900045bfab8 EFLAGS: 00010246
RAX: 0000000000000032 RBX: 000000000000000a RCX: 702e7854d4566900
RDX: ffffc9000db31000 RSI: 000000000000079e RDI: 000000000000079f
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff520008b7efd R12: 000000000008fba0
R13: 000000000000000a R14: 0000000000000400 R15: ffff888028ced000
FS:  00007efc786866c0(0000) GS:ffff8881269c4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3928c5 CR3: 000000002f144000 CR4: 00000000003526f0