BUG at fs/jfs/jfs_dmap.c:3104 assert(bitno < 32)
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kernel BUG at fs/jfs/jfs_dmap.c:3104!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 13889 Comm: syz.6.1911 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:dbFindBits+0x193/0x1a0 fs/jfs/jfs_dmap.c:3104
Code: 63 bd e2 06 0f 0b e8 1c d0 a9 fe 48 c7 c7 00 2d 62 8a 48 c7 c6 80 2a 62 8a ba 20 0c 00 00 48 c7 c1 20 35 62 8a e8 3d bd e2 06 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 90 55 41 57 41 56 41 55 41 54
RSP: 0018:ffffc90003786cc8 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: f89694cc6119d400
RDX: ffffc90019007000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: 00000000ffffffff R08: ffff8880b9133d7f R09: 1ffff110172267af
R10: dffffc0000000000 R11: ffffed10172267b0 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  00007fbfd71b06c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000067cdd000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 dbAllocDmapLev+0x169/0x3c0 fs/jfs/jfs_dmap.c:2053
 dbAllocCtl+0x148/0x9b0 fs/jfs/jfs_dmap.c:1893
 dbAllocAG+0x1e7/0xfe0 fs/jfs/jfs_dmap.c:1421
 dbAlloc+0x5a6/0xba0 fs/jfs/jfs_dmap.c:877
 xtSplitUp+0x431/0x1c60 fs/jfs/jfs_xtree.c:756
 xtInsert+0x403/0xc50 fs/jfs/jfs_xtree.c:604
 extAlloc+0xa1f/0xf80 fs/jfs/jfs_extent.c:148
 jfs_get_block+0x355/0xad0 fs/jfs/inode.c:264
 get_more_blocks fs/direct-io.c:673 [inline]
 do_direct_IO fs/direct-io.c:959 [inline]
 do_blockdev_direct_IO fs/direct-io.c:1276 [inline]
 __blockdev_direct_IO+0x13d4/0x3a70 fs/direct-io.c:1368
 blockdev_direct_IO include/linux/fs.h:3345 [inline]
 jfs_direct_IO+0x119/0x220 fs/jfs/inode.c:349
 generic_file_direct_write+0x22c/0x490 mm/filemap.c:3687
 __generic_file_write_iter+0x2b1/0x4e0 mm/filemap.c:3869
 generic_file_write_iter+0xa6/0x1b0 mm/filemap.c:3944
 do_iter_readv_writev+0x47e/0x5f0 fs/read_write.c:-1
 do_iter_write+0x205/0x7b0 fs/read_write.c:855
 vfs_writev fs/read_write.c:928 [inline]
 do_pwritev+0x240/0x3a0 fs/read_write.c:1025
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fbfd8f98dd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbfd71b0028 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 00007fbfd9212180 RCX: 00007fbfd8f98dd9
RDX: 0000000000000001 RSI: 0000200000000240 RDI: 0000000000000006
RBP: 00007fbfd902ed69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000007800 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbfd9212218 R14: 00007fbfd9212180 R15: 00007ffcd4b4eb08
 </TASK>
Modules linked in:
---[ end trace 12ee8284cae19dd0 ]---
RIP: 0010:dbFindBits+0x193/0x1a0 fs/jfs/jfs_dmap.c:3104
Code: 63 bd e2 06 0f 0b e8 1c d0 a9 fe 48 c7 c7 00 2d 62 8a 48 c7 c6 80 2a 62 8a ba 20 0c 00 00 48 c7 c1 20 35 62 8a e8 3d bd e2 06 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 90 55 41 57 41 56 41 55 41 54
RSP: 0018:ffffc90003786cc8 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: f89694cc6119d400
RDX: ffffc90019007000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: 00000000ffffffff R08: ffff8880b9133d7f R09: 1ffff110172267af
R10: dffffc0000000000 R11: ffffed10172267b0 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  00007fbfd71b06c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe7634692f8 CR3: 0000000067cdd000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400