kernel BUG in txEnd
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sanan....@gmail.com
Jun 26, 2026, 5:27:56 PM (3 days ago) Jun 26
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Good day, dear maintainers,
We found a bug using a modified version of syzkaller.
Kernel Branch: 7.0-rc1
Kernel Config: <https://drive.google.com/open?id=1XWXrj7ZUAS3GWmqvnny_U_mcxR6_AZCL>
Unfortunately, we don't have any reproducer for this bug yet.
Thank you!
Best regards,
Sanan Hasanov
ERROR: (device loop2): xtTruncate: xt_getpage: xtree page corrupt
BUG at fs/jfs/jfs_txnmgr.c:529 assert(tblk->next == 0)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_txnmgr.c:529!
Oops: invalid opcode: 0000 [#1] SMP KASAN
CPU: 0 UID: 0 PID: 18499 Comm: syz.2.778 Not tainted 7.0.0-rc1 #1 PREEMPT(full)
Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:txEnd+0x51f/0x530 fs/jfs/jfs_txnmgr.c:529
Code: e9 cc fe ff ff e8 91 9f 81 fe 48 c7 c7 60 5a 6a 8b 48 c7 c6 59 56 6a 8b ba 11 02 00 00 48 c7 c1 a0 5a 6a 8b e8 b2 b4 eb fd 90 <0f> 0b 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 55
RSP: 0018:ffffc9000c8c73a0 EFLAGS: 00010246
RAX: 0000000000000036 RBX: ffff888061f31800 RCX: b46f4a2b10298c00
RDX: ffffc9001059b000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9000175fd72 R08: ffff88802bc24813 R09: 1ffff11005784902
R10: dffffc0000000000 R11: ffffed1005784903 R12: 1ffff920002ebfb3
R13: dffffc0000000000 R14: ffffc9000175fd98 R15: 00000000000000c8
FS: 00007faaee6ad6c0(0000) GS:ffff88809b068000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f954d146260 CR3: 00000000515a0000 CR4: 00000000000006f0
Call Trace:
<TASK>
jfs_truncate_nolock+0x2b6/0x340 fs/jfs/inode.c:399
jfs_truncate+0xce/0x140 fs/jfs/inode.c:420
jfs_direct_IO+0x1ef/0x220 fs/jfs/inode.c:350
generic_file_direct_write+0x1d5/0x3e0 mm/filemap.c:4248
__generic_file_write_iter+0xdb/0x180 mm/filemap.c:4417
generic_file_write_iter+0x117/0x540 mm/filemap.c:4457
iter_file_splice_write+0x9e0/0x1180 fs/splice.c:736
do_splice_from fs/splice.c:936 [inline]
direct_splice_actor+0xfb/0x150 fs/splice.c:1159
splice_direct_to_actor+0x4df/0xb90 fs/splice.c:1103
do_splice_direct_actor fs/splice.c:1202 [inline]
do_splice_direct+0x181/0x270 fs/splice.c:1228
do_sendfile+0x4bb/0x7b0 fs/read_write.c:1372
__do_sys_sendfile64 fs/read_write.c:1433 [inline]
__se_sys_sendfile64 fs/read_write.c:1419 [inline]
__x64_sys_sendfile64+0x1ab/0x200 fs/read_write.c:1419
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x160/0xfc0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x4b/0x53
RIP: 0033:0x7faaed7a3b6d
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007faaee6ad018 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007faaeda16090 RCX: 00007faaed7a3b6d
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004
RBP: 00007faaed847c3e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020fffe85 R11: 0000000000000246 R12: 0000000000000000
R13: 00007faaeda16128 R14: 00007faaeda16090 R15: 00007ffcc7e0ce60
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:txEnd+0x51f/0x530 fs/jfs/jfs_txnmgr.c:529
Code: e9 cc fe ff ff e8 91 9f 81 fe 48 c7 c7 60 5a 6a 8b 48 c7 c6 59 56 6a 8b ba 11 02 00 00 48 c7 c1 a0 5a 6a 8b e8 b2 b4 eb fd 90 <0f> 0b 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 55
RSP: 0018:ffffc9000c8c73a0 EFLAGS: 00010246
RAX: 0000000000000036 RBX: ffff888061f31800 RCX: b46f4a2b10298c00
RDX: ffffc9001059b000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9000175fd72 R08: ffff88802bc24813 R09: 1ffff11005784902
R10: dffffc0000000000 R11: ffffed1005784903 R12: 1ffff920002ebfb3
R13: dffffc0000000000 R14: ffffc9000175fd98 R15: 00000000000000c8
FS: 00007faaee6ad6c0(0000) GS:ffff88809b068000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f954d146260 CR3: 00000000515a0000 CR4: 00000000000006f0
<<<<<<<<<<<<<<< tail report >>>>>>>>>>>>>>>
Oops: invalid opcode: 0000 [#1] SMP KASAN
CPU: 0 UID: 0 PID: 18499 Comm: syz.2.778 Not tainted 7.0.0-rc1 #1 PREEMPT(full)
Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:txEnd+0x51f/0x530
Code: e9 cc fe ff ff e8 91 9f 81 fe 48 c7 c7 60 5a 6a 8b 48 c7 c6 59 56 6a 8b ba 11 02 00 00 48 c7 c1 a0 5a 6a 8b e8 b2 b4 eb fd 90 <0f> 0b 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 55
RSP: 0018:ffffc9000c8c73a0 EFLAGS: 00010246
RAX: 0000000000000036 RBX: ffff888061f31800 RCX: b46f4a2b10298c00
RDX: ffffc9001059b000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9000175fd72 R08: ffff88802bc24813 R09: 1ffff11005784902
R10: dffffc0000000000 R11: ffffed1005784903 R12: 1ffff920002ebfb3
R13: dffffc0000000000 R14: ffffc9000175fd98 R15: 00000000000000c8
FS: 00007faaee6ad6c0(0000) GS:ffff88809b068000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f954d146260 CR3: 00000000515a0000 CR4: 00000000000006f0
Call Trace:
<TASK>
jfs_truncate_nolock+0x2b6/0x340
jfs_truncate+0xce/0x140
jfs_direct_IO+0x1ef/0x220
generic_file_direct_write+0x1d5/0x3e0
__generic_file_write_iter+0xdb/0x180
generic_file_write_iter+0x117/0x540
iter_file_splice_write+0x9e0/0x1180
direct_splice_actor+0xfb/0x150
splice_direct_to_actor+0x4df/0xb90
do_splice_direct+0x181/0x270
do_sendfile+0x4bb/0x7b0
__x64_sys_sendfile64+0x1ab/0x200
do_syscall_64+0x160/0xfc0
entry_SYSCALL_64_after_hwframe+0x4b/0x53
RIP: 0033:0x7faaed7a3b6d
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007faaee6ad018 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007faaeda16090 RCX: 00007faaed7a3b6d
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004
RBP: 00007faaed847c3e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020fffe85 R11: 0000000000000246 R12: 0000000000000000
R13: 00007faaeda16128 R14: 00007faaeda16090 R15: 00007ffcc7e0ce60
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:txEnd+0x51f/0x530
Code: e9 cc fe ff ff e8 91 9f 81 fe 48 c7 c7 60 5a 6a 8b 48 c7 c6 59 56 6a 8b ba 11 02 00 00 48 c7 c1 a0 5a 6a 8b e8 b2 b4 eb fd 90 <0f> 0b 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 55
RSP: 0018:ffffc9000c8c73a0 EFLAGS: 00010246
RAX: 0000000000000036 RBX: ffff888061f31800 RCX: b46f4a2b10298c00
RDX: ffffc9001059b000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9000175fd72 R08: ffff88802bc24813 R09: 1ffff11005784902
R10: dffffc0000000000 R11: ffffed1005784903 R12: 1ffff920002ebfb3
R13: dffffc0000000000 R14: ffffc9000175fd98 R15: 00000000000000c8
FS: 00007faaee6ad6c0(0000) GS:ffff88809b068000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f954d146260 CR3: 00000000515a0000 CR4: 00000000000006f0
<<<<<<<<<<<<<<< tail report >>>>>>>>>>>>>>>
We found a bug using a modified version of syzkaller.
Kernel Branch: 7.0-rc1
Kernel Config: <https://drive.google.com/open?id=1XWXrj7ZUAS3GWmqvnny_U_mcxR6_AZCL>
Unfortunately, we don't have any reproducer for this bug yet.
Thank you!
Best regards,
Sanan Hasanov
ERROR: (device loop2): xtTruncate: xt_getpage: xtree page corrupt
BUG at fs/jfs/jfs_txnmgr.c:529 assert(tblk->next == 0)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_txnmgr.c:529!
Oops: invalid opcode: 0000 [#1] SMP KASAN
CPU: 0 UID: 0 PID: 18499 Comm: syz.2.778 Not tainted 7.0.0-rc1 #1 PREEMPT(full)
Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:txEnd+0x51f/0x530 fs/jfs/jfs_txnmgr.c:529
Code: e9 cc fe ff ff e8 91 9f 81 fe 48 c7 c7 60 5a 6a 8b 48 c7 c6 59 56 6a 8b ba 11 02 00 00 48 c7 c1 a0 5a 6a 8b e8 b2 b4 eb fd 90 <0f> 0b 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 55
RSP: 0018:ffffc9000c8c73a0 EFLAGS: 00010246
RAX: 0000000000000036 RBX: ffff888061f31800 RCX: b46f4a2b10298c00
RDX: ffffc9001059b000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9000175fd72 R08: ffff88802bc24813 R09: 1ffff11005784902
R10: dffffc0000000000 R11: ffffed1005784903 R12: 1ffff920002ebfb3
R13: dffffc0000000000 R14: ffffc9000175fd98 R15: 00000000000000c8
FS: 00007faaee6ad6c0(0000) GS:ffff88809b068000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f954d146260 CR3: 00000000515a0000 CR4: 00000000000006f0
Call Trace:
<TASK>
jfs_truncate_nolock+0x2b6/0x340 fs/jfs/inode.c:399
jfs_truncate+0xce/0x140 fs/jfs/inode.c:420
jfs_direct_IO+0x1ef/0x220 fs/jfs/inode.c:350
generic_file_direct_write+0x1d5/0x3e0 mm/filemap.c:4248
__generic_file_write_iter+0xdb/0x180 mm/filemap.c:4417
generic_file_write_iter+0x117/0x540 mm/filemap.c:4457
iter_file_splice_write+0x9e0/0x1180 fs/splice.c:736
do_splice_from fs/splice.c:936 [inline]
direct_splice_actor+0xfb/0x150 fs/splice.c:1159
splice_direct_to_actor+0x4df/0xb90 fs/splice.c:1103
do_splice_direct_actor fs/splice.c:1202 [inline]
do_splice_direct+0x181/0x270 fs/splice.c:1228
do_sendfile+0x4bb/0x7b0 fs/read_write.c:1372
__do_sys_sendfile64 fs/read_write.c:1433 [inline]
__se_sys_sendfile64 fs/read_write.c:1419 [inline]
__x64_sys_sendfile64+0x1ab/0x200 fs/read_write.c:1419
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x160/0xfc0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x4b/0x53
RIP: 0033:0x7faaed7a3b6d
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007faaee6ad018 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007faaeda16090 RCX: 00007faaed7a3b6d
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004
RBP: 00007faaed847c3e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020fffe85 R11: 0000000000000246 R12: 0000000000000000
R13: 00007faaeda16128 R14: 00007faaeda16090 R15: 00007ffcc7e0ce60
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:txEnd+0x51f/0x530 fs/jfs/jfs_txnmgr.c:529
Code: e9 cc fe ff ff e8 91 9f 81 fe 48 c7 c7 60 5a 6a 8b 48 c7 c6 59 56 6a 8b ba 11 02 00 00 48 c7 c1 a0 5a 6a 8b e8 b2 b4 eb fd 90 <0f> 0b 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 55
RSP: 0018:ffffc9000c8c73a0 EFLAGS: 00010246
RAX: 0000000000000036 RBX: ffff888061f31800 RCX: b46f4a2b10298c00
RDX: ffffc9001059b000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9000175fd72 R08: ffff88802bc24813 R09: 1ffff11005784902
R10: dffffc0000000000 R11: ffffed1005784903 R12: 1ffff920002ebfb3
R13: dffffc0000000000 R14: ffffc9000175fd98 R15: 00000000000000c8
FS: 00007faaee6ad6c0(0000) GS:ffff88809b068000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f954d146260 CR3: 00000000515a0000 CR4: 00000000000006f0
<<<<<<<<<<<<<<< tail report >>>>>>>>>>>>>>>
Oops: invalid opcode: 0000 [#1] SMP KASAN
CPU: 0 UID: 0 PID: 18499 Comm: syz.2.778 Not tainted 7.0.0-rc1 #1 PREEMPT(full)
Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:txEnd+0x51f/0x530
Code: e9 cc fe ff ff e8 91 9f 81 fe 48 c7 c7 60 5a 6a 8b 48 c7 c6 59 56 6a 8b ba 11 02 00 00 48 c7 c1 a0 5a 6a 8b e8 b2 b4 eb fd 90 <0f> 0b 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 55
RSP: 0018:ffffc9000c8c73a0 EFLAGS: 00010246
RAX: 0000000000000036 RBX: ffff888061f31800 RCX: b46f4a2b10298c00
RDX: ffffc9001059b000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9000175fd72 R08: ffff88802bc24813 R09: 1ffff11005784902
R10: dffffc0000000000 R11: ffffed1005784903 R12: 1ffff920002ebfb3
R13: dffffc0000000000 R14: ffffc9000175fd98 R15: 00000000000000c8
FS: 00007faaee6ad6c0(0000) GS:ffff88809b068000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f954d146260 CR3: 00000000515a0000 CR4: 00000000000006f0
Call Trace:
<TASK>
jfs_truncate_nolock+0x2b6/0x340
jfs_truncate+0xce/0x140
jfs_direct_IO+0x1ef/0x220
generic_file_direct_write+0x1d5/0x3e0
__generic_file_write_iter+0xdb/0x180
generic_file_write_iter+0x117/0x540
iter_file_splice_write+0x9e0/0x1180
direct_splice_actor+0xfb/0x150
splice_direct_to_actor+0x4df/0xb90
do_splice_direct+0x181/0x270
do_sendfile+0x4bb/0x7b0
__x64_sys_sendfile64+0x1ab/0x200
do_syscall_64+0x160/0xfc0
entry_SYSCALL_64_after_hwframe+0x4b/0x53
RIP: 0033:0x7faaed7a3b6d
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007faaee6ad018 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007faaeda16090 RCX: 00007faaed7a3b6d
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004
RBP: 00007faaed847c3e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020fffe85 R11: 0000000000000246 R12: 0000000000000000
R13: 00007faaeda16128 R14: 00007faaeda16090 R15: 00007ffcc7e0ce60
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:txEnd+0x51f/0x530
Code: e9 cc fe ff ff e8 91 9f 81 fe 48 c7 c7 60 5a 6a 8b 48 c7 c6 59 56 6a 8b ba 11 02 00 00 48 c7 c1 a0 5a 6a 8b e8 b2 b4 eb fd 90 <0f> 0b 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 55
RSP: 0018:ffffc9000c8c73a0 EFLAGS: 00010246
RAX: 0000000000000036 RBX: ffff888061f31800 RCX: b46f4a2b10298c00
RDX: ffffc9001059b000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9000175fd72 R08: ffff88802bc24813 R09: 1ffff11005784902
R10: dffffc0000000000 R11: ffffed1005784903 R12: 1ffff920002ebfb3
R13: dffffc0000000000 R14: ffffc9000175fd98 R15: 00000000000000c8
FS: 00007faaee6ad6c0(0000) GS:ffff88809b068000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f954d146260 CR3: 00000000515a0000 CR4: 00000000000006f0
<<<<<<<<<<<<<<< tail report >>>>>>>>>>>>>>>
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