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charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: general protection fault in dbFree Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f] CPU: 0 UID: 0 PID: 104 Comm: jfsCommit Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:dbFree+0xba/0x650 fs/jfs/jfs_dmap.c:352 Code: c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 de 34 e0 fe 48 8b 03 48 89 44 24 10 48 8b 44 24 20 48 8d 78 28 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 05 e8 ba 34 e0 fe 48 8b 44 24 20 48 8b 58 28 48 RSP: 0018:ffffc900018a7a98 EFLAGS: 00010206 RAX: 0000000000000005 RBX: ffff8880432eaea0 RCX: ffff88801c7ca4c0 RDX: 0000000000000000 RSI: 0000000000000022 RDI: 0000000000000028 RBP: 0000000000000001 R08: ffff88801c7ca4c0 R09: 0000000000000002 R10: 0000000000000040 R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000022 R14: ffff888055b49fd0 R15: 1ffff1100ab693fa FS: 0000000000000000(0000) GS:ffff88808d239000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f908a83f000 CR3: 0000000046fec000 CR4: 0000000000352ef0 Call Trace: txFreeMap+0x7ff/0xde0 fs/jfs/jfs_txnmgr.c:2539 txUpdateMap+0x308/0x9c0 fs/jfs/jfs_txnmgr.c:-1 txLazyCommit fs/jfs/jfs_txnmgr.c:2669 [inline] jfs_lazycommit+0x43f/0xa90 fs/jfs/jfs_txnmgr.c:2738 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:dbFree+0xba/0x650 fs/jfs/jfs_dmap.c:352 Code: c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 de 34 e0 fe 48 8b 03 48 89 44 24 10 48 8b 44 24 20 48 8d 78 28 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 05 e8 ba 34 e0 fe 48 8b 44 24 20 48 8b 58 28 48 RSP: 0018:ffffc900018a7a98 EFLAGS: 00010206 RAX: 0000000000000005 RBX: ffff8880432eaea0 RCX: ffff88801c7ca4c0 RDX: 0000000000000000 RSI: 0000000000000022 RDI: 0000000000000028 RBP: 0000000000000001 R08: ffff88801c7ca4c0 R09: 0000000000000002 R10: 0000000000000040 R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000022 R14: ffff888055b49fd0 R15: 1ffff1100ab693fa FS: 0000000000000000(0000) GS:ffff88808d239000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa71adff000 CR3: 0000000047507000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: c1 e8 03 shr $0x3,%eax 3: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) 8: 74 08 je 0x12 a: 48 89 df mov %rbx,%rdi d: e8 de 34 e0 fe call 0xfee034f0 12: 48 8b 03 mov (%rbx),%rax 15: 48 89 44 24 10 mov %rax,0x10(%rsp) 1a: 48 8b 44 24 20 mov 0x20(%rsp),%rax 1f: 48 8d 78 28 lea 0x28(%rax),%rdi 23: 48 89 f8 mov %rdi,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction 2f: 74 05 je 0x36 31: e8 ba 34 e0 fe call 0xfee034f0 36: 48 8b 44 24 20 mov 0x20(%rsp),%rax 3b: 48 8b 58 28 mov 0x28(%rax),%rbx 3f: 48 rex.W Tested on: commit: 37bb2e72 Merge tag 'staging-6.19-rc1' of git://git.ker.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=162efc1a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=1889d7812b50029c dashboard link: https://syzkaller.appspot.com/bug?extid=a099d674daa27a9272db compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 patch: https://syzkaller.appspot.com/x/patch.diff?x=1386221a580000