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Message-ID: <6960a375.050a0220.1c677c.03b6.GAE@google.com> Date: Thu, 08 Jan 2026 22:43:01 -0800 From: syzbot <syzbot+b4a2af3000eaa84d95d5@...kaller.appspotmail.com> To: kartikey406@...il.com, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] [btrfs?] general protection fault in create_empty_buffers (5) Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: general protection fault in create_empty_buffers Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 2 UID: 0 PID: 6551 Comm: syz.0.69 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:create_empty_buffers+0x4d/0x480 fs/buffer.c:1694 Code: ea 6d ff 48 89 de ba 40 8c 40 00 4c 89 ef e8 0a f6 ff ff 49 89 c6 48 89 c3 eb 03 48 89 c3 e8 1a ea 6d ff 48 89 d8 48 c1 e8 03 <80> 3c 28 00 0f 85 81 03 00 00 48 8d 7b 08 4c 09 23 48 89 f8 48 c1 RSP: 0018:ffffc900041ff870 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8250f9bc RDX: ffff8880375dc980 RSI: ffffffff8250fe96 RDI: ffff8880375de000 RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: ffffea0000d84a80 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007f3509bdd6c0(0000) GS:ffff8880d6af5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3509bdcf98 CR3: 000000002babe000 CR4: 0000000000352ef0 Call Trace: <TASK> folio_create_buffers+0x109/0x150 fs/buffer.c:1802 block_read_full_folio+0x14c/0x850 fs/buffer.c:2403 filemap_read_folio+0xc8/0x2a0 mm/filemap.c:2496 do_read_cache_folio+0x266/0x5c0 mm/filemap.c:4096 do_read_cache_page mm/filemap.c:4162 [inline] read_cache_page_gfp+0x29/0x120 mm/filemap.c:4195 btrfs_read_disk_super+0x23a/0x5c0 fs/btrfs/volumes.c:1370 btrfs_scan_one_device+0x109/0x820 fs/btrfs/volumes.c:1478 btrfs_get_tree_super fs/btrfs/super.c:1860 [inline] btrfs_get_tree_subvol fs/btrfs/super.c:2089 [inline] btrfs_get_tree+0x5b3/0x2710 fs/btrfs/super.c:2123 vfs_get_tree+0x8e/0x330 fs/super.c:1751 fc_mount fs/namespace.c:1199 [inline] do_new_mount_fc fs/namespace.c:3636 [inline] do_new_mount fs/namespace.c:3712 [inline] path_mount+0x7bf/0x23a0 fs/namespace.c:4022 do_mount fs/namespace.c:4035 [inline] __do_sys_mount fs/namespace.c:4224 [inline] __se_sys_mount fs/namespace.c:4201 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:4201 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f350a58f7c9 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:00007f3509bdd038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f350a7e6090 RCX: 00007f350a58f7c9 RDX: 00002000000000c0 RSI: 0000200000000080 RDI: 00002000000001c0 RBP: 00007f350a613f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000004418 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f350a7e6128 R14: 00007f350a7e6090 R15: 00007ffc45633788 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:create_empty_buffers+0x4d/0x480 fs/buffer.c:1694 Code: ea 6d ff 48 89 de ba 40 8c 40 00 4c 89 ef e8 0a f6 ff ff 49 89 c6 48 89 c3 eb 03 48 89 c3 e8 1a ea 6d ff 48 89 d8 48 c1 e8 03 <80> 3c 28 00 0f 85 81 03 00 00 48 8d 7b 08 4c 09 23 48 89 f8 48 c1 RSP: 0018:ffffc900041ff870 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8250f9bc RDX: ffff8880375dc980 RSI: ffffffff8250fe96 RDI: ffff8880375de000 RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: ffffea0000d84a80 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007f3509bdd6c0(0000) GS:ffff8880d6af5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3509bdcf98 CR3: 000000002babe000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 6d insl (%dx),%es:(%rdi) 1: ff 48 89 decl -0x77(%rax) 4: de ba 40 8c 40 00 fidivrs 0x408c40(%rdx) a: 4c 89 ef mov %r13,%rdi d: e8 0a f6 ff ff call 0xfffff61c 12: 49 89 c6 mov %rax,%r14 15: 48 89 c3 mov %rax,%rbx 18: eb 03 jmp 0x1d 1a: 48 89 c3 mov %rax,%rbx 1d: e8 1a ea 6d ff call 0xff6dea3c 22: 48 89 d8 mov %rbx,%rax 25: 48 c1 e8 03 shr $0x3,%rax * 29: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) <-- trapping instruction 2d: 0f 85 81 03 00 00 jne 0x3b4 33: 48 8d 7b 08 lea 0x8(%rbx),%rdi 37: 4c 09 23 or %r12,(%rbx) 3a: 48 89 f8 mov %rdi,%rax 3d: 48 rex.W 3e: c1 .byte 0xc1 Tested on: commit: 623fb991 Merge tag 'pinctrl-v6.19-2' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15ed319a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=a11e0f726bfb6765 dashboard link: https://syzkaller.appspot.com/bug?extid=b4a2af3000eaa84d95d5 compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=16e55f92580000
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