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Mozilla Thunderbird Subject: Re: [syzbot] [btrfs?] kernel BUG in scrub_stripe_get_kaddr To: syzbot , clm@fb.com, dsterba@suse.com, josef@toxicpanda.com, linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com References: <68dae1e2.050a0220.1696c6.001f.GAE@google.com> Content-Language: en-US From: Qu Wenruo Autocrypt: addr=quwenruo.btrfs@gmx.com; keydata= xsBNBFnVga8BCACyhFP3ExcTIuB73jDIBA/vSoYcTyysFQzPvez64TUSCv1SgXEByR7fju3o 8RfaWuHCnkkea5luuTZMqfgTXrun2dqNVYDNOV6RIVrc4YuG20yhC1epnV55fJCThqij0MRL 1NxPKXIlEdHvN0Kov3CtWA+R1iNN0RCeVun7rmOrrjBK573aWC5sgP7YsBOLK79H3tmUtz6b 9Imuj0ZyEsa76Xg9PX9Hn2myKj1hfWGS+5og9Va4hrwQC8ipjXik6NKR5GDV+hOZkktU81G5 gkQtGB9jOAYRs86QG/b7PtIlbd3+pppT0gaS+wvwMs8cuNG+Pu6KO1oC4jgdseFLu7NpABEB AAHNIlF1IFdlbnJ1byA8cXV3ZW5ydW8uYnRyZnNAZ214LmNvbT7CwJQEEwEIAD4CGwMFCwkI BwIGFQgJCgsCBBYCAwECHgECF4AWIQQt33LlpaVbqJ2qQuHCPZHzoSX+qAUCZxF1YAUJEP5a sQAKCRDCPZHzoSX+qF+mB/9gXu9C3BV0omDZBDWevJHxpWpOwQ8DxZEbk9b9LcrQlWdhFhyn 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7xBRRzomuqb8p034Scynixi6cbx1jDLx9OhDPHfDIacRyN5G48szcb1h =E5=9C=A8 2025/9/30 05:15, syzbot =E5=86=99=E9=81=93: > Hello, >=20 > syzbot found the following issue on: >=20 > HEAD commit: 262858079afd Add linux-next specific files for 20250926 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=3D1562cae25800= 00 > kernel config: https://syzkaller.appspot.com/x/.config?x=3D6117d7eea7e1= f3a7 > dashboard link: https://syzkaller.appspot.com/bug?extid=3Dbde59221318c59= 2e6346 > compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b79= 76-1~exp1~20250708183702.136), Debian LLD 20.1.8 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=3D137abf1258= 0000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=3D1277f1425800= 00 >=20 > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/818c8ba6ac53/di= sk-26285807.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/da143e1d7f10/vmlin= ux-26285807.xz > kernel image: https://storage.googleapis.com/syzbot-assets/b73ae95dc148/= bzImage-26285807.xz > mounted in repro: https://storage.googleapis.com/syzbot-assets/27e0b3290= 872/mount_1.gz > fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=3D14= 77f142580000) >=20 > IMPORTANT: if you fix the issue, please add the following tag to the com= mit: > Reported-by: syzbot+bde59221318c592e6346@syzkaller.appspotmail.com >=20 > BTRFS info (device loop0): force clearing of disk cache > BTRFS info (device loop0): enabling auto defrag > BTRFS info (device loop0): max_inline set to 0 > BTRFS info (device loop0): scrub: started on devid 1 > assertion failed: !folio_test_partial_kmap(folio) :: 0, in fs/btrfs/scru= b.c:697 This is caused by the config CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP=3Dy, which= =20 forces every folio_test_partial_kmap() to always return true. I'm not sure how this config would help in the real world, especially=20 for cases where we can control the folio being allocated, and on 64bits=20 systems where kmap_local*() is just no-op. Anyway I'll change all those folio_test_partial_kmap() usages in=20 ASSERT()s to folio_test_highmem() directly. Thanks, Qu > ------------[ cut here ]------------ > kernel BUG at fs/btrfs/scrub.c:697! > Oops: invalid opcode: 0000 [#1] SMP KASAN PTI > CPU: 0 UID: 0 PID: 6077 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(= full) > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS = Google 08/18/2025 > RIP: 0010:scrub_stripe_get_kaddr+0x1bb/0x1c0 fs/btrfs/scrub.c:697 > Code: 0f 0b e8 b8 14 db fd 48 c7 c7 60 8d ef 8b 48 c7 c6 a0 9f ef 8b 31 = d2 48 c7 c1 20 8e ef 8b 41 b8 b9 02 00 00 e8 86 58 42 fd 90 <0f> 0b 0f 1f = 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 > RSP: 0018:ffffc9000354f0d0 EFLAGS: 00010246 > RAX: 000000000000004f RBX: ffff88805bfa0010 RCX: f481606445f80d00 > RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 > RBP: 000000000000000c R08: ffffc9000354ede7 R09: 1ffff920006a9dbc > R10: dffffc0000000000 R11: fffff520006a9dbd R12: dffffc0000000000 > R13: dffffc0000000000 R14: ffff88805bfa0010 R15: 000000000000000c > FS: 000055556411a500(0000) GS:ffff8881259fc000(0000) knlGS:000000000000= 0000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f34bfdf2b60 CR3: 000000007537c000 CR4: 00000000003526f0 > Call Trace: > > scrub_bio_add_sector fs/btrfs/scrub.c:932 [inline] > scrub_submit_initial_read+0xf21/0x1120 fs/btrfs/scrub.c:1897 > submit_initial_group_read+0x423/0x5b0 fs/btrfs/scrub.c:1952 > flush_scrub_stripes+0x18f/0x1150 fs/btrfs/scrub.c:1973 > scrub_stripe+0xbea/0x2a30 fs/btrfs/scrub.c:2516 > scrub_chunk+0x2a3/0x430 fs/btrfs/scrub.c:2575 > scrub_enumerate_chunks+0xa70/0x1350 fs/btrfs/scrub.c:2839 > btrfs_scrub_dev+0x6e7/0x10e0 fs/btrfs/scrub.c:3153 > btrfs_ioctl_scrub+0x249/0x4b0 fs/btrfs/ioctl.c:3163 > vfs_ioctl fs/ioctl.c:51 [inline] > __do_sys_ioctl fs/ioctl.c:597 [inline] > __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7f2f5d78eec9 > 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:00007ffef70163e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 > RAX: ffffffffffffffda RBX: 00007f2f5d9e5fa0 RCX: 00007f2f5d78eec9 > RDX: 0000200000000000 RSI: 00000000c400941b RDI: 0000000000000004 > RBP: 00007f2f5d811f91 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 > R13: 00007f2f5d9e5fa0 R14: 00007f2f5d9e5fa0 R15: 0000000000000003 > > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:scrub_stripe_get_kaddr+0x1bb/0x1c0 fs/btrfs/scrub.c:697 > Code: 0f 0b e8 b8 14 db fd 48 c7 c7 60 8d ef 8b 48 c7 c6 a0 9f ef 8b 31 = d2 48 c7 c1 20 8e ef 8b 41 b8 b9 02 00 00 e8 86 58 42 fd 90 <0f> 0b 0f 1f = 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 > RSP: 0018:ffffc9000354f0d0 EFLAGS: 00010246 > RAX: 000000000000004f RBX: ffff88805bfa0010 RCX: f481606445f80d00 > RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 > RBP: 000000000000000c R08: ffffc9000354ede7 R09: 1ffff920006a9dbc > R10: dffffc0000000000 R11: fffff520006a9dbd R12: dffffc0000000000 > R13: dffffc0000000000 R14: ffff88805bfa0010 R15: 000000000000000c > FS: 000055556411a500(0000) GS:ffff888125afc000(0000) knlGS:000000000000= 0000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000556796dbd950 CR3: 000000007537c000 CR4: 00000000003526f0 >=20 >=20 > --- > This report is generated by a bot. 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