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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, Apr 09, 2025 at 04:57:48PM +0200, Aleksandr Nogikh wrote: > On Mon, Apr 7, 2025 at 12:28 PM Lorenzo Stoakes > wrote: > > > > On Mon, Apr 07, 2025 at 12:13:19PM +0200, Aleksandr Nogikh wrote: > > > Hi Lorenzo, > > > > > > Thanks for looking at the report! > > > > > > On Mon, Apr 7, 2025 at 12:09 PM 'Lorenzo Stoakes' via syzkaller-bugs > > > wrote: > > > > > > > > I did actually try to mark this fixed, but apparently syz fix doesn't work or > > > > doesn't prevent other syzbots from duplicating reports. > > > > > > This part is not very clear - why would #syz fix: title not work well here? > > > > Sorry for not being clear. What I mean is that I already did this on > > another thread with the same, duplicate, report - and then received this > > one afterwards. > > > > This suggests to me that this does nothing, or does nothing useful at least > > if other bots will just keep on reporting the same thing. > > When syzbot receives the #syz fix command, it keeps the bug open until > the fixing commit has reached all the kernel trees it fuzzes. After > that, if the bug is seen again, it's reported as a separate issue with > the (2) suffix, then (3), etc. > > If the bug manifested itself with different crash titles, marking just > one report as fixed won't affect others indeed - if syzbot knew they > were related, it would not have reported them separately. Yeah this is what I suspected. I mean you could take file/line, but then that'll vary at different merge commits potentially and it's clearly a non-trivial problem. > > What was the other thread/bug in this case? Maybe we could adjust our > kernel crash log parsing rules to prevent similar duplicates. The [0] referenced below. But not sure how easy it'd be to recognise. > > > > > I appreciate that recognising that it is the same issue might not be > > trivial, but obviously it's not a hugely great use of my time to repeatedly > > chase this stuff up when the fix is already upstream and I've already > > -manually- confirmed it works. > > > > My patience with it was somewhat eroded from my experience of telling > > syzbot in the previous thread [0] to re-test, twice, and it failing to do > > so due to broken presumably VM images, leading to me having to manually > > test the same fix I already tested and fixed a while ago etc. etc. > > > > [0]: https://lore.kernel.org/all/bee2d5f5-db93-42f1-829e-3fd250649ca8@lucifer.local/ > > FWIW the "unregister_netdevice: waiting for batadv0 to become free. > Usage count = 3" bug is discussed here: > > https://lore.kernel.org/all/CANp29Y5RjJD3FK8zciRL92f0+tXEaZ=DbzSF3JrnVRGyDmag2A@mail.gmail.com/t/#u > > This is an actual bug in v6.15-rc1 that's plaguing Linux kernel > fuzzing on syzbot at the moment. Ugh well in that case apologies, I assumed some VM setup issue :) > > > > > We do very much appreciate syzbot reports, don't get me wrong here, but I > > do also have to partition my time somewhat :) > > > > So I'm afraid I can't promise to always do syz fix updates on this basis. > > Sure. > > Also please feel free to ping us whenever syzbot's behavior is annoying you :) Cheers, you guys have always been responsive even when I grumble inanely :) Though you might get quite a few emails :P Mostly syzbot is really useful and has caught multiple very real things, but when it is noisy it can be pretty noisy :) Hopefully we can help sort out tractable problems, I guess we have to accept a certain amount of noise though as a biproduct. But sure, will raise issues moving forward also! Cheers, Lorenzo > > -- > Aleksandr > > > > > Cheers, Lorenzo > > > > > > > > > > > > > Anyway, this is fixed in commit 36eed5400805 ("mm/mremap: do not set > > > > vrm->vma NULL immediately prior to checking it"), was fixed a long time > > > > ago, as soon as reported, and it's been a matter of waiting for this to > > > > land in Linus's tree. > > > > > > > > This is now fixed, upstream, and this report is - as a result - redundant. > > > > > > > > Thanks, Lorenzo > > > > > > -- > > > Aleksandr > > > > > > > > > > > On Sat, Apr 05, 2025 at 05:16:31PM -0700, syzbot wrote: > > > > > Hello, > > > > > > > > > > syzbot found the following issue on: > > > > > > > > > > HEAD commit: a2cc6ff5ec8f Merge tag 'firewire-updates-6.15' of git://gi.. > > > > > git tree: upstream > > > > > console+strace: https://syzkaller.appspot.com/x/log.txt?x=11ab27cf980000 > > > > > kernel config: https://syzkaller.appspot.com/x/.config?x=adffebefc9feb9d6 > > > > > dashboard link: https://syzkaller.appspot.com/bug?extid=5250c4727db03e3436cc > > > > > compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 > > > > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1693d404580000 > > > > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=178ac94c580000 > > > > > > > > > > Downloadable assets: > > > > > disk image: https://storage.googleapis.com/syzbot-assets/8ecd2318067e/disk-a2cc6ff5.raw.xz > > > > > vmlinux: https://storage.googleapis.com/syzbot-assets/05691b82062c/vmlinux-a2cc6ff5.xz > > > > > kernel image: https://storage.googleapis.com/syzbot-assets/4698994e99d4/bzImage-a2cc6ff5.xz > > > > > > > > > > The issue was bisected to: > > > > > > > > > > commit d5c8aec0542e2d79b64de9089b88fabdebe05c1e > > > > > Author: Lorenzo Stoakes > > > > > Date: Mon Mar 10 20:50:37 2025 +0000 > > > > > > > > > > mm/mremap: initial refactor of move_vma() > > > > > > > > > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11ff2a74580000 > > > > > final oops: https://syzkaller.appspot.com/x/report.txt?x=13ff2a74580000 > > > > > console output: https://syzkaller.appspot.com/x/log.txt?x=15ff2a74580000 > > > > > > > > > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > > > > > Reported-by: syzbot+5250c4727db03e3436cc@syzkaller.appspotmail.com > > > > > Fixes: d5c8aec0542e ("mm/mremap: initial refactor of move_vma()") > > > > > > > > > > Code: 48 83 c4 28 c3 e8 17 1a 00 00 0f 1f 80 00 00 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 b8 ff ff ff f7 d8 64 89 01 48 > > > > > RSP: 002b:00007fff0b8738c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000019 > > > > > RAX: ffffffffffffffda RBX: 00007fff0b8738d0 RCX: 00007f46ffb182e9 > > > > > RDX: 0000000000003000 RSI: 0000000000001000 RDI: 0000200000ffc000 > > > > > RBP: 0000000000000001 R08: 0000200000ffa000 R09: 00007f46ffb80031 > > > > > R10: 0000000000000000 R11: 0000000000000246 R12: 00007f46ffb83618 > > > > > R13: 00007fff0b873aa8 R14: 0000000000000001 R15: 0000000000000001 > > > > > > > > > > Oops: general protection fault, probably for non-canonical address 0xdffffc0000000004: 0000 [#1] SMP KASAN NOPTI > > > > > KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027] > > > > > CPU: 0 UID: 0 PID: 5820 Comm: syz-executor115 Not tainted 6.14.0-syzkaller-12966-ga2cc6ff5ec8f #0 PREEMPT(full) > > > > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 > > > > > RIP: 0010:vrm_uncharge mm/mremap.c:964 [inline] > > > > > RIP: 0010:expand_vma_in_place mm/mremap.c:1566 [inline] > > > > > RIP: 0010:expand_vma mm/mremap.c:1621 [inline] > > > > > RIP: 0010:mremap_at mm/mremap.c:1682 [inline] > > > > > RIP: 0010:do_mremap mm/mremap.c:1727 [inline] > > > > > RIP: 0010:__do_sys_mremap+0x1392/0x15c0 mm/mremap.c:1784 > > > > > Code: 0f 85 45 02 00 00 48 8b 04 24 c6 84 24 70 01 00 00 01 48 01 85 68 02 00 00 eb 9a e8 18 34 af ff 48 b8 04 00 00 00 00 fc ff df <80> 38 00 0f 85 a7 01 00 00 48 8b 2c 25 20 00 00 00 31 ff 81 e5 00 > > > > > RSP: 0018:ffffc900039dfd20 EFLAGS: 00010293 > > > > > RAX: dffffc0000000004 RBX: ffff88802b765a00 RCX: ffffffff821183c6 > > > > > RDX: ffff88805c7b8000 RSI: ffffffff820c0cb8 RDI: 0000000000000005 > > > > > RBP: ffff8880341fb780 R08: 0000000000000005 R09: 0000000000000000 > > > > > R10: 00000000fffffff4 R11: 0000000000000001 R12: 0000000000002000 > > > > > R13: 1ffff9200073bfaa R14: 0000200000ffc000 R15: ffff88802b765b70 > > > > > FS: 00005555814db380(0000) GS:ffff8881249b8000(0000) knlGS:0000000000000000 > > > > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > > > > CR2: 00007fff0b8728e0 CR3: 000000007802e000 CR4: 00000000003526f0 > > > > > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > > > > > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > > > > Call Trace: > > > > > > > > > > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > > > > > do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 > > > > > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > > > > RIP: 0033:0x7f46ffb182e9 > > > > > Code: 48 83 c4 28 c3 e8 17 1a 00 00 0f 1f 80 00 00 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 b8 ff ff ff f7 d8 64 89 01 48 > > > > > RSP: 002b:00007fff0b8738c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000019 > > > > > RAX: ffffffffffffffda RBX: 00007fff0b8738d0 RCX: 00007f46ffb182e9 > > > > > RDX: 0000000000003000 RSI: 0000000000001000 RDI: 0000200000ffc000 > > > > > RBP: 0000000000000001 R08: 0000200000ffa000 R09: 00007f46ffb80031 > > > > > R10: 0000000000000000 R11: 0000000000000246 R12: 00007f46ffb83618 > > > > > R13: 00007fff0b873aa8 R14: 0000000000000001 R15: 0000000000000001 > > > > > > > > > > Modules linked in: > > > > > ---[ end trace 0000000000000000 ]--- > > > > > RIP: 0010:vrm_uncharge mm/mremap.c:964 [inline] > > > > > RIP: 0010:expand_vma_in_place mm/mremap.c:1566 [inline] > > > > > RIP: 0010:expand_vma mm/mremap.c:1621 [inline] > > > > > RIP: 0010:mremap_at mm/mremap.c:1682 [inline] > > > > > RIP: 0010:do_mremap mm/mremap.c:1727 [inline] > > > > > RIP: 0010:__do_sys_mremap+0x1392/0x15c0 mm/mremap.c:1784 > > > > > Code: 0f 85 45 02 00 00 48 8b 04 24 c6 84 24 70 01 00 00 01 48 01 85 68 02 00 00 eb 9a e8 18 34 af ff 48 b8 04 00 00 00 00 fc ff df <80> 38 00 0f 85 a7 01 00 00 48 8b 2c 25 20 00 00 00 31 ff 81 e5 00 > > > > > RSP: 0018:ffffc900039dfd20 EFLAGS: 00010293 > > > > > RAX: dffffc0000000004 RBX: ffff88802b765a00 RCX: ffffffff821183c6 > > > > > RDX: ffff88805c7b8000 RSI: ffffffff820c0cb8 RDI: 0000000000000005 > > > > > RBP: ffff8880341fb780 R08: 0000000000000005 R09: 0000000000000000 > > > > > R10: 00000000fffffff4 R11: 0000000000000001 R12: 0000000000002000 > > > > > R13: 1ffff9200073bfaa R14: 0000200000ffc000 R15: ffff88802b765b70 > > > > > FS: 00005555814db380(0000) GS:ffff8881249b8000(0000) knlGS:0000000000000000 > > > > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > > > > CR2: 00007fff0b8728e0 CR3: 000000007802e000 CR4: 00000000003526f0 > > > > > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > > > > > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > > > > ---------------- > > > > > Code disassembly (best guess): > > > > > 0: 48 83 c4 28 add $0x28,%rsp > > > > > 4: c3 ret > > > > > 5: e8 17 1a 00 00 call 0x1a21 > > > > > a: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) > > > > > 11: 48 89 f8 mov %rdi,%rax > > > > > 14: 48 89 f7 mov %rsi,%rdi > > > > > 17: 48 89 d6 mov %rdx,%rsi > > > > > 1a: 48 89 ca mov %rcx,%rdx > > > > > 1d: 4d 89 c2 mov %r8,%r10 > > > > > 20: 4d 89 c8 mov %r9,%r8 > > > > > 23: 4c 8b 4c 24 08 mov 0x8(%rsp),%r9 > > > > > 28: 0f 05 syscall > > > > > * 2a: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax <-- trapping instruction > > > > > 30: 73 01 jae 0x33 > > > > > 32: c3 ret > > > > > 33: 48 c7 c1 b8 ff ff ff mov $0xffffffffffffffb8,%rcx > > > > > 3a: f7 d8 neg %eax > > > > > 3c: 64 89 01 mov %eax,%fs:(%rcx) > > > > > 3f: 48 rex.W > > > > > > > > > > > > > > > --- > > > > > This report is generated by a bot. It may contain errors. > > > > > See https://goo.gl/tpsmEJ for more information about syzbot. > > > > > syzbot engineers can be reached at syzkaller@googlegroups.com. > > > > > > > > > > syzbot will keep track of this issue. See: > > > > > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > > > > > For information about bisection process see: https://goo.gl/tpsmEJ#bisection > > > > > > > > > > If the report is already addressed, let syzbot know by replying with: > > > > > #syz fix: exact-commit-title > > > > > > > > > > If you want syzbot to run the reproducer, reply with: > > > > > #syz test: git://repo/address.git branch-or-commit-hash > > > > > If you attach or paste a git patch, syzbot will apply it before testing. > > > > > > > > > > If you want to overwrite report's subsystems, reply with: > > > > > #syz set subsystems: new-subsystem > > > > > (See the list of subsystem names on the web dashboard) > > > > > > > > > > If the report is a duplicate of another one, reply with: > > > > > #syz dup: exact-subject-of-another-report > > > > > > > > > > If you want to undo deduplication, reply with: > > > > > #syz undup > > > > > > > > -- > > >