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edpZy6Xim4V3ertjszgNeV3FsD3dI4f6mxkNqvj6dzUXEpKdWSyQ2MIw/dND1OZkbfcFt9PfQVkwjdIZEUZIWuCsywLXM6hlox527V+/aZwvjlkTJ+vmf4NvH7Dxsx+k 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: * Sasha Levin [241013 09:29]: > On Thu, Oct 10, 2024 at 04:28:18PM +0100, Lorenzo Stoakes wrote: > > On Thu, Oct 10, 2024 at 08:19:28AM -0700, syzbot wrote: > > > Hello, > > >=20 > > > syzbot found the following issue on: > > >=20 > > > HEAD commit: d3d1556696c1 Merge tag 'mm-hotfixes-stable-2024-10-09= -15-4.. > > > git tree: upstream > > > console output: https://syzkaller.appspot.com/x/log.txt?x=3D10416fd05= 80000 > > > kernel config: https://syzkaller.appspot.com/x/.config?x=3D7a3fccdd0= bb995 > > > dashboard link: https://syzkaller.appspot.com/bug?extid=3D39bc767144c= 55c8db0ea > > > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for= Debian) 2.40 > > >=20 > > > Unfortunately, I don't have any reproducer for this issue yet. > > >=20 > > > Downloadable assets: > > > disk image: https://storage.googleapis.com/syzbot-assets/0600b551e610= /disk-d3d15566.raw.xz > > > vmlinux: https://storage.googleapis.com/syzbot-assets/d59d43ed3976/vm= linux-d3d15566.xz > > > kernel image: https://storage.googleapis.com/syzbot-assets/e686a3e7e0= d6/bzImage-d3d15566.xz > > >=20 > > > IMPORTANT: if you fix the issue, please add the following tag to the = commit: > > > Reported-by: syzbot+39bc767144c55c8db0ea@syzkaller.appspotmail.com > > >=20 > > > INFO: task syz.3.917:7739 blocked for more than 146 seconds. > > > Not tainted 6.12.0-rc2-syzkaller-00074-gd3d1556696c1 #0 > > > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this mess= age. > > > task:syz.3.917 state:D stack:23808 pid:7739 tgid:7739 ppid:52= 32 flags:0x00004000 > > > Call Trace: > > > > > > context_switch kernel/sched/core.c:5322 [inline] > > > __schedule+0x1843/0x4ae0 kernel/sched/core.c:6682 > > > __schedule_loop kernel/sched/core.c:6759 [inline] > > > schedule+0x14b/0x320 kernel/sched/core.c:6774 > > > schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6831 > > > rwsem_down_write_slowpath+0xeee/0x13b0 kernel/locking/rwsem.c:1176 > > > __down_write_common kernel/locking/rwsem.c:1304 [inline] > > > __down_write kernel/locking/rwsem.c:1313 [inline] > > > down_write+0x1d7/0x220 kernel/locking/rwsem.c:1578 > > > mmap_write_lock include/linux/mmap_lock.h:106 [inline] > > > exit_mmap+0x2bd/0xc40 mm/mmap.c:1872 > >=20 > > Hmm, task freezing up or system becoming unstable/locked up is reminsec= ent > > of the maple tree bug I fixed in [0], which is still in the unstable ho= tfix > > branch. > >=20 > > This is likely not going to repro as it's quite heisenbug-ish to trigge= r > > and the failures are like this - somewhat disconnected from the cause, = so > > not sure if there is any case to speed this to Linus's tree. > >=20 > > On the other hand it's a pretty serious problem for stability and likel= y to > > continue to manifest in nasty ways like this. > >=20 > > Can't be 100% sure this is the cause, but seems likely. > >=20 > > [0]:https://lore.kernel.org/linux-mm/48b349a2a0f7c76e18772712d0997a5e12= ab0a3b.1728314403.git.lorenzo.stoakes@oracle.com/ >=20 > On my Debian build box, running a 6.1 kernel, I've started hitting a > similar issue: >=20 > Oct 12 17:24:01 debian kernel: INFO: task sed:3557356 blocked for more th= an 1208 seconds. > Oct 12 17:24:01 debian kernel: Not tainted 6.1.0-26-amd64 #1 Debian= 6.1.112-1 > Oct 12 17:24:01 debian kernel: "echo 0 > /proc/sys/kernel/hung_task_timeo= ut_secs" disables this message. > Oct 12 17:24:01 debian kernel: task:sed state:D stack:0 p= id:3557356 ppid:1 flags:0x00000002 > Oct 12 17:24:01 debian kernel: Call Trace: > Oct 12 17:24:01 debian kernel: > Oct 12 17:24:01 debian kernel: __schedule+0x34d/0x9e0 > Oct 12 17:24:01 debian kernel: schedule+0x5a/0xd0 > Oct 12 17:24:01 debian kernel: rwsem_down_write_slowpath+0x311/0x6d0 > Oct 12 17:24:01 debian kernel: exit_mmap+0xf6/0x2f0 > Oct 12 17:24:01 debian kernel: __mmput+0x3e/0x130 > Oct 12 17:24:01 debian kernel: do_exit+0x2fc/0xaf0 > Oct 12 17:24:01 debian kernel: do_group_exit+0x2d/0x80 > Oct 12 17:24:01 debian kernel: __x64_sys_exit_group+0x14/0x20 > Oct 12 17:24:01 debian kernel: do_syscall_64+0x55/0xb0 > Oct 12 17:24:01 debian kernel: ? do_fault+0x1a4/0x410 > Oct 12 17:24:01 debian kernel: ? __handle_mm_fault+0x660/0xfa0 > Oct 12 17:24:01 debian kernel: ? exit_to_user_mode_prepare+0x40/0x1e0 > Oct 12 17:24:01 debian kernel: ? handle_mm_fault+0xdb/0x2d0 > Oct 12 17:24:01 debian kernel: ? do_user_addr_fault+0x1b0/0x550 > Oct 12 17:24:01 debian kernel: ? exit_to_user_mode_prepare+0x40/0x1e0 > Oct 12 17:24:01 debian kernel: entry_SYSCALL_64_after_hwframe+0x6e/0xd8 > Oct 12 17:24:01 debian kernel: RIP: 0033:0x7f797d75a349 > Oct 12 17:24:01 debian kernel: RSP: 002b:00007fff37f0d3c8 EFLAGS: 0000024= 6 ORIG_RAX: 00000000000000e7 > Oct 12 17:24:01 debian kernel: RAX: ffffffffffffffda RBX: 00007f797d8549e= 0 RCX: 00007f797d75a349 > Oct 12 17:24:01 debian kernel: RDX: 000000000000003c RSI: 00000000000000e= 7 RDI: 0000000000000000 > Oct 12 17:24:01 debian kernel: RBP: 0000000000000000 R08: fffffffffffffe9= 8 R09: 00007fff37f0d2df > Oct 12 17:24:01 debian kernel: R10: 00007fff37f0d240 R11: 000000000000024= 6 R12: 00007f797d8549e0 > Oct 12 17:24:01 debian kernel: R13: 00007f797d85a2e0 R14: 000000000000000= 2 R15: 00007f797d85a2c8 > Oct 12 17:24:01 debian kernel: >=20 > It reproduces fairly easily during a kernel build... >=20 > It doesn't sound like the same issue you're pointing out, right Lorenzo? It could be. I suspect there has been a change recently that has made the bug possible - although, I've not put effort into finding out yet if that is true. If the bug existed for a long time (probably since I fixed the live locking issue in 6.4 that was backported), then you could be hitting it. It is a single line fix. If it happens frequently enough, you could try it - this fix will go through the backporting route once it lands. Although, I am not sure it has much to do with the maple tree as I don't think anyone should have the mm to take the mmap write lock. If we were stuck in the maple tree somehow, the mm wouldn't reach the exit_mmap() path - unless I missed something? If you can dump the running tasks when you hit it, we could get a clue from the (probably numerous) backtraces? Thanks, Liam