On 12/12/24 05:56, Lai, Yi wrote: > Hi Matthew Wilcox, > > Greetings! > > I used Syzkaller and found that there is WARNING in __alloc_frozen_pages_noprof in linux v6.13-rc2. > > After bisection and the first bad commit is: > " > 9181a585d2d1 mm/page_alloc: add __alloc_frozen_pages() > " > > The WARNING related to __alloc_frozen_pages_noprof and v9fs was also reported in https://syzkaller.appspot.com/bug?extid=03fb58296859d8dbab4d. I hope following trace can be insightful to you. The warning has existed before 9181a585d2d1 but the function was called __alloc_pages_noprof. So there must be prior reports to this, and indeed it's callers' fault. Can anything be done to make sure it's no longer reported as new nor bisected to the commit, just because the name of the function changed? > > All detailed into can be found at: > https://github.com/laifryiee/syzkaller_logs/tree/main/241211_183256___alloc_frozen_pages_noprof > Syzkaller repro code: > https://github.com/laifryiee/syzkaller_logs/tree/main/241211_183256___alloc_frozen_pages_noprof/repro.c > Syzkaller repro syscall steps: > https://github.com/laifryiee/syzkaller_logs/tree/main/241211_183256___alloc_frozen_pages_noprof/repro.prog > Syzkaller report: > https://github.com/laifryiee/syzkaller_logs/tree/main/241211_183256___alloc_frozen_pages_noprof/repro.report > Kconfig(make olddefconfig): > https://github.com/laifryiee/syzkaller_logs/tree/main/241211_183256___alloc_frozen_pages_noprof/kconfig_origin > Bisect info: > https://github.com/laifryiee/syzkaller_logs/tree/main/241211_183256___alloc_frozen_pages_noprof/bisect_info.log > bzImage: > https://github.com/laifryiee/syzkaller_logs/raw/refs/heads/main/241211_183256___alloc_frozen_pages_noprof/bzImage_d1486dca38afd08ca279ae94eb3a397f10737824 > Issue dmesg: > https://github.com/laifryiee/syzkaller_logs/blob/main/241211_183256___alloc_frozen_pages_noprof/d1486dca38afd08ca279ae94eb3a397f10737824_dmesg.log > > " > [ 189.747738] ------------[ cut here ]------------ > Stopping Security Auditing Service... > [ 189.751119] WARNING: CPU: 0 PID: 238 at mm/page_alloc.c:4771 __alloc_frozen_pages_noprof+0x576/0x6f0 > [ 189.753512] Modules linked in: > [ 189.754083] CPU: 0 UID: 0 PID: 238 Comm: auditd Not tainted 6.13.0-rc2-next-20241209-d1486dca38af #1 > [ 189.756130] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/014 > [ 189.759592] RIP: 0010:__alloc_frozen_pages_noprof+0x576/0x6f0 > [ 189.761360] Code: e8 af af ec ff e9 f7 fc ff ff 83 fe 0a 0f 86 7b fb ff ff 45 31 ff 80 3d 89 49 de 05 00 0f 85 f6 fd ff ff0 > [ 189.765443] RSP: 0018:ffff888012c1f658 EFLAGS: 00010246 > [ 189.766578] RAX: 0000000000000000 RBX: 1ffff11002583ed1 RCX: 0000000000000000 > [ 189.768810] RDX: 0000000000000000 RSI: 0000000000000014 RDI: 0000000000000000 > [ 189.771063] RBP: ffff888012c1f750 R08: 0000000000000000 R09: fffffbfff0f975c4 > [ 189.772519] R10: ffff888012c1f878 R11: 0000000000000001 R12: 0000000000040cc0 > [ 189.774822] R13: 0000000000000014 R14: ffff888012c1f728 R15: 0000000000000000 > [ 189.776145] FS: 00007fc6bb494880(0000) GS:ffff88806c400000(0000) knlGS:0000000000000000 > [ 189.778771] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 189.780188] CR2: 00007fc6bb270a30 CR3: 0000000016aba002 CR4: 0000000000770ef0 > [ 189.781624] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > [ 189.783966] DR3: 0000000000000000 DR6: 00000000ffff07f0 DR7: 0000000000000400 > [ 189.785798] PKRU: 55555554 > [ 189.786490] Call Trace: > [ 189.787195] <TASK> > [ 189.787635] ? show_regs+0x6d/0x80 > [ 189.788322] ? __warn+0xf3/0x390 > [ 189.788888] ? report_bug+0x25e/0x4b0 > [ 189.790113] ? __alloc_frozen_pages_noprof+0x576/0x6f0 > [ 189.791759] ? report_bug+0x2cb/0x4b0 > [ 189.792877] ? print_usage_bug.part.0+0x5a0/0x610 > [ 189.794491] ? __alloc_frozen_pages_noprof+0x576/0x6f0 > [ 189.796095] ? __alloc_frozen_pages_noprof+0x577/0x6f0 > [ 189.797685] ? handle_bug+0xf1/0x190 > [ 189.798919] ? exc_invalid_op+0x3c/0x80 > [ 189.800138] ? asm_exc_invalid_op+0x1f/0x30 > [ 189.801470] ? __alloc_frozen_pages_noprof+0x576/0x6f0 > [ 189.802686] ? __pfx___alloc_frozen_pages_noprof+0x10/0x10 > [ 189.804058] ? __pfx___lock_acquire+0x10/0x10 > [ 189.804811] __alloc_pages_noprof+0x16/0x80 > [ 189.805508] ___kmalloc_large_node+0x96/0x150 > [ 189.806514] __kmalloc_large_node_noprof+0x23/0x100 > [ 189.808223] __kmalloc_noprof+0x3f3/0x560 > [ 189.809494] ? audit_receive_msg+0xa72/0x2a90 > [ 189.810924] ? ns_capable+0xec/0x130 > [ 189.812066] audit_receive_msg+0xa72/0x2a90 > [ 189.813332] ? audit_receive_msg+0xa72/0x2a90 > [ 189.814436] ? __pfx_audit_receive_msg+0x10/0x10 > [ 189.815399] ? __pfx___lock_acquire+0x10/0x10 > [ 189.816661] ? __pfx___mutex_lock+0x10/0x10 > [ 189.817887] ? __this_cpu_preempt_check+0x21/0x30 > [ 189.818987] ? lock_release+0x441/0x870 > [ 189.820225] audit_receive+0x282/0x450 > [ 189.821109] ? __pfx_audit_receive+0x10/0x10 > [ 189.821842] ? netlink_deliver_tap+0x1b9/0xca0 > [ 189.822626] ? __kasan_check_write+0x18/0x20 > [ 189.823761] netlink_unicast+0x5a3/0x870 > [ 189.824983] ? __pfx_netlink_unicast+0x10/0x10 > [ 189.826359] ? __sanitizer_cov_trace_cmp8+0x1c/0x30 > [ 189.827886] ? __check_object_size+0x43/0x8e0 > [ 189.829290] netlink_sendmsg+0x956/0xe80 > [ 189.830525] ? __pfx_netlink_sendmsg+0x10/0x10 > [ 189.831367] ? _copy_from_user+0x77/0xa0 > [ 189.832159] ? __sanitizer_cov_trace_const_cmp8+0x1c/0x30 > [ 189.833811] __sys_sendto+0x563/0x5c0 > [ 189.835087] ? __pfx___sys_sendto+0x10/0x10 > [ 189.836408] ? lock_acquire+0x80/0xb0 > [ 189.837121] ? __seccomp_filter+0x5f3/0x1160 > [ 189.837875] ? __pfx___seccomp_filter+0x10/0x10 > [ 189.838646] ? __x64_sys_rt_sigaction+0x215/0x370 > [ 189.839541] __x64_sys_sendto+0xe9/0x1b0 > [ 189.840419] ? syscall_trace_enter+0x9f/0x280 > [ 189.841791] x64_sys_call+0x1df1/0x2140 > [ 189.843072] do_syscall_64+0x6d/0x140 > [ 189.844244] entry_SYSCALL_64_after_hwframe+0x76/0x7e > [ 189.845806] RIP: 0033:0x7fc6bb34faf6 > [ 189.847030] Code: c1 f4 ff 44 8b 4c 24 2c 4c 8b 44 24 20 41 89 c4 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 248 > [ 189.851934] RSP: 002b:00007fffdf8dd480 EFLAGS: 00000293 ORIG_RAX: 000000000000002c > [ 189.853337] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc6bb34faf6 > [ 189.855569] RDX: 0000000000000010 RSI: 00007fffdf8dd4f0 RDI: 0000000000000003 > [ 189.856912] RBP: 0000000000000010 R08: 00007fffdf8dd4dc R09: 000000000000000c > [ 189.859108] R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 > [ 189.860685] R13: 00007fffdf8dd4f0 R14: 00007fffdf8dd4dc R15: 00000000000003f2 > [ 189.862615] </TASK> > [ 189.863375] irq event stamp: 49885 > [ 189.864295] hardirqs last enabled at (49893): [<ffffffff8165f305>] __up_console_sem+0x95/0xb0 > [ 189.866318] hardirqs last disabled at (49900): [<ffffffff8165f2ea>] __up_console_sem+0x7a/0xb0 > [ 189.868457] softirqs last enabled at (49914): [<ffffffff8148974e>] __irq_exit_rcu+0x10e/0x170 > [ 189.869882] softirqs last disabled at (49909): [<ffffffff8148974e>] __irq_exit_rcu+0x10e/0x170 > [ 189.871298] ---[ end trace 0000000000000000 ]--- > " > > Regards, > Yi Lai > > --- > > If you don't need the following environment to reproduce the problem or if you > already have one reproduced environment, please ignore the following information. > > How to reproduce: > git clone https://gitlab.com/xupengfe/repro_vm_env.git > cd repro_vm_env > tar -xvf repro_vm_env.tar.gz > cd repro_vm_env; ./start3.sh // it needs qemu-system-x86_64 and I used v7.1.0 > // start3.sh will load bzImage_2241ab53cbb5cdb08a6b2d4688feb13971058f65 v6.2-rc5 kernel > // You could change the bzImage_xxx as you want > // Maybe you need to remove line "-drive if=pflash,format=raw,readonly=on,file=./OVMF_CODE.fd \" for different qemu version > You could use below command to log in, there is no password for root. > ssh -p 10023 root@localhost > > After login vm(virtual machine) successfully, you could transfer reproduced > binary to the vm by below way, and reproduce the problem in vm: > gcc -pthread -o repro repro.c > scp -P 10023 repro root@localhost:/root/ > > Get the bzImage for target kernel: > Please use target kconfig and copy it to kernel_src/.config > make olddefconfig > make -jx bzImage //x should equal or less than cpu num your pc has > > Fill the bzImage file into above start3.sh to load the target kernel in vm. > > > Tips: > If you already have qemu-system-x86_64, please ignore below info. > If you want to install qemu v7.1.0 version: > git clone https://github.com/qemu/qemu.git > cd qemu > git checkout -f v7.1.0 > mkdir build > cd build > yum install -y ninja-build.x86_64 > yum -y install libslirp-devel.x86_64 > ../configure --target-list=x86_64-softmmu --enable-kvm --enable-vnc --enable-gtk --enable-sdl --enable-usb-redir --enable-slirp > make > make install >
