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AHgh+Roj61Qm3b0lxiPeGIjoV2WZb824HnDMoP47IuZTpfBxwVI1HtNwEdNz27dCj503dnpoGY2CiqGZkmp9oM4=@vger.kernel.org X-Gm-Message-State: AFuF++nDOs5v8pJuxpeBUr7kZJAU6n/NfL8L0pV4WDB7XGzitYZ+Q8xC /clrYYZrRonD57rUPwiRBVhrQZVfedlAA7rRovYlNc3KaEo9AkXpPT7OXNDdgnwvxC0xUGlaYYy XpluNEdrjtTePW7ibAKwAArQNPUEKccOILrQWoAo9lpp9rOJPl0e5rp235rA= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:c197:b0:4b3:89ae:df60 with SMTP id 5614622812f47-4b398342e94mr21728714b6e.16.1788102209400; Sun, 30 Aug 2026 08:03:29 -0700 (PDT) Date: Sun, 30 Aug 2026 08:03:29 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a944641.4d659fcc.734b4.003b.GAE@google.com> Subject: [syzbot] [kernfs?] WARNING in generic_access_phys From: syzbot To: driver-core@lists.linux.dev, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, tj@kernel.org Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 45c13f3f9e3b Merge tag 'hwlock-v7.3' of git://git.kernel.o.. git tree: https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux master console output: https://syzkaller.appspot.com/x/log.txt?x=173c5d79580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d6a4e008e57a0e64 dashboard link: https://syzkaller.appspot.com/bug?extid=fafc2cbca26ad7368aae compiler: aarch64-linux-gnu-gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 userspace arch: arm syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11d7ac15580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17320349580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/fa3fbcfdac58/non_bootable_disk-45c13f3f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/f88d9fecef79/vmlinux-45c13f3f.xz kernel image: https://storage.googleapis.com/syzbot-assets/87ae79a5d86d/zImage-45c13f3f.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+fafc2cbca26ad7368aae@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: ./arch/arm64/include/asm/io.h:283 at rcu_read_unlock include/linux/rcupdate.h:878 [inline], CPU#0: syz.2.18/3678 WARNING: ./arch/arm64/include/asm/io.h:283 at pte_unmap include/linux/pgtable.h:117 [inline], CPU#0: syz.2.18/3678 WARNING: ./arch/arm64/include/asm/io.h:283 at follow_pfnmap_end mm/memory.c:7077 [inline], CPU#0: syz.2.18/3678 WARNING: ./arch/arm64/include/asm/io.h:283 at generic_access_phys+0x26c/0x344 mm/memory.c:7126, CPU#0: syz.2.18/3678 Modules linked in: CPU: 0 UID: 0 PID: 3678 Comm: syz.2.18 Tainted: G W syzkaller #0 PREEMPT Tainted: [W]=WARN Hardware name: linux,dummy-virt (DT) pstate: 20000005 (nzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : ioremap_prot arch/arm64/include/asm/io.h:283 [inline] pc : generic_access_phys+0x26c/0x344 mm/memory.c:7116 lr : rcu_read_unlock include/linux/rcupdate.h:882 [inline] lr : pte_unmap include/linux/pgtable.h:117 [inline] lr : follow_pfnmap_end mm/memory.c:7077 [inline] lr : generic_access_phys+0xcc/0x344 mm/memory.c:7111 sp : ffff8000a1d37830 x29: ffff8000a1d378f0 x28: ffff8000a1d37870 x27: 0000000000000000 x26: 0000000000000001 x25: ffff700010ef8fd0 x24: 0000000000001000 x23: ffff8000877c7e80 x22: 0000000000000000 x21: 0160000000000f92 x20: ffff000017a38a00 x19: 0000000010042000 x18: 0000000000000000 x17: ffff800080c267fc x16: ffff800080e49be0 x15: ffff800080e496d8 x14: ffff800080a8ead0 x13: ffff800089e66530 x12: ffff600003cfbfbd x11: 1fffe00003cfbfbc x10: ffff600003cfbfbc x9 : dfff800000000000 x8 : ffff00001e7dfde0 x7 : 0000000000000001 x6 : ffff600003cfbfbc x5 : ffff00001e7dfde0 x4 : 0000000000000000 x3 : 1fffe000025ac430 x2 : 0000000000000000 x1 : 0000000000001000 x0 : 000000003fffffff Call trace: rcu_read_unlock include/linux/rcupdate.h:878 [inline] (P) pte_unmap include/linux/pgtable.h:117 [inline] (P) follow_pfnmap_end mm/memory.c:7077 [inline] (P) generic_access_phys+0x26c/0x344 mm/memory.c:7126 (P) kernfs_vma_access+0x14c/0x1f0 fs/kernfs/file.c:437 __access_remote_vm+0x3dc/0x600 mm/memory.c:7194 access_remote_vm+0x10/0x20 mm/memory.c:7241 mem_rw+0x16c/0x580 fs/proc/base.c:912 mem_read+0x14/0x20 fs/proc/base.c:940 vfs_read+0x190/0xa18 fs/read_write.c:572 ksys_read+0xf0/0x1e0 fs/read_write.c:716 __do_sys_read fs/read_write.c:725 [inline] __se_sys_read fs/read_write.c:723 [inline] __arm64_sys_read+0x70/0xa0 fs/read_write.c:723 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x74/0x240 arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:121 do_el0_svc_compat+0x40/0x58 arch/arm64/kernel/syscall.c:146 el0_svc_compat+0x54/0x264 arch/arm64/kernel/entry-common.c:909 el0t_32_sync_handler+0x88/0xac arch/arm64/kernel/entry-common.c:927 el0t_32_sync+0x19c/0x1a0 arch/arm64/kernel/entry.S:595 irq event stamp: 2118 hardirqs last enabled at (2117): [] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:507 [inline] hardirqs last enabled at (2117): [] __arm64_exit_to_kernel_mode+0x38/0x98 arch/arm64/kernel/entry-common.c:60 hardirqs last disabled at (2118): [] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:445 softirqs last enabled at (2112): [] softirq_handle_end kernel/softirq.c:491 [inline] softirqs last enabled at (2112): [] handle_softirqs+0xa98/0x1048 kernel/softirq.c:673 softirqs last disabled at (2101): [] __do_softirq+0x14/0x20 kernel/softirq.c:679 ---[ end trace 0000000000000000 ]--- --- This report is generated by a bot. 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