(adding Vlastimil) On Mon, Aug 14, 2023 at 04:04:59AM -0700, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 3feecb1b8483 Merge tag 'char-misc-6.5-rc6' of git://git.ke.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=137dddaba80000 > kernel config: https://syzkaller.appspot.com/x/.config?x=d84c6cf3c2bbdb4d > dashboard link: https://syzkaller.appspot.com/bug?extid=2f508e913916096bf53a > compiler: aarch64-linux-gnu-gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 > userspace arch: arm64 > > Downloadable assets: > disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/384ffdcca292/non_bootable_disk-3feecb1b.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/066a563f6f65/vmlinux-3feecb1b.xz > kernel image: https://storage.googleapis.com/syzbot-assets/eb9963107316/Image-3feecb1b.gz.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+2f508e913916096bf53a@xxxxxxxxxxxxxxxxxxxxxxxxx > > Booting Linux on physical CPU 0x0000000000 [0x000f0510] > Linux version 6.5.0-rc5-syzkaller-00349-g3feecb1b8483 (syzkaller@syzkaller) (aarch64-linux-gnu-gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40) #0 SMP PREEMPT now > random: crng init done > Machine model: linux,dummy-virt > efi: UEFI not found. > NUMA: No NUMA configuration found > NUMA: Faking a node at [mem 0x0000000040000000-0x00000000bfffffff] > NUMA: NODE_DATA [mem 0xbf9f6000-0xbf9f8fff] > Zone ranges: > DMA [mem 0x0000000040000000-0x00000000bfffffff] > DMA32 empty > Normal empty > Device empty > Movable zone start for each node > Early memory node ranges > node 0: [mem 0x0000000040000000-0x00000000bfffffff] > Initmem setup node 0 [mem 0x0000000040000000-0x00000000bfffffff] > cma: Reserved 32 MiB at 0x00000000bb800000 > psci: probing for conduit method from DT. > psci: PSCIv1.1 detected in firmware. > psci: Using standard PSCI v0.2 function IDs > psci: Trusted OS migration not required > psci: SMC Calling Convention v1.0 > percpu: Embedded 22 pages/cpu s51016 r8192 d30904 u90112 > Detected PIPT I-cache on CPU0 > CPU features: detected: Address authentication (architected QARMA5 algorithm) > CPU features: detected: HCRX_EL2 register > CPU features: detected: Virtualization Host Extensions > CPU features: detected: Hardware dirty bit management > CPU features: detected: Memory Tagging Extension > CPU features: detected: Asymmetric MTE Tag Check Fault > CPU features: detected: Spectre-v4 > MTE: enabled in synchronous mode at EL1 > alternatives: applying boot alternatives > kasan: KernelAddressSanitizer initialized (hw-tags, mode=sync, vmalloc=on, stacktrace=on) > Kernel command line: root=/dev/vda console=ttyAMA0 > Dentry cache hash table entries: 262144 (order: 9, 2097152 bytes, linear) > Inode-cache hash table entries: 131072 (order: 8, 1048576 bytes, linear) > Fallback order for Node 0: 0 > Built 1 zonelists, mobility grouping on. Total pages: 516096 > Policy zone: DMA > mem auto-init: stack:all(zero), heap alloc:on, heap free:off > stackdepot: allocating hash table via alloc_large_system_hash > stackdepot hash table entries: 1048576 (order: 11, 8388608 bytes, linear) > software IO TLB: area num 2. > software IO TLB: mapped [mem 0x00000000b6d00000-0x00000000bad00000] (64MB) > Memory: 1904996K/2097152K available (25152K kernel code, 2446K rwdata, 10084K rodata, 1280K init, 1475K bss, 159388K reserved, 32768K cma-reserved) > ================================================================== > BUG: KASAN: slab-out-of-bounds in __kasan_slab_alloc+0x7c/0xcc mm/kasan/common.c:331 > Read at addr fcff000002c01008 by task swapper/0 > Pointer tag: [fc], memory tag: [fd] > > CPU: 0 PID: 0 Comm: swapper Not tainted 6.5.0-rc5-syzkaller-00349-g3feecb1b8483 #0 > Hardware name: linux,dummy-virt (DT) > Call trace: > dump_backtrace+0x94/0xec arch/arm64/kernel/stacktrace.c:233 > show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:240 > __dump_stack lib/dump_stack.c:88 [inline] > dump_stack_lvl+0x48/0x60 lib/dump_stack.c:106 > print_address_description mm/kasan/report.c:364 [inline] > print_report+0x108/0x618 mm/kasan/report.c:475 > kasan_report+0x88/0xac mm/kasan/report.c:588 > report_tag_fault arch/arm64/mm/fault.c:334 [inline] > do_tag_recovery arch/arm64/mm/fault.c:346 [inline] > __do_kernel_fault+0x180/0x1ec arch/arm64/mm/fault.c:393 > do_bad_area arch/arm64/mm/fault.c:493 [inline] > do_tag_check_fault+0x78/0x8c arch/arm64/mm/fault.c:771 > do_mem_abort+0x44/0x94 arch/arm64/mm/fault.c:847 > el1_abort+0x40/0x60 arch/arm64/kernel/entry-common.c:369 > el1h_64_sync_handler+0xd8/0xe4 arch/arm64/kernel/entry-common.c:429 > el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:586 > __kasan_slab_alloc+0x7c/0xcc mm/kasan/common.c:331 > kasan_slab_alloc include/linux/kasan.h:186 [inline] > slab_post_alloc_hook mm/slab.h:762 [inline] > slab_alloc_node mm/slub.c:3470 [inline] > slab_alloc mm/slub.c:3478 [inline] > __kmem_cache_alloc_lru mm/slub.c:3485 [inline] > kmem_cache_alloc+0x144/0x290 mm/slub.c:3494 > kmem_cache_zalloc include/linux/slab.h:693 [inline] > bootstrap+0x2c/0x174 mm/slub.c:4988 > kmem_cache_init+0x144/0x1c8 mm/slub.c:5051 > mm_core_init+0x23c/0x2d0 mm/mm_init.c:2787 > start_kernel+0x220/0x5fc init/main.c:928 > __primary_switched+0xb4/0xbc arch/arm64/kernel/head.S:523 > > Allocated by task 0: > kasan_save_stack+0x3c/0x64 mm/kasan/common.c:45 > save_stack_info+0x38/0x118 mm/kasan/tags.c:104 > kasan_save_alloc_info+0x14/0x20 mm/kasan/tags.c:138 > __kasan_slab_alloc+0x94/0xcc mm/kasan/common.c:328 > kasan_slab_alloc include/linux/kasan.h:186 [inline] > slab_post_alloc_hook mm/slab.h:762 [inline] > slab_alloc_node mm/slub.c:3470 [inline] > slab_alloc mm/slub.c:3478 [inline] > __kmem_cache_alloc_lru mm/slub.c:3485 [inline] > kmem_cache_alloc+0x144/0x290 mm/slub.c:3494 > kmem_cache_zalloc include/linux/slab.h:693 [inline] > bootstrap+0x2c/0x174 mm/slub.c:4988 > kmem_cache_init+0x134/0x1c8 mm/slub.c:5050 > mm_core_init+0x23c/0x2d0 mm/mm_init.c:2787 > start_kernel+0x220/0x5fc init/main.c:928 > __primary_switched+0xb4/0xbc arch/arm64/kernel/head.S:523 > > The buggy address belongs to the object at ffff000002c01000 > which belongs to the cache kmem_cache of size 208 > The buggy address is located 8 bytes inside of > 208-byte region [ffff000002c01000, ffff000002c010d0) > > The buggy address belongs to the physical page: > page:(____ptrval____) refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x42c01 > flags: 0x1ffc00000000200(slab|node=0|zone=0|lastcpupid=0x7ff|kasantag=0x0) > page_type: 0xffffffff() > raw: 01ffc00000000200 fcff000002c01000 dead000000000100 dead000000000122 > raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 > page dumped because: kasan: bad access detected > > Memory state around the buggy address: > ffff000002c00e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ffff000002c00f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > >ffff000002c01000: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd > ^ > ffff000002c01100: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd > ffff000002c01200: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd > ================================================================== > SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1 > rcu: Preemptible hierarchical RCU implementation. > rcu: RCU restricting CPUs from NR_CPUS=8 to nr_cpu_ids=2. > Trampoline variant of Tasks RCU enabled. > Tracing variant of Tasks RCU enabled. > rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies. > rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=2 > NR_IRQS: 64, nr_irqs: 64, preallocated irqs: 0 > Root IRQ handler: gic_handle_irq > GIC: Using split EOI/Deactivate mode > GICv2m: range[mem 0x08020000-0x08020fff], SPI[80:143] > rcu: srcu_init: Setting srcu_struct sizes based on contention. > arch_timer: cp15 timer(s) running at 62.50MHz (phys). > clocksource: arch_sys_counter: mask: 0x1ffffffffffffff max_cycles: 0x1cd42e208c, max_idle_ns: 881590405314 ns > sched_clock: 57 bits at 63MHz, resolution 16ns, wraps every 4398046511096ns > kfence: initialized - using 2097152 bytes for 255 objects at 0x(____ptrval____)-0x(____ptrval____) > Console: colour dummy device 80x25 > Calibrating delay loop (skipped), value calculated using timer frequency.. 125.00 BogoMIPS (lpj=625000) > pid_max: default: 32768 minimum: 301 > LSM: initializing lsm=lockdown,capability,landlock,yama,safesetid,tomoyo,smack,integrity > landlock: Up and running. > Yama: becoming mindful. > TOMOYO Linux initialized > Smack: Initializing. > Smack: Netfilter enabled. > Smack: IPv6 Netfilter enabled. > Mount-cache hash table entries: 4096 (order: 3, 32768 bytes, linear) > Mountpoint-cache hash table entries: 4096 (order: 3, 32768 bytes, linear) > Detected PIPT I-cache on CPU1 > CPU1: Booted secondary processor 0x0000000001 [0x000f0510] > > > --- > 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@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > > If the bug is already fixed, let syzbot know by replying with: > #syz fix: exact-commit-title > > If you want to change bug's subsystems, reply with: > #syz set subsystems: new-subsystem > (See the list of subsystem names on the web dashboard) > > If the bug is a duplicate of another bug, reply with: > #syz dup: exact-subject-of-another-report > > If you want to undo deduplication, reply with: > #syz undup -- Sincerely yours, Mike.
