Hello, syzbot found the following issue on: HEAD commit: 381f163531d8 Merge branch 'for-next/core' into for-kernelci git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=108175ac180000 kernel config: https://syzkaller.appspot.com/x/.config?x=2402d46ab3c7e581 dashboard link: https://syzkaller.appspot.com/bug?extid=02e64be5307d72e9c309 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1125fa6a180000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1211e332180000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/47402e75ee62/disk-381f1635.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a26a3a35fa67/vmlinux-381f1635.xz kernel image: https://storage.googleapis.com/syzbot-assets/d8dae1be1fa4/Image-381f1635.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+02e64be5307d72e9c309@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:96 [inline] BUG: KASAN: null-ptr-deref in atomic_long_add_return_acquire include/linux/atomic/atomic-instrumented.h:3269 [inline] BUG: KASAN: null-ptr-deref in rwsem_read_trylock kernel/locking/rwsem.c:243 [inline] BUG: KASAN: null-ptr-deref in __down_read_common kernel/locking/rwsem.c:1249 [inline] BUG: KASAN: null-ptr-deref in __down_read_killable kernel/locking/rwsem.c:1273 [inline] BUG: KASAN: null-ptr-deref in down_read_killable+0x78/0x338 kernel/locking/rwsem.c:1551 Write of size 8 at addr 0000000000000120 by task syz-executor185/6171 CPU: 0 PID: 6171 Comm: syz-executor185 Tainted: G B 6.8.0-rc6-syzkaller-g381f163531d8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:291 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:298 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 print_report+0xe4/0x518 mm/kasan/report.c:491 kasan_report+0xd8/0x138 mm/kasan/report.c:601 kasan_check_range+0x254/0x294 mm/kasan/generic.c:189 __kasan_check_write+0x20/0x30 mm/kasan/shadow.c:37 instrument_atomic_read_write include/linux/instrumented.h:96 [inline] atomic_long_add_return_acquire include/linux/atomic/atomic-instrumented.h:3269 [inline] rwsem_read_trylock kernel/locking/rwsem.c:243 [inline] __down_read_common kernel/locking/rwsem.c:1249 [inline] __down_read_killable kernel/locking/rwsem.c:1273 [inline] down_read_killable+0x78/0x338 kernel/locking/rwsem.c:1551 mmap_read_lock_killable include/linux/mmap_lock.h:155 [inline] do_pagemap_scan fs/proc/task_mmu.c:2460 [inline] do_pagemap_cmd+0x8d8/0x1240 fs/proc/task_mmu.c:2513 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl fs/ioctl.c:857 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:857 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 ================================================================== Unable to handle kernel NULL pointer dereference at virtual address 0000000000000120 Mem abort info: ESR = 0x0000000096000006 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: level 2 translation fault Data abort info: ISV = 0, ISS = 0x00000006, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 user pgtable: 4k pages, 48-bit VAs, pgdp=00000001129c0000 [0000000000000120] pgd=080000011d13d003, p4d=080000011d13d003, pud=080000011cfae003, pmd=0000000000000000 Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 6171 Comm: syz-executor185 Tainted: G B 6.8.0-rc6-syzkaller-g381f163531d8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __lse_atomic64_fetch_add_acquire arch/arm64/include/asm/atomic_lse.h:169 [inline] pc : __lse_atomic64_add_return_acquire arch/arm64/include/asm/atomic_lse.h:202 [inline] pc : arch_atomic64_add_return_acquire arch/arm64/include/asm/atomic.h:91 [inline] pc : raw_atomic64_add_return_acquire include/linux/atomic/atomic-arch-fallback.h:2703 [inline] pc : raw_atomic_long_add_return_acquire include/linux/atomic/atomic-long.h:163 [inline] pc : atomic_long_add_return_acquire include/linux/atomic/atomic-instrumented.h:3270 [inline] pc : rwsem_read_trylock kernel/locking/rwsem.c:243 [inline] pc : __down_read_common kernel/locking/rwsem.c:1249 [inline] pc : __down_read_killable kernel/locking/rwsem.c:1273 [inline] pc : down_read_killable+0x80/0x338 kernel/locking/rwsem.c:1551 lr : instrument_atomic_read_write include/linux/instrumented.h:96 [inline] lr : atomic_long_add_return_acquire include/linux/atomic/atomic-instrumented.h:3269 [inline] lr : rwsem_read_trylock kernel/locking/rwsem.c:243 [inline] lr : __down_read_common kernel/locking/rwsem.c:1249 [inline] lr : __down_read_killable kernel/locking/rwsem.c:1273 [inline] lr : down_read_killable+0x78/0x338 kernel/locking/rwsem.c:1551 sp : ffff8000978a79d0 x29: ffff8000978a79d0 x28: ffff8000978a7b40 x27: dfff800000000000 x26: 0000000000000000 x25: 0000000020ffd000 x24: ffff8000978a7b68 x23: ffff700012f14f68 x22: ffff0000d8fdda2c x21: 0000000000000120 x20: 0000000000000190 x19: ffff800080cef5fc x18: 0000000000000000 x17: 3d3d3d3d3d3d3d3d x16: ffff800080275eb0 x15: 0000000000000001 x14: 1ffff000123e3a9c x13: 0000000000000000 x12: 0000000000000000 x11: ffff7000123e3a9d x10: 0000000000ff0100 x9 : 0000000000000000 x8 : 0000000000000100 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff8000978a71d8 x4 : ffff80008ed81760 x3 : ffff8000801c0944 x2 : 0000000000000001 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: raw_atomic64_add_return_acquire include/linux/atomic/atomic-arch-fallback.h:2703 [inline] raw_atomic_long_add_return_acquire include/linux/atomic/atomic-long.h:163 [inline] atomic_long_add_return_acquire include/linux/atomic/atomic-instrumented.h:3270 [inline] rwsem_read_trylock kernel/locking/rwsem.c:243 [inline] __down_read_common kernel/locking/rwsem.c:1249 [inline] __down_read_killable kernel/locking/rwsem.c:1273 [inline] down_read_killable+0x80/0x338 kernel/locking/rwsem.c:1551 mmap_read_lock_killable include/linux/mmap_lock.h:155 [inline] do_pagemap_scan fs/proc/task_mmu.c:2460 [inline] do_pagemap_cmd+0x8d8/0x1240 fs/proc/task_mmu.c:2513 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl fs/ioctl.c:857 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:857 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 Code: 52800101 974346ca d503201f 52802008 (f8a802a8) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 52800101 mov w1, #0x8 // #8 4: 974346ca bl 0xfffffffffd0d1b2c 8: d503201f nop c: 52802008 mov w8, #0x100 // #256 * 10: f8a802a8 ldadda x8, x8, [x21] <-- trapping instruction --- 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 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
