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Hello, kernel test robot noticed "Oops:general_protection_fault,probably_for_non-canonical_address#:#[##]KASAN" on: commit: ab3482dc2af45fa97143131e0e03e73e18e8fffa ("rcutorture: Make srcu{,d}_torture_init() announce the SRCU type") https://github.com/paulmckrcu/linux dev.2025.10.30a in testcase: rcutorture version: with following parameters: runtime: 300s test: default torture_type: srcud config: x86_64-randconfig-101-20251101 compiler: clang-20 test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G (please refer to attached dmesg/kmsg for entire log/backtrace) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-lkp/202511041306.c42f7162-lkp@intel.com [ 85.244843][ T376] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] KASAN [ 85.245696][ T376] KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] [ 85.246346][ T376] CPU: 0 UID: 0 PID: 376 Comm: rcu_torture_fak Tainted: G T 6.17.0-rc1-00079-gab3482dc2af4 #1 PREEMPT(voluntary) 5c143d583914383a8f9ea9c18b817a947366c659 [ 85.247433][ T376] Tainted: [T]=RANDSTRUCT [ 85.247685][ T376] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 85.248336][ T376] RIP: 0010:call_srcu (kbuild/src/consumer/kernel/rcu/srcutiny.c:211 (discriminator 1792)) [ 85.248645][ T376] Code: 43 e8 c1 4d 13 00 4d 8d 7c 24 70 4c 89 f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 87 54 2d 00 4d 8b 27 4c 89 e0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 e7 e8 0f 55 2d 00 4d 89 34 24 4d 89 37 e8 All code ======== 0: 43 e8 c1 4d 13 00 rex.XB call 0x134dc7 6: 4d 8d 7c 24 70 lea 0x70(%r12),%r15 b: 4c 89 f8 mov %r15,%rax e: 48 c1 e8 03 shr $0x3,%rax 12: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) 16: 74 08 je 0x20 18: 4c 89 ff mov %r15,%rdi 1b: e8 87 54 2d 00 call 0x2d54a7 20: 4d 8b 27 mov (%r15),%r12 23: 4c 89 e0 mov %r12,%rax 26: 48 c1 e8 03 shr $0x3,%rax 2a:* 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 e7 mov %r12,%rdi 33: e8 0f 55 2d 00 call 0x2d5547 38: 4d 89 34 24 mov %r14,(%r12) 3c: 4d 89 37 mov %r14,(%r15) 3f: e8 .byte 0xe8 Code starting with the faulting instruction =========================================== 0: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) 4: 74 08 je 0xe 6: 4c 89 e7 mov %r12,%rdi 9: e8 0f 55 2d 00 call 0x2d551d e: 4d 89 34 24 mov %r14,(%r12) 12: 4d 89 37 mov %r14,(%r15) 15: e8 .byte 0xe8 [ 85.249962][ T376] RSP: 0000:ffff88813023fd28 EFLAGS: 00010046 [ 85.250399][ T376] RAX: 0000000000000000 RBX: dffffc0000000000 RCX: dffffc0000000000 [ 85.250914][ T376] RDX: ffffffff852cf470 RSI: ffffffff852d613b RDI: ffffffff852d5d8f [ 85.251426][ T376] RBP: ffff88813023fd68 R08: 0000000000000002 R09: 0000000000000000 [ 85.251888][ T376] R10: 00000000a56728a8 R11: 000000005e2747a1 R12: 0000000000000000 [ 85.252406][ T376] R13: 0000000000000246 R14: ffff88813023fd78 R15: ffffffffc0183310 [ 85.252874][ T376] FS: 0000000000000000(0000) GS:0000000000000000(0000) knlGS:0000000000000000 [ 85.253484][ T376] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 85.253976][ T376] CR2: 0000562ce1691468 CR3: 000000014ad8a000 CR4: 00000000000406b0 [ 85.254529][ T376] Call Trace: [ 85.254754][ T376] [ 85.254937][ T376] synchronize_srcu (kbuild/src/consumer/kernel/rcu/srcutiny.c:241) [ 85.255283][ T376] ? rcu_read_lock_any_held (kbuild/src/consumer/kernel/rcu/update.c:403) [ 85.255601][ T376] srcu_torture_synchronize_expedited (kbuild/src/consumer/kernel/rcu/rcutorture.c:889) rcutorture [ 85.256310][ T376] rcu_torture_fakewriter (kbuild/src/consumer/kernel/rcu/rcutorture.c:1903) rcutorture The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20251104/202511041306.c42f7162-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki