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X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: +bhNERDtMP9JbJD8NOkfgEDRoby7RUjCyJsdY/qwlO19sJ55juUSln235i8PgIrhC4IzndyMrydSymBrJZn89Q== X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR11MB6524 X-OriginatorOrg: intel.com Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, kernel test robot noticed "BUG:kernel_NULL_pointer_dereference,address" on: commit: 2aa1f7a1f47ce8dac7593af605aaa859b3cf3bb1 ("connector/cn_proc: Add filtering to fix some bugs") https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master [test failed on linus/master 57d88e8a5974644039fbc47806bac7bb12025636] [test failed on linux-next/master dfa449a58323de195773cf928d99db4130702bf7] in testcase: stress-ng version: stress-ng-x86_64-0.15.04-1_20230912 with following parameters: nr_threads: 100% testtime: 60s sc_pid_max: 4194304 class: scheduler test: netlink-proc cpufreq_governor: performance compiler: gcc-12 test machine: 64 threads 2 sockets Intel(R) Xeon(R) Gold 6346 CPU @ 3.10GHz (Ice Lake) with 256G memory (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/202309201456.84c19e27-oliver.sang@intel.com [ 37.396174][ T4144] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 37.419771][ T4144] #PF: supervisor read access in kernel mode [ 37.425772][ T4144] #PF: error_code(0x0000) - not-present page [ 37.431771][ T4144] PGD 184255067 P4D 0 [ 37.435867][ T4144] Oops: 0000 [#1] SMP NOPTI [ 37.440388][ T4144] CPU: 45 PID: 4144 Comm: stress-ng Not tainted 6.5.0-rc2-00552-g2aa1f7a1f47c #1 [ 37.449509][ T4144] Hardware name: Inspur NF5180M6/NF5180M6, BIOS 06.00.04 04/12/2022 [ 37.457502][ T4144] RIP: 0010:cn_filter (drivers/connector/cn_proc.c:60) [ 37.462384][ T4144] Code: 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 0f 1f 44 00 00 48 85 ff 74 15 48 8b 87 78 02 00 00 <83> 38 02 0f 94 c0 0f b6 c0 c3 cc cc cc cc 31 c0 c3 cc cc cc cc 66 All code ======== 0: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 5: 90 nop 6: 90 nop 7: 90 nop 8: 90 nop 9: 90 nop a: 90 nop b: 90 nop c: 90 nop d: 90 nop e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: f3 0f 1e fa endbr64 19: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 1e: 48 85 ff test %rdi,%rdi 21: 74 15 je 0x38 23: 48 8b 87 78 02 00 00 mov 0x278(%rdi),%rax 2a:* 83 38 02 cmpl $0x2,(%rax) <-- trapping instruction 2d: 0f 94 c0 sete %al 30: 0f b6 c0 movzbl %al,%eax 33: c3 retq 34: cc int3 35: cc int3 36: cc int3 37: cc int3 38: 31 c0 xor %eax,%eax 3a: c3 retq 3b: cc int3 3c: cc int3 3d: cc int3 3e: cc int3 3f: 66 data16 Code starting with the faulting instruction =========================================== 0: 83 38 02 cmpl $0x2,(%rax) 3: 0f 94 c0 sete %al 6: 0f b6 c0 movzbl %al,%eax 9: c3 retq a: cc int3 b: cc int3 c: cc int3 d: cc int3 e: 31 c0 xor %eax,%eax 10: c3 retq 11: cc int3 12: cc int3 13: cc int3 14: cc int3 15: 66 data16 [ 37.482194][ T4144] RSP: 0018:ffa000002efcfc78 EFLAGS: 00010286 [ 37.488305][ T4144] RAX: 0000000000000000 RBX: ff1100014764c000 RCX: 0000000000000000 [ 37.496325][ T4144] RDX: 0000000000000000 RSI: ff110001005e4c00 RDI: ff1100014764c000 [ 37.504340][ T4144] RBP: ffa000002efcfcc0 R08: 0000000000000000 R09: ffffffff83b2cd80 [ 37.512358][ T4144] R10: ff110001005e4c00 R11: 0000000000000000 R12: ff110001005e4c00 [ 37.520375][ T4144] R13: ff1100014764c080 R14: ffffffff81971d50 R15: 0000000000000001 [ 37.528391][ T4144] FS: 00007f06a096e740(0000) GS:ff11002000140000(0000) knlGS:0000000000000000 [ 37.537365][ T4144] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.543997][ T4144] CR2: 0000000000000000 CR3: 0000000148042001 CR4: 0000000000771ee0 [ 37.552020][ T4144] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 37.560047][ T4144] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 37.568073][ T4144] PKRU: 55555554 [ 37.571676][ T4144] Call Trace: [ 37.575021][ T4144] [ 37.578016][ T4144] ? __die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434) [ 37.581966][ T4144] ? page_fault_oops (arch/x86/mm/fault.c:707) [ 37.586875][ T4144] ? exc_page_fault (arch/x86/include/asm/irqflags.h:37 arch/x86/include/asm/irqflags.h:72 arch/x86/mm/fault.c:1494 arch/x86/mm/fault.c:1542) [ 37.591689][ T4144] ? asm_exc_page_fault (arch/x86/include/asm/idtentry.h:570) [ 37.596765][ T4144] ? __pfx_cn_filter (drivers/connector/cn_proc.c:52) [ 37.601575][ T4144] ? cn_filter (drivers/connector/cn_proc.c:60) [ 37.605865][ T4144] ? kmalloc_reserve (net/core/skbuff.c:562) [ 37.610671][ T4144] do_one_broadcast (net/netlink/af_netlink.c:1496 (discriminator 1)) [ 37.615481][ T4144] netlink_broadcast_filtered (net/netlink/af_netlink.c:1555 (discriminator 11)) [ 37.621246][ T4144] ? __pfx_cn_filter (drivers/connector/cn_proc.c:52) [ 37.626053][ T4144] proc_fork_connector (drivers/connector/cn_proc.c:82) [ 37.631118][ T4144] copy_process (kernel/fork.c:2728) [ 37.635844][ T4144] kernel_clone (include/linux/random.h:26 kernel/fork.c:2913) [ 37.640301][ T4144] __do_sys_clone (kernel/fork.c:3056) [ 37.644848][ T4144] do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80) [ 37.649309][ T4144] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120) [ 37.655250][ T4144] RIP: 0033:0x7f06a0ad89fb [ 37.659713][ T4144] Code: ed 0f 85 f8 00 00 00 64 4c 8b 0c 25 10 00 00 00 45 31 c0 4d 8d 91 d0 02 00 00 31 d2 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 91 00 00 00 41 89 c5 85 c0 0f 85 9e 00 00 All code ======== 0: ed in (%dx),%eax 1: 0f 85 f8 00 00 00 jne 0xff 7: 64 4c 8b 0c 25 10 00 mov %fs:0x10,%r9 e: 00 00 10: 45 31 c0 xor %r8d,%r8d 13: 4d 8d 91 d0 02 00 00 lea 0x2d0(%r9),%r10 1a: 31 d2 xor %edx,%edx 1c: 31 f6 xor %esi,%esi 1e: bf 11 00 20 01 mov $0x1200011,%edi 23: b8 38 00 00 00 mov $0x38,%eax 28: 0f 05 syscall 2a:* 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax <-- trapping instruction 30: 0f 87 91 00 00 00 ja 0xc7 36: 41 89 c5 mov %eax,%r13d 39: 85 c0 test %eax,%eax 3b: 0f .byte 0xf 3c: 85 .byte 0x85 3d: 9e sahf ... Code starting with the faulting instruction =========================================== 0: 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax 6: 0f 87 91 00 00 00 ja 0x9d c: 41 89 c5 mov %eax,%r13d f: 85 c0 test %eax,%eax 11: 0f .byte 0xf 12: 85 .byte 0x85 13: 9e sahf The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20230920/202309201456.84c19e27-oliver.sang@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki