Hello, syzbot found the following issue on:
HEAD commit: a74e6a01 Merge tag 's390-5.12-3' of git://git.kernel.org/p.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14f67ae6d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=c7ac5ce2d1160e16 dashboard link: https://syzkaller.appspot.com/bug?extid=a7ee43e564223f195c84 userspace arch: arm Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a7ee43e564223f195...@syzkaller.appspotmail.com BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.0/15841 caller is debug_smp_processor_id+0x20/0x24 lib/smp_processor_id.c:64 CPU: 0 PID: 15841 Comm: syz-executor.0 Not tainted 5.12.0-rc2-syzkaller #0 Hardware name: ARM-Versatile Express Backtrace: [<82107738>] (dump_backtrace) from [<821079ac>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:252) r7:00000000 r6:60000113 r5:00000000 r4:83966184 [<82107994>] (show_stack) from [<82110980>] (__dump_stack lib/dump_stack.c:79 [inline]) [<82107994>] (show_stack) from [<82110980>] (dump_stack+0xb8/0xe8 lib/dump_stack.c:120) [<821108c8>] (dump_stack) from [<82133120>] (check_preemption_disabled+0x118/0x11c lib/smp_processor_id.c:53) r7:8294d26c r6:00000000 r5:82133144 r4:86d725b0 [<82133008>] (check_preemption_disabled) from [<82133144>] (debug_smp_processor_id+0x20/0x24 lib/smp_processor_id.c:64) r7:00000a07 r6:86d72080 r5:0000000b r4:ffffc000 [<82133124>] (debug_smp_processor_id) from [<80217a00>] (harden_branch_predictor arch/arm/include/asm/system_misc.h:24 [inline]) [<82133124>] (debug_smp_processor_id) from [<80217a00>] (__do_user_fault+0x98/0x108 arch/arm/mm/fault.c:142) [<80217968>] (__do_user_fault) from [<80217c90>] (do_page_fault+0x190/0x378 arch/arm/mm/fault.c:357) r9:00000800 r8:84649ebc r7:84649e40 r6:00000a07 r5:ffffc000 r4:89063fb0 [<80217b00>] (do_page_fault) from [<80218054>] (do_DataAbort+0x38/0xb8 arch/arm/mm/fault.c:522) r10:7ef2f914 r9:76f276d0 r8:80217b00 r7:89063fb0 r6:ffffc000 r5:00000a07 r4:83837b38 [<8021801c>] (do_DataAbort) from [<80200dc4>] (__dabt_usr+0x44/0x60 arch/arm/kernel/entry-armv.S:421) Exception stack(0x89063fb0 to 0x89063ff8) 3fa0: ffffff00 20000280 ffffc000 20000250 3fc0: 00000004 20070517 00000140 20ffb000 7ef2f79a 76f276d0 7ef2f914 76f2720c 3fe0: 00000000 76f27020 00000006 00013b18 80000010 ffffffff r8:30c5387d r7:30c5387d r6:ffffffff r5:80000010 r4:00013b18 --- 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 syzkal...@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
