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charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 8c2ffd91 Linux 5.1-rc2 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15099d2b200000 kernel config: https://syzkaller.appspot.com/x/.config?x=8dcdce25ea72bedf dashboard link: https://syzkaller.appspot.com/bug?extid=65cecdd27b726c261799 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17d3c67d200000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11d4f317200000 Bisection is inconclusive: the bug happens on the oldest tested release. bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=111a358b200000 console output: https://syzkaller.appspot.com/x/log.txt?x=151a358b200000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+65cecdd27b726c261799@syzkaller.appspotmail.com rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P8340 rcu: (detected by 1, t=10502 jiffies, g=5905, q=81) syz-executor586 R running task 27832 8340 8338 0x00000000 Call Trace: context_switch kernel/sched/core.c:2877 [inline] __schedule+0x817/0x1cc0 kernel/sched/core.c:3518 preempt_schedule_common+0x4f/0xe0 kernel/sched/core.c:3642 preempt_schedule+0x4b/0x60 kernel/sched/core.c:3668 ___preempt_schedule+0x16/0x18 __sched_setscheduler+0x12fb/0x1e70 kernel/sched/core.c:4398 sched_setattr kernel/sched/core.c:4440 [inline] __do_sys_sched_setattr kernel/sched/core.c:4616 [inline] __se_sys_sched_setattr kernel/sched/core.c:4595 [inline] __x64_sys_sched_setattr+0x184/0x2b0 kernel/sched/core.c:4595 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4403c9 Code: 76 77 78 5d 20 5b 2d 6c 3c 68 6f 73 74 6c 69 73 74 3e 5d 20 5b 2d 73 3c 64 6f 6d 61 69 6e 6c 69 73 74 3e 5d 0a 20 20 20 20 20 <20> 20 20 20 20 20 20 20 20 20 20 5b 2d 66 3c 63 6f 6e 66 66 69 6c RSP: 002b:00007ffea1a49298 EFLAGS: 00000246 ORIG_RAX: 000000000000013a RAX: ffffffffffffffda RBX: 00007ffea1a49340 RCX: 00000000004403c9 RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000002b80 R09: 0000000000400d10 R10: 000000000000f8f8 R11: 0000000000000246 R12: 0000000000401c90 R13: 0000000000401d20 R14: 0000000000000000 R15: 0000000000000000 syz-executor586 R running task 27832 8340 8338 0x00000000 Call Trace: context_switch kernel/sched/core.c:2877 [inline] __schedule+0x817/0x1cc0 kernel/sched/core.c:3518 preempt_schedule_common+0x4f/0xe0 kernel/sched/core.c:3642 preempt_schedule+0x4b/0x60 kernel/sched/core.c:3668 ___preempt_schedule+0x16/0x18 __sched_setscheduler+0x12fb/0x1e70 kernel/sched/core.c:4398 sched_setattr kernel/sched/core.c:4440 [inline] __do_sys_sched_setattr kernel/sched/core.c:4616 [inline] __se_sys_sched_setattr kernel/sched/core.c:4595 [inline] __x64_sys_sched_setattr+0x184/0x2b0 kernel/sched/core.c:4595 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4403c9 Code: 76 77 78 5d 20 5b 2d 6c 3c 68 6f 73 74 6c 69 73 74 3e 5d 20 5b 2d 73 3c 64 6f 6d 61 69 6e 6c 69 73 74 3e 5d 0a 20 20 20 20 20 <20> 20 20 20 20 20 20 20 20 20 20 5b 2d 66 3c 63 6f 6e 66 66 69 6c RSP: 002b:00007ffea1a49298 EFLAGS: 00000246 ORIG_RAX: 000000000000013a RAX: ffffffffffffffda RBX: 00007ffea1a49340 RCX: 00000000004403c9 RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000002b80 R09: 0000000000400d10 R10: 000000000000f8f8 R11: 0000000000000246 R12: 0000000000401c90 R13: 0000000000401d20 R14: 0000000000000000 R15: 0000000000000000 --- This bug 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@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches