syzbot has found a reproducer for the following issue on: HEAD commit: e49d033b Linux 5.12-rc6 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15f7cc6ad00000 kernel config: https://syzkaller.appspot.com/x/.config?x=f91155ccddaf919c dashboard link: https://syzkaller.appspot.com/bug?extid=f9131489729201445f66 compiler: Debian clang version 11.0.1-2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13dc5786d00000
IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+f9131489729201445...@syzkaller.appspotmail.com ================================================================================ UBSAN: shift-out-of-bounds in kernel/sched/fair.c:7712:14 shift exponent 77 is too large for 64-bit type 'unsigned long' CPU: 1 PID: 8407 Comm: syz-executor.4 Not tainted 5.12.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x176/0x24e lib/dump_stack.c:120 ubsan_epilogue lib/ubsan.c:148 [inline] __ubsan_handle_shift_out_of_bounds+0x42e/0x4d0 lib/ubsan.c:327 detach_tasks+0xd04/0x1110 kernel/sched/fair.c:7712 load_balance+0x39f6/0x5a80 kernel/sched/fair.c:9641 rebalance_domains+0x4ca/0x9c0 kernel/sched/fair.c:10029 __do_softirq+0x318/0x714 kernel/softirq.c:345 invoke_softirq kernel/softirq.c:221 [inline] __irq_exit_rcu+0x1d8/0x200 kernel/softirq.c:422 irq_exit_rcu+0x5/0x20 kernel/softirq.c:434 sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1100 </IRQ> asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:199 Code: b2 fd ff 66 90 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 0e 54 08 f8 48 89 df e8 56 29 0a f8 e8 f1 a4 2a f8 fb bf 01 00 00 00 <e8> 26 39 fe f7 65 8b 05 f7 7c ad 76 85 c0 74 02 5b c3 e8 ab d8 ab RSP: 0018:ffffc9000187fc70 EFLAGS: 00000282 RAX: eded0b76c3f98d00 RBX: ffff8880b9d34c80 RCX: ffffffff8ff89b03 RDX: 0000000040000000 RSI: 0000000000000002 RDI: 0000000000000001 RBP: ffffc9000187fcd0 R08: ffffffff817f17a0 R09: ffffed10173a6991 R10: ffffed10173a6991 R11: 0000000000000000 R12: ffff8880b9d34c80 R13: ffff88801caeb880 R14: dffffc0000000000 R15: 0000000000000000 finish_task_switch+0x145/0x620 kernel/sched/core.c:4191 context_switch kernel/sched/core.c:4325 [inline] __schedule+0x9a1/0xe70 kernel/sched/core.c:5073 schedule+0x14b/0x200 kernel/sched/core.c:5152 freezable_schedule include/linux/freezer.h:172 [inline] do_nanosleep+0x1cd/0x740 kernel/time/hrtimer.c:1896 hrtimer_nanosleep+0x1b9/0x3a0 kernel/time/hrtimer.c:1949 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1267 [inline] __se_sys_clock_nanosleep kernel/time/posix-timers.c:1245 [inline] __x64_sys_clock_nanosleep+0x2f6/0x340 kernel/time/posix-timers.c:1245 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x48a621 Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 aa e7 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 e3 e7 ff ff 48 8b 04 24 eb 97 66 2e 0f 1f RSP: 002b:00007ffd2ecab5c0 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6 RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 000000000048a621 RDX: 00007ffd2ecab600 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007ffd2ecab69c R08: 0000000000000000 R09: 0000000000000010 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000032 R13: 000000000006640a R14: 000000000000000d R15: 00007ffd2ecab700 ================================================================================
