Hello, syzbot found the following issue on: HEAD commit: e1381380 Merge git://git.kernel.org/pub/scm/linux/kernel/g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11238fb2d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=460abe93fbc821a4 dashboard link: https://syzkaller.appspot.com/bug?extid=b6c93d85a3f77fca7f13 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+b6c93d85a3f77fca7f13@xxxxxxxxxxxxxxxxxxxxxxxxx watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.1:22367] Modules linked in: irq event stamp: 4562 hardirqs last enabled at (4561): [<ffff8000143e4dd8>] exit_to_kernel_mode+0x38/0x230 arch/arm64/kernel/entry-common.c:59 hardirqs last disabled at (4562): [<ffff8000143e54a0>] enter_el1_irq_or_nmi+0x10/0x20 arch/arm64/kernel/entry-common.c:101 softirqs last enabled at (4442): [<ffff8000100109e0>] _stext+0x9e0/0x1084 softirqs last disabled at (4203): [<ffff80001015a04c>] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (4203): [<ffff80001015a04c>] invoke_softirq kernel/softirq.c:228 [inline] softirqs last disabled at (4203): [<ffff80001015a04c>] __irq_exit_rcu+0x46c/0x510 kernel/softirq.c:422 CPU: 0 PID: 22367 Comm: syz-executor.1 Not tainted 5.12.0-rc4-syzkaller-00223-ge138138003eb #0 Hardware name: linux,dummy-virt (DT) pstate: 00000005 (nzcv daif -PAN -UAO -TCO BTYPE=--) pc : clear_page+0x14/0x28 arch/arm64/lib/clear_page.S:23 lr : clear_highpage include/linux/highmem.h:203 [inline] lr : kernel_init_free_pages+0x74/0x180 mm/page_alloc.c:1212 sp : ffff0000105e7630 x29: ffff0000105e7630 x28: fffffc0000180f00 x27: ffff00007fc13ec0 x26: ffff00000a7be378 x25: ffff6000014f7c6f x24: 00000000000014b8 x23: ffff00000a7bcec0 x22: fffffc0000180f40 x21: ffff8000154f3398 x20: dfff800000000000 x19: fffffc0000180f00 x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 1fffe000020bce90 x13: 0000000000000001 x12: ffff7f80000301e7 x11: 1fffff80000301e6 x10: ffff7f80000301e6 x9 : 0000000000000000 x8 : ffff600000c07a00 x7 : 0000000000000000 x6 : 000000000000003f x5 : 0000000000000040 x4 : 1ffff00002fa7950 x3 : 1fffe000014f79d9 x2 : 0000000000000004 x1 : 0000000000000040 x0 : ffff00000603cf40 Call trace: clear_page+0x14/0x28 arch/arm64/lib/clear_page.S:21 post_alloc_hook+0x130/0x1fc mm/page_alloc.c:2305 prep_new_page mm/page_alloc.c:2311 [inline] get_page_from_freelist+0x2024/0x2a40 mm/page_alloc.c:3951 __alloc_pages_nodemask+0x2a0/0x24dc mm/page_alloc.c:5001 alloc_pages_vma+0xb4/0x510 mm/mempolicy.c:2240 alloc_zeroed_user_highpage_movable include/linux/highmem.h:197 [inline] do_anonymous_page mm/memory.c:3548 [inline] handle_pte_fault mm/memory.c:4316 [inline] __handle_mm_fault+0xc88/0x21d4 mm/memory.c:4453 handle_mm_fault+0x1cc/0x4dc mm/memory.c:4551 __do_page_fault arch/arm64/mm/fault.c:507 [inline] do_page_fault+0x228/0x880 arch/arm64/mm/fault.c:591 do_translation_fault+0x1a4/0x210 arch/arm64/mm/fault.c:672 do_mem_abort+0x64/0x1c0 arch/arm64/mm/fault.c:805 el0_da+0x3c/0x50 arch/arm64/kernel/entry-common.c:308 el0_sync_compat_handler+0x114/0x140 arch/arm64/kernel/entry-common.c:506 el0_sync_compat+0x174/0x180 arch/arm64/kernel/entry.S:708 --- 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 syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
