Hello, syzbot found the following issue on: HEAD commit: 60e72093 Merge tag 'clk-fixes-for-linus' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=169943a7900000 kernel config: https://syzkaller.appspot.com/x/.config?x=89ab6a0c48f30b49 dashboard link: https://syzkaller.appspot.com/bug?extid=e8b76e1215d7b7214060 compiler: gcc (GCC) 10.1.0-syz 20200507 userspace arch: i386 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+e8b76e1215d7b7214060@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ virt_to_cache: Object is not a Slab page! WARNING: CPU: 1 PID: 1161 at mm/slab.h:420 virt_to_cache mm/slab.h:420 [inline] WARNING: CPU: 1 PID: 1161 at mm/slab.h:420 kfree+0x29b/0x2b0 mm/slab.c:3752 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 1161 Comm: kworker/u4:9 Not tainted 5.9.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x198/0x1fd lib/dump_stack.c:118 panic+0x382/0x7fb kernel/panic.c:231 __warn.cold+0x20/0x4b kernel/panic.c:600 report_bug+0x1bd/0x210 lib/bug.c:198 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:234 exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:254 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536 RIP: 0010:virt_to_cache mm/slab.h:420 [inline] RIP: 0010:kfree+0x29b/0x2b0 mm/slab.c:3752 Code: 05 91 b6 9d 09 01 e8 29 bf a5 ff e9 7a ff ff ff 48 c7 c6 80 70 96 88 48 c7 c7 70 c9 b2 89 c6 05 25 db 9d 09 01 e8 67 dd 8f ff <0f> 0b e9 bf fe ff ff 0f 0b 66 90 66 2e 0f 1f 84 00 00 00 00 00 41 RSP: 0018:ffffc90016137b50 EFLAGS: 00010086 RAX: 0000000000000000 RBX: 0000000000000286 RCX: 0000000000000000 RDX: ffff888061194000 RSI: ffffffff815f59d5 RDI: fffff52002c26f5c RBP: ffff888000400000 R08: 0000000000000001 R09: ffff8880ae520f8b R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000200 R13: 000000000002bfa8 R14: ffff888000400000 R15: 0000000000000800 kvfree+0x42/0x50 mm/util.c:603 nfsd_reply_cache_shutdown+0x1a3/0x2c0 fs/nfsd/nfscache.c:214 nfsd_exit_net+0x15f/0x490 fs/nfsd/nfsctl.c:1507 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:186 cleanup_net+0x4ea/0xa00 net/core/net_namespace.c:603 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Kernel Offset: disabled Rebooting in 86400 seconds.. --- 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.
