Hello, syzbot found the following crash on: HEAD commit: 9b1f2cbd Merge tag 'clk-fixes-for-linus' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15dfdeaa100000 kernel config: https://syzkaller.appspot.com/x/.config?x=c14212794ed9ad24 dashboard link: https://syzkaller.appspot.com/bug?extid=0e37e9d19bded16b8ab9 compiler: gcc (GCC) 9.0.0 20181231 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+0e37e9d19bded16b8ab9@xxxxxxxxxxxxxxxxxxxxxxxxx BUG: unable to handle page fault for address: ffff887ffffffff0 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 8682 Comm: syz-executor.3 Not tainted 5.7.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__rb_erase_augmented include/linux/rbtree_augmented.h:201 [inline] RIP: 0010:rb_erase+0x37/0x18d0 lib/rbtree.c:443 Code: 89 f7 41 56 41 55 49 89 fd 48 83 c7 08 48 89 fa 41 54 48 c1 ea 03 55 53 48 83 ec 18 80 3c 02 00 0f 85 89 10 00 00 49 8d 7d 10 <4d> 8b 75 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 RSP: 0018:ffffc900178ffb58 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff8880354d0000 RCX: ffffc9000fb6d000 RDX: 1ffff10ffffffffe RSI: ffff88800011dfe0 RDI: ffff887ffffffff8 RBP: ffff887fffffffb0 R08: ffff888057284280 R09: fffffbfff185d12e R10: ffffffff8c2e896f R11: fffffbfff185d12d R12: ffff88800011dfe0 R13: ffff887fffffffe8 R14: 000000000001dfe0 R15: ffff88800011dfe0 FS: 00007fa002d21700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff887ffffffff0 CR3: 00000000a2164000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: nfsd_reply_cache_free_locked+0x198/0x380 fs/nfsd/nfscache.c:127 nfsd_reply_cache_shutdown+0x150/0x350 fs/nfsd/nfscache.c:203 nfsd_exit_net+0x189/0x4c0 fs/nfsd/nfsctl.c:1504 ops_exit_list.isra.0+0xa8/0x150 net/core/net_namespace.c:186 setup_net+0x50c/0x860 net/core/net_namespace.c:364 copy_net_ns+0x293/0x590 net/core/net_namespace.c:482 create_new_namespaces+0x3fb/0xb30 kernel/nsproxy.c:108 unshare_nsproxy_namespaces+0xbd/0x1f0 kernel/nsproxy.c:229 ksys_unshare+0x43d/0x8e0 kernel/fork.c:2970 __do_sys_unshare kernel/fork.c:3038 [inline] __se_sys_unshare kernel/fork.c:3036 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3036 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca29 Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fa002d20c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 000000000050a1c0 RCX: 000000000045ca29 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000c4e R14: 00000000004ce9bd R15: 00007fa002d216d4 Modules linked in: CR2: ffff887ffffffff0 ---[ end trace f929dcba0362906a ]--- RIP: 0010:__rb_erase_augmented include/linux/rbtree_augmented.h:201 [inline] RIP: 0010:rb_erase+0x37/0x18d0 lib/rbtree.c:443 Code: 89 f7 41 56 41 55 49 89 fd 48 83 c7 08 48 89 fa 41 54 48 c1 ea 03 55 53 48 83 ec 18 80 3c 02 00 0f 85 89 10 00 00 49 8d 7d 10 <4d> 8b 75 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 RSP: 0018:ffffc900178ffb58 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff8880354d0000 RCX: ffffc9000fb6d000 RDX: 1ffff10ffffffffe RSI: ffff88800011dfe0 RDI: ffff887ffffffff8 RBP: ffff887fffffffb0 R08: ffff888057284280 R09: fffffbfff185d12e R10: ffffffff8c2e896f R11: fffffbfff185d12d R12: ffff88800011dfe0 R13: ffff887fffffffe8 R14: 000000000001dfe0 R15: ffff88800011dfe0 FS: 00007fa002d21700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff887ffffffff0 CR3: 00000000a2164000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- 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@xxxxxxxxxxxxxxxx. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
