It looks to me the code paths below had recently been modified heavily by this patchset. If this is reproducible, it can be confirmed by reverting it. https://lore.kernel.org/linux-arm-kernel/cover.1605046662.git.andreyknvl@xxxxxxxxxx/ On Tue, 2020-11-10 at 23:45 -0800, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 3e14f70c Add linux-next specific files for 20201111 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=12e6af62500000 > kernel config: https://syzkaller.appspot.com/x/.config?x=d6f4c7e100b61b76 > dashboard link: https://syzkaller.appspot.com/bug?extid=2d6f3dad1a42d86a5801 > compiler: gcc (GCC) 10.1.0-syz 20200507 > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+2d6f3dad1a42d86a5801@xxxxxxxxxxxxxxxxxxxxxxxxx > > RPC: Registered named UNIX socket transport module. > RPC: Registered udp transport module. > RPC: Registered tcp transport module. > RPC: Registered tcp NFSv4.1 backchannel transport module. > NET: Registered protocol family 44 > pci_bus 0000:00: resource 4 [io 0x0000-0x0cf7 window] > pci_bus 0000:00: resource 5 [io 0x0d00-0xffff window] > pci_bus 0000:00: resource 6 [mem 0x000a0000-0x000bffff window] > pci_bus 0000:00: resource 7 [mem 0xc0000000-0xfebfefff window] > pci 0000:00:00.0: Limiting direct PCI/PCI transfers > PCI: CLS 0 bytes, default 64 > PCI-DMA: Using software bounce buffering for IO (SWIOTLB) > software IO TLB: mapped [mem 0x00000000b5e00000-0x00000000b9e00000] (64MB) > RAPL PMU: API unit is 2^-32 Joules, 0 fixed counters, 10737418240 ms ovfl > timer > kvm: already loaded the other module > clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x212735223b2, > max_idle_ns: 440795277976 ns > clocksource: Switched to clocksource tsc > Initialise system trusted keyrings > workingset: timestamp_bits=40 max_order=21 bucket_order=0 > zbud: loaded > DLM installed > squashfs: version 4.0 (2009/01/31) Phillip Lougher > FS-Cache: Netfs 'nfs' registered for caching > NFS: Registering the id_resolver key type > Key type id_resolver registered > Key type id_legacy registered > nfs4filelayout_init: NFSv4 File Layout Driver Registering... > Installing knfsd (copyright (C) 1996 okir@xxxxxxxxxxxx). > FS-Cache: Netfs 'cifs' registered for caching > Key type cifs.spnego registered > Key type cifs.idmap registered > ntfs: driver 2.1.32 [Flags: R/W]. > efs: 1.0a - http://aeschi.ch.eu.org/efs/ > jffs2: version 2.2. (NAND) (SUMMARY) © 2001-2006 Red Hat, Inc. > romfs: ROMFS MTD (C) 2007 Red Hat, Inc. > QNX4 filesystem 0.2.3 registered. > qnx6: QNX6 filesystem 1.0.0 registered. > fuse: init (API version 7.32) > orangefs_debugfs_init: called with debug mask: :none: :0: > orangefs_init: module version upstream loaded > JFS: nTxBlock = 8192, nTxLock = 65536 > SGI XFS with ACLs, security attributes, realtime, quota, no debug enabled > 9p: Installing v9fs 9p2000 file system support > FS-Cache: Netfs '9p' registered for caching > NILFS version 2 loaded > befs: version: 0.9.3 > ocfs2: Registered cluster interface o2cb > ocfs2: Registered cluster interface user > OCFS2 User DLM kernel interface loaded > gfs2: GFS2 installed > BUG: kernel NULL pointer dereference, address: 0000000000000018 > #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: 0 PID: 1 Comm: swapper/0 Not tainted 5.10.0-rc3-next-20201111-syzkaller > #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google > 01/01/2011 > RIP: 0010:nearest_obj include/linux/slub_def.h:169 [inline] > RIP: 0010:____kasan_slab_free+0x19/0x110 mm/kasan/common.c:350 > Code: 00 48 c7 c0 fb ff ff ff c3 cc cc cc cc cc cc cc cc 41 55 49 89 d5 41 54 > 49 89 fc 48 89 f7 55 48 89 f5 53 89 cb e8 f7 27 7e ff <41> 8b 7c 24 18 48 be > 00 00 00 00 00 16 00 00 48 c1 e8 0c 48 89 c1 > RSP: 0000:ffffc90000c67d30 EFLAGS: 00010293 > RAX: 00000001436d0000 RBX: 0000000000000000 RCX: ffffffff8130a760 > RDX: ffff888140748000 RSI: ffffffff8130a76a RDI: 0000000000000007 > RBP: ffff8881436d0000 R08: 00000000000000fe R09: ffffed10286da800 > R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 > R13: ffffffff81945766 R14: ffff888143557944 R15: ffffffff81943b80 > FS: 0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000000000018 CR3: 000000000b08e000 CR4: 00000000001506f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > kasan_slab_free_mempool include/linux/kasan.h:202 [inline] > kasan_poison_element mm/mempool.c:107 [inline] > add_element mm/mempool.c:124 [inline] > mempool_init_node+0x37e/0x580 mm/mempool.c:205 > mempool_create_node mm/mempool.c:269 [inline] > mempool_create+0x76/0xc0 mm/mempool.c:254 > mempool_create_kmalloc_pool include/linux/mempool.h:88 [inline] > init_caches fs/ceph/super.c:785 [inline] > init_ceph+0x193/0x2d7 fs/ceph/super.c:1261 > do_one_initcall+0x103/0x650 init/main.c:1212 > do_initcall_level init/main.c:1285 [inline] > do_initcalls init/main.c:1301 [inline] > do_basic_setup init/main.c:1321 [inline] > kernel_init_freeable+0x600/0x684 init/main.c:1521 > kernel_init+0xd/0x1b8 init/main.c:1410 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 > Modules linked in: > CR2: 0000000000000018 > ---[ end trace d7568b3491dd0938 ]--- > RIP: 0010:nearest_obj include/linux/slub_def.h:169 [inline] > RIP: 0010:____kasan_slab_free+0x19/0x110 mm/kasan/common.c:350 > Code: 00 48 c7 c0 fb ff ff ff c3 cc cc cc cc cc cc cc cc 41 55 49 89 d5 41 54 > 49 89 fc 48 89 f7 55 48 89 f5 53 89 cb e8 f7 27 7e ff <41> 8b 7c 24 18 48 be > 00 00 00 00 00 16 00 00 48 c1 e8 0c 48 89 c1 > RSP: 0000:ffffc90000c67d30 EFLAGS: 00010293 > RAX: 00000001436d0000 RBX: 0000000000000000 RCX: ffffffff8130a760 > RDX: ffff888140748000 RSI: ffffffff8130a76a RDI: 0000000000000007 > RBP: ffff8881436d0000 R08: 00000000000000fe R09: ffffed10286da800 > R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 > R13: ffffffff81945766 R14: ffff888143557944 R15: ffffffff81943b80 > FS: 0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000000000018 CR3: 000000000b08e000 CR4: 00000000001506f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > > --- > 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.
