============================= WARNING: suspicious RCU usage 4.14.154 #0 Not tainted ----------------------------- include/linux/radix-tree.h:238 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 2 locks held by syz-executor.0/8006: #0: (&sb->s_type->i_mutex_key#12){+.+.}, at: [] inode_lock include/linux/fs.h:718 [inline] #0: (&sb->s_type->i_mutex_key#12){+.+.}, at: [] shmem_add_seals+0x15e/0x1060 mm/shmem.c:2810 #1: (&(&mapping->tree_lock)->rlock){-.-.}, at: [] spin_lock_irq include/linux/spinlock.h:342 [inline] #1: (&(&mapping->tree_lock)->rlock){-.-.}, at: [] shmem_tag_pins mm/shmem.c:2665 [inline] #1: (&(&mapping->tree_lock)->rlock){-.-.}, at: [] shmem_wait_for_pins mm/shmem.c:2706 [inline] #1: (&(&mapping->tree_lock)->rlock){-.-.}, at: [] shmem_add_seals+0x334/0x1060 mm/shmem.c:2822 stack backtrace: CPU: 0 PID: 8006 Comm: syz-executor.0 Not tainted 4.14.154 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x142/0x197 lib/dump_stack.c:58 lockdep_rcu_suspicious+0x153/0x15d kernel/locking/lockdep.c:4665 radix_tree_deref_slot include/linux/radix-tree.h:238 [inline] radix_tree_deref_slot include/linux/radix-tree.h:236 [inline] shmem_tag_pins mm/shmem.c:2667 [inline] shmem_wait_for_pins mm/shmem.c:2706 [inline] shmem_add_seals+0x9e0/0x1060 mm/shmem.c:2822 shmem_fcntl+0xf7/0x130 mm/shmem.c:2857 do_fcntl+0x190/0xe10 fs/fcntl.c:421 SYSC_fcntl fs/fcntl.c:463 [inline] SyS_fcntl+0xd5/0x110 fs/fcntl.c:448 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45a639 RSP: 002b:00007f6859ba5c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000048 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a639 RDX: 0000000000000008 RSI: 0000000000000409 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6859ba66d4 R13: 00000000004c1068 R14: 00000000004d3c60 R15: 00000000ffffffff overlayfs: filesystem on './file0' not supported as upperdir overlayfs: './file0' not a directory syz-executor.3 (8007) used greatest stack depth: 23536 bytes left hfs: can't find a HFS filesystem on dev loop5 audit: type=1400 audit(1574065292.727:71): avc: denied { module_load } for pid=8060 comm="syz-executor.3" path="/selinux/status" dev="selinuxfs" ino=19 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:security_t:s0 tclass=system permissive=1 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. audit: type=1400 audit(1574065293.647:72): avc: denied { ioctl } for pid=8065 comm="syz-executor.3" path="socket:[30898]" dev="sockfs" ino=30898 ioctlcmd=0x8991 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_netfilter_socket permissive=1 IPVS: ftp: loaded support on port[0] = 21 audit: type=1400 audit(1574065293.687:73): avc: denied { map } for pid=8087 comm="syz-executor.0" path=2F616E6F6E5F6875676570616765202864656C6574656429 dev="hugetlbfs" ino=30604 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:hugetlbfs_t:s0 tclass=file permissive=1 FAT-fs (loop1): bogus number of FAT structure FAT-fs (loop1): Can't find a valid FAT filesystem audit: type=1400 audit(1574065293.767:74): avc: denied { setopt } for pid=8094 comm="syz-executor.5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 audit: type=1800 audit(1574065294.357:75): pid=8140 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="collect_data" cause="failed(directio)" comm="syz-executor.1" name="bus" dev="sda1" ino=16666 res=0 block nbd1: Attempted send on invalid socket print_req_error: I/O error, dev nbd1, sector 64 block nbd1: Attempted send on invalid socket print_req_error: I/O error, dev nbd1, sector 120 IPVS: ftp: loaded support on port[0] = 21 loop_set_block_size: loop0 () has still dirty pages (nrpages=13) MINIX-fs: mounting file system with errors, running fsck is recommended minix_free_inode: bit 1 already cleared devpts: called with bogus options audit: type=1800 audit(1574065297.987:76): pid=8310 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="collect_data" cause="failed(directio)" comm="syz-executor.5" name="file0" dev="sda1" ino=16688 res=0 MINIX-fs: mounting file system with errors, running fsck is recommended minix_free_inode: bit 1 already cleared IPVS: ftp: loaded support on port[0] = 21 MINIX-fs: mounting file system with errors, running fsck is recommended minix_free_inode: bit 1 already cleared EXT4-fs (sda1): Unrecognized mount option "background_gc=on" or missing value MINIX-fs: mounting file system with errors, running fsck is recommended minix_free_inode: bit 1 already cleared EXT4-fs (sda1): re-mounted. Opts: MINIX-fs: mounting file system with errors, running fsck is recommended minix_free_inode: bit 1 already cleared bond0: Releasing backup interface bond_slave_1 bond0: Enslaving bond_slave_1 as an active interface with an up link *** Guest State *** CR0: actual=0x0000000000000030, shadow=0x0000000060000010, gh_mask=fffffffffffffff7 MINIX-fs: mounting file system with errors, running fsck is recommended CR4: actual=0x0000000000002050, shadow=0x0000000000000000, gh_mask=ffffffffffffe871 minix_free_inode: bit 1 already cleared CR3 = 0x00000000fffbc000 bond0: Error: Device is in use and cannot be enslaved bond0: Releasing backup interface bond_slave_1 RSP = 0x0000000000000000 RIP = 0x0000000000000000 RFLAGS=0xffffffffffffffff DR7 = 0x0000000000000400 Sysenter RSP=0000000000000000 CS:RIP=0000:0000000000000000 CS: sel=0xf000, attr=0x0009b, limit=0x0000ffff, base=0x00000000ffff0000 MINIX-fs: mounting file system with errors, running fsck is recommended DS: sel=0x0000, attr=0x00093, limit=0x0000ffff, base=0x0000000000000000 minix_free_inode: bit 1 already cleared SS: sel=0x0000, attr=0x00093, limit=0x0000ffff, base=0x0000000000000000 ES: sel=0x0000, attr=0x00093, limit=0x0000ffff, base=0x0000000000000000 FS: sel=0x0000, attr=0x00093, limit=0x0000ffff, base=0x0000000000000000 GS: sel=0x0000, attr=0x00093, limit=0x0000ffff, base=0x0000000000000000 GDTR: limit=0x0000ffff, base=0x0000000000000000 LDTR: sel=0x0000, attr=0x00082, limit=0x0000ffff, base=0x0000000000000000 MINIX-fs: mounting file system with errors, running fsck is recommended IPVS: length: 4096 != 8 selinux_nlmsg_perm: 71 callbacks suppressed SELinux: unrecognized netlink message: protocol=6 nlmsg_type=0 sclass=netlink_xfrm_socket pig=8498 comm=syz-executor.0 IDTR: limit=0x0000ffff, base=0x0000000000000000 minix_free_inode: bit 1 already cleared SELinux: unrecognized netlink message: protocol=6 nlmsg_type=0 sclass=netlink_xfrm_socket pig=8498 comm=syz-executor.0 TR: sel=0x0000, attr=0x0008b, limit=0x0000ffff, base=0x0000000000000000 EFER = 0x0000000000000000 PAT = 0x0007040600070406 DebugCtl = 0x0000000000000000 DebugExceptions = 0x0000000000000000 SELinux: unrecognized netlink message: protocol=6 nlmsg_type=0 sclass=netlink_xfrm_socket pig=8498 comm=syz-executor.0 Interruptibility = 00000000 ActivityState = 00000000 MINIX-fs: mounting file system with errors, running fsck is recommended SELinux: unrecognized netlink message: protocol=6 nlmsg_type=0 sclass=netlink_xfrm_socket pig=8498 comm=syz-executor.0 *** Host State *** MINIX-fs: mounting file system with errors, running fsck is recommended minix_free_inode: bit 1 already cleared RIP = 0xffffffff81179e30 RSP = 0xffff88804f17f998 SELinux: unrecognized netlink message: protocol=6 nlmsg_type=0 sclass=netlink_xfrm_socket pig=8498 comm=syz-executor.0 minix_free_inode: bit 1 already cleared IPVS: length: 4096 != 8 CS=0010 SS=0018 DS=0000 ES=0000 FS=0000 GS=0000 TR=0040 SELinux: unrecognized netlink message: protocol=6 nlmsg_type=0 sclass=netlink_xfrm_socket pig=8498 comm=syz-executor.0 FSBase=00007f390a3f1700 GSBase=ffff8880aee00000 TRBase=fffffe0000003000 SELinux: unrecognized netlink message: protocol=6 nlmsg_type=0 sclass=netlink_xfrm_socket pig=8498 comm=syz-executor.0 GDTBase=fffffe0000001000 IDTBase=fffffe0000000000 CR0=0000000080050033 CR3=00000000a9c3e000 CR4=00000000001426f0 Sysenter RSP=fffffe0000002200 CS:RIP=0010:ffffffff862018e0 EFER = 0x0000000000000d01 PAT = 0x0407050600070106 SELinux: unrecognized netlink message: protocol=6 nlmsg_type=0 sclass=netlink_xfrm_socket pig=8498 comm=syz-executor.0 *** Control State *** PinBased=0000003f CPUBased=b6a1edfa SecondaryExec=000000e3 SELinux: unrecognized netlink message: protocol=6 nlmsg_type=0 sclass=netlink_xfrm_socket pig=8498 comm=syz-executor.0 EntryControls=0000d1ff ExitControls=002fefff SELinux: unrecognized netlink message: protocol=6 nlmsg_type=0 sclass=netlink_xfrm_socket pig=8498 comm=syz-executor.0 ExceptionBitmap=00060042 PFECmask=00000000 PFECmatch=00000000 VMEntry: intr_info=80000004 errcode=00000000 ilen=00000000 VMExit: intr_info=00000000 errcode=00000000 ilen=00000000 reason=80000021 qualification=0000000000000000 IDTVectoring: info=00000000 errcode=00000000 TSC Offset = 0xffffff86ce125d76 TPR Threshold = 0x00 EPT pointer = 0x000000009e6a301e Virtual processor ID = 0x0001 MINIX-fs: mounting file system with errors, running fsck is recommended netlink: 24 bytes leftover after parsing attributes in process `syz-executor.2'. minix_free_inode: bit 1 already cleared MINIX-fs: mounting file system with errors, running fsck is recommended netlink: 24 bytes leftover after parsing attributes in process `syz-executor.2'. minix_free_inode: bit 1 already cleared IPVS: length: 4096 != 8 MINIX-fs: mounting file system with errors, running fsck is recommended minix_free_inode: bit 1 already cleared MINIX-fs: mounting file system with errors, running fsck is recommended minix_free_inode: bit 1 already cleared