tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.9.y head: 8da69d43f5d3f7f8787117ee78cfc4060c4c0d29 commit: 05700fe421866f60f63fbb3a02852425a9bd9447 [9976/9999] libceph: allow ceph_buffer_put() to receive a NULL ceph_buffer config: x86_64-randconfig-r021-20210725 (attached as .config) compiler: gcc-10 (Ubuntu 10.3.0-1ubuntu1~20.04) 10.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git/commit/?id=05700fe421866f60f63fbb3a02852425a9bd9447 git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git git fetch --no-tags linux-stable-rc linux-4.9.y git checkout 05700fe421866f60f63fbb3a02852425a9bd9447 # save the attached .config to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash LDFLAGS=-z max-page-size=0x200000 arch/x86/xen/ fs/ceph/ net/batman-adv/ net/ceph/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All warnings (new ones prefixed by >>): In file included from include/linux/ceph/ceph_fs.h:15, from include/linux/ceph/types.h:10, from include/linux/ceph/libceph.h:18, from fs/ceph/super.h:18, from fs/ceph/caps.c:11: include/linux/ceph/msgr.h:66:1: warning: alignment 1 of 'struct ceph_entity_addr' is less than 8 [-Wpacked-not-aligned] 66 | } __attribute__ ((packed)); | ^ fs/ceph/caps.c: In function '__send_cap': fs/ceph/caps.c:1128:22: warning: variable 'dropping' set but not used [-Wunused-but-set-variable] 1128 | int held, revoking, dropping, keep; | ^~~~~~~~ fs/ceph/caps.c: In function 'ceph_handle_caps': fs/ceph/caps.c:3571:7: warning: variable 'osd_epoch_barrier' set but not used [-Wunused-but-set-variable] 3571 | u32 osd_epoch_barrier; | ^~~~~~~~~~~~~~~~~ fs/ceph/caps.c:3570:19: warning: variable 'caller_gid' set but not used [-Wunused-but-set-variable] 3570 | u32 caller_uid, caller_gid; | ^~~~~~~~~~ fs/ceph/caps.c:3570:7: warning: variable 'caller_uid' set but not used [-Wunused-but-set-variable] 3570 | u32 caller_uid, caller_gid; | ^~~~~~~~~~ fs/ceph/caps.c:3569:7: warning: variable 'flush_tid' set but not used [-Wunused-but-set-variable] 3569 | u64 flush_tid; | ^~~~~~~~~ fs/ceph/caps.o: warning: objtool: handle_cap_flushsnap_ack.constprop.0() falls through to next function __ceph_flush_snaps.cold() >> fs/ceph/caps.o: warning: objtool: handle_cap_grant() falls through to next function ceph_add_cap.cold() -- In file included from include/linux/ceph/ceph_fs.h:15, from include/linux/ceph/types.h:10, from include/linux/ceph/libceph.h:18, from net/ceph/messenger.c:21: include/linux/ceph/msgr.h:66:1: warning: alignment 1 of 'struct ceph_entity_addr' is less than 8 [-Wpacked-not-aligned] 66 | } __attribute__ ((packed)); | ^ net/ceph/messenger.c: In function 'write_partial_message_data': net/ceph/messenger.c:1570:8: warning: variable 'need_crc' set but not used [-Wunused-but-set-variable] 1570 | bool need_crc; | ^~~~~~~~ In file included from include/linux/kernel.h:13, from include/linux/list.h:8, from include/linux/wait.h:6, from include/linux/fs.h:5, from include/linux/highmem.h:4, from net/ceph/messenger.c:5: net/ceph/messenger.c: In function 'ceph_sock_state_change': include/linux/printk.h:123:2: warning: this statement may fall through [-Wimplicit-fallthrough=] 123 | 0; \ | ^ include/linux/printk.h:315:2: note: in expansion of macro 'no_printk' 315 | no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) | ^~~~~~~~~ include/linux/ceph/ceph_debug.h:34:25: note: in expansion of macro 'pr_debug' 34 | # define dout(fmt, ...) pr_debug(" " fmt, ##__VA_ARGS__) | ^~~~~~~~ net/ceph/messenger.c:431:3: note: in expansion of macro 'dout' 431 | dout("%s TCP_CLOSE\n", __func__); | ^~~~ net/ceph/messenger.c:432:2: note: here 432 | case TCP_CLOSE_WAIT: | ^~~~ arch/x86/include/asm/bitops.h: Assembler messages: arch/x86/include/asm/bitops.h:206: Warning: no instruction mnemonic suffix given and no register operands; using default for `bts' arch/x86/include/asm/bitops.h:252: Warning: no instruction mnemonic suffix given and no register operands; using default for `btr' >> net/ceph/messenger.o: warning: objtool: ceph_msg_release() falls through to next function ceph_msg_new.cold() --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org