[__je_sz_size2index_tab seems messed up in 2 of the asserting contexts: first 384 are zero in both. More before that is also messed up (all zero). I show the details later below.] On 2020-May-6, at 16:57, Mark Millard <marklmi at yahoo.com> wrote: > [This explores process crashes that happen during system > shutdown, in a context not having MALLOC_PRODUCTION= . > So assert failures are reported as the stopping points.] > > It looks like shutdown -p now, shutdown -r now, and the > like can lead some processes to assert during their exit > attempt, including a sshd failure (that I've not seen > before), rpcbind, and nfsd. I show information about the > observed asserts for those below. > > > sshd hit an assert, failing slab == extent_slab_get(extent) : > > (gdb) bt > #0 thr_kill () at thr_kill.S:4 > #1 0x50927170 in __raise (s=6) at /usr/src/lib/libc/gen/raise.c:52 > #2 0x50886cc0 in abort () at /usr/src/lib/libc/stdlib/abort.c:67 > #3 0x508834b0 in arena_dalloc (tsdn=<optimized out>, ptr=<optimized out>, tcache=<optimized out>, alloc_ctx=<optimized out>, slow_path=<optimized out>) > at /usr/src/contrib/jemalloc/include/jemalloc/internal/arena_inlines_b.h:315 > #4 idalloctm (tsdn=0x500dd040, ptr=0x5008a180, tcache=0x500dd160, alloc_ctx=<optimized out>, is_internal=<optimized out>, slow_path=<optimized out>) > at /usr/src/contrib/jemalloc/include/jemalloc/internal/jemalloc_internal_inlines_c.h:118 > #5 0x5087b0a4 in ifree (tsd=0x500dd040, ptr=0x5008a180, tcache=0x500dd160, slow_path=<optimized out>) at jemalloc_jemalloc.c:2590 > #6 0x5087acac in __je_free_default (ptr=0x5008a180) at jemalloc_jemalloc.c:2784 > #7 0x5087b294 in __free (ptr=0x5008a180) at jemalloc_jemalloc.c:2852 > #8 0x10029464 in server_accept_loop (config_s=<optimized out>, sock_in=<optimized out>, sock_out=<optimized out>, newsock=<optimized out>) at /usr/src/crypto/openssh/sshd.c:1185 > #9 main (ac=<optimized out>, av=0xffffde3c) at /usr/src/crypto/openssh/sshd.c:2009 > > . . . > (gdb) up > #2 0x50886cc0 in abort () at /usr/src/lib/libc/stdlib/abort.c:67 > 67 (void)raise(SIGABRT); > (gdb) up > #3 0x508834b0 in arena_dalloc (tsdn=<optimized out>, ptr=<optimized out>, tcache=<optimized out>, alloc_ctx=<optimized out>, slow_path=<optimized out>) > at /usr/src/contrib/jemalloc/include/jemalloc/internal/arena_inlines_b.h:315 > 315 assert(slab == extent_slab_get(extent)); > > (gdb) list > 310 rtree_ctx = tsd_rtree_ctx(tsdn_tsd(tsdn)); > 311 extent_t *extent = rtree_extent_read(tsdn, &extents_rtree, > 312 rtree_ctx, (uintptr_t)ptr, true); > 313 assert(szind == extent_szind_get(extent)); > 314 assert(szind < SC_NSIZES); > 315 assert(slab == extent_slab_get(extent)); > 316 } > 317 > 318 if (likely(slab)) { > 319 /* Small allocation. */ > > More fully: > > 285 JEMALLOC_ALWAYS_INLINE void > 286 arena_dalloc(tsdn_t *tsdn, void *ptr, tcache_t *tcache, > 287 alloc_ctx_t *alloc_ctx, bool slow_path) { > 288 assert(!tsdn_null(tsdn) || tcache == NULL); > 289 assert(ptr != NULL); > 290 > 291 if (unlikely(tcache == NULL)) { > 292 arena_dalloc_no_tcache(tsdn, ptr); > 293 return; > 294 } > 295 > 296 szind_t szind; > 297 bool slab; > 298 rtree_ctx_t *rtree_ctx; > 299 if (alloc_ctx != NULL) { > 300 szind = alloc_ctx->szind; > 301 slab = alloc_ctx->slab; > 302 assert(szind != SC_NSIZES); > 303 } else { > 304 rtree_ctx = tsd_rtree_ctx(tsdn_tsd(tsdn)); > 305 rtree_szind_slab_read(tsdn, &extents_rtree, rtree_ctx, > 306 (uintptr_t)ptr, true, &szind, &slab); > 307 } > 308 > 309 if (config_debug) { > 310 rtree_ctx = tsd_rtree_ctx(tsdn_tsd(tsdn)); > 311 extent_t *extent = rtree_extent_read(tsdn, &extents_rtree, > 312 rtree_ctx, (uintptr_t)ptr, true); > 313 assert(szind == extent_szind_get(extent)); > 314 assert(szind < SC_NSIZES); > 315 assert(slab == extent_slab_get(extent)); > 316 } > 317 > 318 if (likely(slab)) { > 319 /* Small allocation. */ > 320 tcache_dalloc_small(tsdn_tsd(tsdn), tcache, ptr, szind, > 321 slow_path); > 322 } else { > 323 arena_dalloc_large(tsdn, ptr, tcache, szind, slow_path); > 324 } > 325 } The following are only shown for contrast with the later cases of lots of zeros showing up where below shows non-zero values (taken from sshd.core, which failed differently): (gdb) x/4x __je_arenas+16368/4 0x50981ab0 <__je_arenas+16368>: 0x00000000 0x00000000 0x00000000 0x00000009 (gdb) print/x __je_arenas_lock $1 = {{{prof_data = {tot_wait_time = {ns = 0x0}, max_wait_time = {ns = 0x0}, n_wait_times = 0x0, n_spin_acquired = 0x0, max_n_thds = 0x0, n_waiting_thds = {repr = 0x0}, n_owner_switches = 0x0, prev_owner = 0x0, n_lock_ops = 0x0}, lock = 0x5008bf00, postponed_next = 0x50974070, locked = {repr = 0x0}}}, witness = {name = 0x50760b04, rank = 0x3, comp = 0x0, opaque = 0x0, link = { qre_next = 0x50981b10, qre_prev = 0x50981b10}}, lock_order = 0x0} (gdb) print/x __je_narenas_auto $2 = 0x8 (gdb) print/x malloc_conf $3 = 0x0 (gdb) print/x __je_ncpus $4 = 0x2 (gdb) print/x __je_manual_arena_base $5 = 0x9 (gdb) print/x __je_sz_pind2sz_tab $6 = {0x1000, 0x2000, 0x3000, 0x4000, 0x5000, 0x6000, 0x7000, 0x8000, 0xa000, 0xc000, 0xe000, 0x10000, 0x14000, 0x18000, 0x1c000, 0x20000, 0x28000, 0x30000, 0x38000, 0x40000, 0x50000, 0x60000, 0x70000, 0x80000, 0xa0000, 0xc0000, 0xe0000, 0x100000, 0x140000, 0x180000, 0x1c0000, 0x200000, 0x280000, 0x300000, 0x380000, 0x400000, 0x500000, 0x600000, 0x700000, 0x800000, 0xa00000, 0xc00000, 0xe00000, 0x1000000, 0x1400000, 0x1800000, 0x1c00000, 0x2000000, 0x2800000, 0x3000000, 0x3800000, 0x4000000, 0x5000000, 0x6000000, 0x7000000, 0x8000000, 0xa000000, 0xc000000, 0xe000000, 0x10000000, 0x14000000, 0x18000000, 0x1c000000, 0x20000000, 0x28000000, 0x30000000, 0x38000000, 0x40000000, 0x50000000, 0x60000000, 0x70000000, 0x70001000} (gdb) print/x __je_sz_index2size_tab $7 = {0x8, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70, 0x80, 0xa0, 0xc0, 0xe0, 0x100, 0x140, 0x180, 0x1c0, 0x200, 0x280, 0x300, 0x380, 0x400, 0x500, 0x600, 0x700, 0x800, 0xa00, 0xc00, 0xe00, 0x1000, 0x1400, 0x1800, 0x1c00, 0x2000, 0x2800, 0x3000, 0x3800, 0x4000, 0x5000, 0x6000, 0x7000, 0x8000, 0xa000, 0xc000, 0xe000, 0x10000, 0x14000, 0x18000, 0x1c000, 0x20000, 0x28000, 0x30000, 0x38000, 0x40000, 0x50000, 0x60000, 0x70000, 0x80000, 0xa0000, 0xc0000, 0xe0000, 0x100000, 0x140000, 0x180000, 0x1c0000, 0x200000, 0x280000, 0x300000, 0x380000, 0x400000, 0x500000, 0x600000, 0x700000, 0x800000, 0xa00000, 0xc00000, 0xe00000, 0x1000000, 0x1400000, 0x1800000, 0x1c00000, 0x2000000, 0x2800000, 0x3000000, 0x3800000, 0x4000000, 0x5000000, 0x6000000, 0x7000000, 0x8000000, 0xa000000, 0xc000000, 0xe000000, 0x10000000, 0x14000000, 0x18000000, 0x1c000000, 0x20000000, 0x28000000, 0x30000000, 0x38000000, 0x40000000, 0x50000000, 0x60000000, 0x70000000} (gdb) print/x __je_sz_size2index_tab $2 = {0x0, 0x0, 0x1, 0x2, 0x2, 0x3, 0x3, 0x4, 0x4, 0x5, 0x5, 0x6, 0x6, 0x7, 0x7, 0x8, 0x8, 0x9, 0x9, 0x9, 0x9, 0xa, 0xa, 0xa, 0xa, 0xb, 0xb, 0xb, 0xb, 0xc, 0xc, 0xc, 0xc, 0xd, 0xd, 0xd, 0xd, 0xd, 0xd, 0xd, 0xd, 0xe, 0xe, 0xe, 0xe, 0xe, 0xe, 0xe, 0xe, 0xf, 0xf, 0xf, 0xf, 0xf, 0xf, 0xf, 0xf, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x11 <repeats 16 times>, 0x12 <repeats 16 times>, 0x13 <repeats 16 times>, 0x14 <repeats 16 times>, 0x15 <repeats 32 times>, 0x16 <repeats 32 times>, 0x17 <repeats 32 times>, 0x18 <repeats 32 times>, 0x19 <repeats 64 times>, 0x1a <repeats 64 times>, 0x1b <repeats 64 times>, 0x1c <repeats 64 times>} > rpcbind hit an assert, failing ret == sz_size2index_compute(size) : > > (gdb) bt > #0 thr_kill () at thr_kill.S:4 > #1 0x502f2170 in __raise (s=6) at /usr/src/lib/libc/gen/raise.c:52 > #2 0x50251d04 in abort () at /usr/src/lib/libc/stdlib/abort.c:79 > #3 0x5024f260 in sz_size2index_lookup (size=<optimized out>) at /usr/src/contrib/jemalloc/include/jemalloc/internal/sz.h:159 > #4 sz_size2index (size=<optimized out>) at /usr/src/contrib/jemalloc/include/jemalloc/internal/sz.h:166 > #5 imalloc_body (sopts=0xffffb360, dopts=0xffffb340, tsd=0x5009a018) at jemalloc_jemalloc.c:2066 > #6 0x50244874 in imalloc (sopts=0xffffb360, dopts=0xffffb340) at /usr/src/contrib/jemalloc/include/jemalloc/internal/tsd.h:331 > #7 0x50244fe8 in __calloc (num=1, size=96) at jemalloc_jemalloc.c:2498 > #8 0x50265690 in svc_xprt_alloc () at /usr/src/lib/libc/rpc/svc.c:541 > #9 0x502635f4 in makefd_xprt (fd=14, sendsize=9000, recvsize=9000) at /usr/src/lib/libc/rpc/svc_vc.c:250 > #10 0x502644b4 in rendezvous_request (xprt=0x5004c000, msg=<optimized out>) at /usr/src/lib/libc/rpc/svc_vc.c:315 > #11 0x50265a98 in svc_getreq_common (fd=<optimized out>) at /usr/src/lib/libc/rpc/svc.c:640 > #12 0x50265d1c in svc_getreq_poll (pfdp=<optimized out>, pollretval=1) at /usr/src/lib/libc/rpc/svc.c:739 > #13 0x10018568 in my_svc_run () at /usr/src/usr.sbin/rpcbind/rpcb_svc_com.c:1167 > #14 0x10014ad8 in main (argc=<optimized out>, argv=<optimized out>) at /usr/src/usr.sbin/rpcbind/rpcbind.c:250 > (gdb) up 3 > #3 0x5024f260 in sz_size2index_lookup (size=<optimized out>) at /usr/src/contrib/jemalloc/include/jemalloc/internal/sz.h:159 > 159 assert(ret == sz_size2index_compute(size)); > (gdb) print ret > $1 = 0 > > 154 JEMALLOC_ALWAYS_INLINE szind_t > 155 sz_size2index_lookup(size_t size) { > 156 assert(size <= SC_LOOKUP_MAXCLASS); > 157 szind_t ret = (sz_size2index_tab[(size + (ZU(1) << SC_LG_TINY_MIN) - 1) > 158 >> SC_LG_TINY_MIN]); > 159 assert(ret == sz_size2index_compute(size)); > 160 return ret; > 161 } gdb reports for sz_size2index_tab (really JEMALLOC_N(sz_size2index_tab), i.e., __je_sz_size2index_tab): (gdb) print/x __je_sz_size2index_tab $1 = {0x0 <repeats 384 times>, 0x1a, 0x1b <repeats 64 times>, 0x1c <repeats 64 times>} Also: (gdb) x/4x __je_arenas+16368/4 0x5034cab0 <__je_arenas+16368>: 0x00000000 0x00000000 0x00000000 0x00000000 (gdb) print/x __je_arenas_lock $8 = {{{prof_data = {tot_wait_time = {ns = 0x0}, max_wait_time = {ns = 0x0}, n_wait_times = 0x0, n_spin_acquired = 0x0, max_n_thds = 0x0, n_waiting_thds = {repr = 0x0}, n_owner_switches = 0x0, prev_owner = 0x0, n_lock_ops = 0x0}, lock = 0x0, postponed_next = 0x0, locked = {repr = 0x0}}}, witness = {name = 0x0, rank = 0x0, comp = 0x0, opaque = 0x0, link = {qre_next = 0x0, qre_prev = 0x0}}, lock_order = 0x0} (gdb) print/x __je_narenas_auto $9 = 0x0 (gdb) print/x malloc_conf $10 = 0x0 (gdb) print/x __je_ncpus $11 = 0x0 (gdb) print/x __je_manual_arena_base $12 = 0x0 (gdb) print/x __je_sz_pind2sz_tab $13 = {0x0 <repeats 72 times>} (gdb) print/x __je_sz_index2size_tab $14 = {0x0 <repeats 104 times>} > nfsd hit an assert, failing ret == sz_size2index_compute(size) [Correction: That should have referenced sz_index2size_lookup(index).] > (also, but a different caller of sz_size2index): [Correction: The "also" comment should be ignored: sz_index2size_lookup(index) is referenced below.] > > (gdb) bt > #0 thr_kill () at thr_kill.S:4 > #1 0x502b2170 in __raise (s=6) at /usr/src/lib/libc/gen/raise.c:52 > #2 0x50211cc0 in abort () at /usr/src/lib/libc/stdlib/abort.c:67 > #3 0x50206104 in sz_index2size_lookup (index=<optimized out>) at /usr/src/contrib/jemalloc/include/jemalloc/internal/sz.h:200 > #4 sz_index2size (index=<optimized out>) at /usr/src/contrib/jemalloc/include/jemalloc/internal/sz.h:207 > #5 ifree (tsd=0x50094018, ptr=0x50041028, tcache=0x50094138, slow_path=<optimized out>) at jemalloc_jemalloc.c:2583 > #6 0x50205cac in __je_free_default (ptr=0x50041028) at jemalloc_jemalloc.c:2784 > #7 0x50206294 in __free (ptr=0x50041028) at jemalloc_jemalloc.c:2852 > #8 0x50287ec8 in ns_src_free (src=0x50329004, srclistsize=<optimized out>) at /usr/src/lib/libc/net/nsdispatch.c:452 > #9 ns_dbt_free (dbt=0x50329000) at /usr/src/lib/libc/net/nsdispatch.c:436 > #10 vector_free (vec=0x50329000, count=<optimized out>, esize=12, free_elem=<optimized out>) at /usr/src/lib/libc/net/nsdispatch.c:253 > #11 nss_atexit () at /usr/src/lib/libc/net/nsdispatch.c:578 > #12 0x5028d958 in __cxa_finalize (dso=0x0) at /usr/src/lib/libc/stdlib/atexit.c:240 > #13 0x502117f8 in exit (status=0) at /usr/src/lib/libc/stdlib/exit.c:74 > #14 0x10013f9c in child_cleanup (signo=<optimized out>) at /usr/src/usr.sbin/nfsd/nfsd.c:969 > #15 <signal handler called> > #16 0x00000000 in ?? () > > (gdb) up 3 > #3 0x50206104 in sz_index2size_lookup (index=<optimized out>) at /usr/src/contrib/jemalloc/include/jemalloc/internal/sz.h:200 > 200 assert(ret == sz_index2size_compute(index)); > > (ret is optimized out.) > > 197 JEMALLOC_ALWAYS_INLINE size_t > 198 sz_index2size_lookup(szind_t index) { > 199 size_t ret = (size_t)sz_index2size_tab[index]; > 200 assert(ret == sz_index2size_compute(index)); > 201 return ret; > 202 } (gdb) print/x __je_sz_index2size_tab $3 = {0x0 <repeats 104 times>} Also: (gdb) x/4x __je_arenas+16368/4 0x5030cab0 <__je_arenas+16368>: 0x00000000 0x00000000 0x00000000 0x00000000 (gdb) print/x __je_arenas_lock $8 = {{{prof_data = {tot_wait_time = {ns = 0x0}, max_wait_time = {ns = 0x0}, n_wait_times = 0x0, n_spin_acquired = 0x0, max_n_thds = 0x0, n_waiting_thds = {repr = 0x0}, n_owner_switches = 0x0, prev_owner = 0x0, n_lock_ops = 0x0}, lock = 0x0, postponed_next = 0x0, locked = {repr = 0x0}}}, witness = {name = 0x0, rank = 0x0, comp = 0x0, opaque = 0x0, link = {qre_next = 0x0, qre_prev = 0x0}}, lock_order = 0x0} (gdb) print/x __je_narenas_auto $9 = 0x0 (gdb) print/x malloc_conf $10 = 0x0 (gdb) print/x __je_ncpus $11 = 0x0 (gdb) print/x __je_manual_arena_base $12 = 0x0 (gdb) print/x __je_sz_pind2sz_tab $13 = {0x0 <repeats 72 times>} (gdb) print/x __je_sz_size2index_tab $1 = {0x0 <repeats 384 times>, 0x1a, 0x1b <repeats 64 times>, 0x1c <repeats 64 times>} > Booting and immediately trying something like: > > service nfsd stop > > did not lead to a failure. But may be after > a while it would and be less drastic than a > reboot or power down. More detail: So, for rpcbind and nfds at some point a large part of __je_sz_size2index_tab is being stomped on, as is all of __je_sz_index2size_tab and more. For rpcbind, the following area is zero but in a live process is not all-zero (I show the partially non-zero live-process context instead of the all-zero .core file content): 0x5034cab0 <__je_arenas+16368>: 0x00000000 0x00000000 0x00000000 0x00000009 0x5034cac0 <__je_arenas_lock>: 0x00000000 0x00000000 0x00000000 0x00000000 0x5034cad0 <__je_arenas_lock+16>: 0x00000000 0x00000000 0x00000000 0x00000000 0x5034cae0 <__je_arenas_lock+32>: 0x00000000 0x00000000 0x00000000 0x00000000 0x5034caf0 <__je_arenas_lock+48>: 0x00000000 0x00000000 0x00000000 0x00000000 0x5034cb00 <__je_arenas_lock+64>: 0x00000000 0x5033f070 0x00000000 0x00000000 0x5034cb10 <__je_arenas_lock+80>: 0x5012bb04 0x00000003 0x00000000 0x00000000 0x5034cb20 <__je_arenas_lock+96>: 0x5034cb10 0x5034cb10 0x00000000 0x00000000 Then the memory in the crash continues to be zero until: 0x5034d000 <__je_sz_size2index_tab+384>: 0x1a1b1b1b 0x1b1b1b1b 0x1b1b1b1b 0x1b1b1b1b Notice the interesting page boundary for where non-zero is first available again! Between __je_arenas_lock and __je_sz_size2index_tab are: 0x5034cb30 __je_narenas_auto 0x5034cb38 malloc_conf 0x5034cb3c __je_ncpus 0x5034cb40 __je_manual_arena_base 0x5034cb80 __je_sz_pind2sz_tab 0x5034ccc0 __je_sz_index2size_tab 0x5034ce80 __je_sz_size2index_tab For nfsd, it is similar (again showing the partially non-zero live process context instead of the all-zeros from the .core file): 0x5030cab0 <__je_arenas+16368>: 0x00000000 0x00000000 0x00000000 0x00000009 0x5030cac0 <__je_arenas_lock>: 0x00000000 0x00000000 0x00000000 0x00000000 0x5030cad0 <__je_arenas_lock+16>: 0x00000000 0x00000000 0x00000000 0x00000000 0x5030cae0 <__je_arenas_lock+32>: 0x00000000 0x00000000 0x00000000 0x00000000 0x5030caf0 <__je_arenas_lock+48>: 0x00000000 0x00000000 0x00000000 0x00000000 0x5030cb00 <__je_arenas_lock+64>: 0x00000000 0x502ff070 0x00000000 0x00000000 0x5030cb10 <__je_arenas_lock+80>: 0x500ebb04 0x00000003 0x00000000 0x00000000 0x5030cb20 <__je_arenas_lock+96>: 0x5030cb10 0x5030cb10 0x00000000 0x00000000 Then the memory in the crash continues to be zero until: 0x5030d000 <__je_sz_size2index_tab+384>: 0x1a1b1b1b 0x1b1b1b1b 0x1b1b1b1b 0x1b1b1b1b Notice the interesting page boundary for where non-zero is first available again! Between __je_arenas_lock and __je_sz_size2index_tab are: 0x5030cb30 __je_narenas_auto 0x5030cb38 malloc_conf 0x5030cb3c __je_ncpus 0x5030cb40 __je_manual_arena_base 0x5030cb80 __je_sz_pind2sz_tab 0x5030ccc0 __je_sz_index2size_tab 0x5030ce80 __je_sz_size2index_tab Note: because __je_arenas is normally mostly zero for these contexts, I can not tell where the memory trashing started, only where it replaced non-zero values with zeros. === Mark Millard marklmi at yahoo.com ( dsl-only.net went away in early 2018-Mar)Received on Thu May 07 2020 - 05:46:40 UTC
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