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Howlett" References: <20251010151116.GA436967@pauld.westford.csb> From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; keydata= xsFNBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 9oe9IF/R28zmh0ifLXyJQQz5ofdj4bPf8ecEW0rhcqHfTD8k4yK0xxt3xW+6Exqp9n9bydiy tcSAw/TahjW6yrA+6JhSBv1v2tIm+itQc073zjSX8OFL51qQVzRFr7H2UQG33lw2QrvHRXqD Ot7ViKam7v0Ho9wEWiQOOZlHItOOXFphWb2yq3nzrKe45oWoSgkxKb97MVsQ+q2SYjJRBBH4 8qKhphADYxkIP6yut/eaj9ImvRUZZRi0DTc8xfnvHGTjKbJzC2xpFcY0DQbZzuwsIZ8OPJCc LM4S7mT25NE5kUTG/TKQCk922vRdGVMoLA7dIQrgXnRXtyT61sg8PG4wcfOnuWf8577aXP1x 6mzw3/jh3F+oSBHb/GcLC7mvWreJifUL2gEdssGfXhGWBo6zLS3qhgtwjay0Jl+kza1lo+Cv BB2T79D4WGdDuVa4eOrQ02TxqGN7G0Biz5ZLRSFzQSQwLn8fbwARAQABzSBWbGFzdGltaWwg QmFia2EgPHZiYWJrYUBzdXNlLmN6PsLBlAQTAQoAPgIbAwULCQgHAwUVCgkICwUWAgMBAAIe AQIXgBYhBKlA1DSZLC6OmRA9UCJPp+fMgqZkBQJnyBr8BQka0IFQAAoJECJPp+fMgqZkqmMQ AIbGN95ptUMUvo6aAdhxaOCHXp1DfIBuIOK/zpx8ylY4pOwu3GRe4dQ8u4XS9gaZ96Gj4bC+ jwWcSmn+TjtKW3rH1dRKopvC07tSJIGGVyw7ieV/5cbFffA8NL0ILowzVg8w1ipnz1VTkWDr 2zcfslxJsJ6vhXw5/npcY0ldeC1E8f6UUoa4eyoskd70vO0wOAoGd02ZkJoox3F5ODM0kjHu Y97VLOa3GG66lh+ZEelVZEujHfKceCw9G3PMvEzyLFbXvSOigZQMdKzQ8D/OChwqig8wFBmV QCPS4yDdmZP3oeDHRjJ9jvMUKoYODiNKsl2F+xXwyRM2qoKRqFlhCn4usVd1+wmv9iLV8nPs 2Db1ZIa49fJet3Sk3PN4bV1rAPuWvtbuTBN39Q/6MgkLTYHb84HyFKw14Rqe5YorrBLbF3rl M51Dpf6Egu1yTJDHCTEwePWug4XI11FT8lK0LNnHNpbhTCYRjX73iWOnFraJNcURld1jL1nV r/LRD+/e2gNtSTPK0Qkon6HcOBZnxRoqtazTU6YQRmGlT0v+rukj/cn5sToYibWLn+RoV1CE Qj6tApOiHBkpEsCzHGu+iDQ1WT0Idtdynst738f/uCeCMkdRu4WMZjteQaqvARFwCy3P/jpK uvzMtves5HvZw33ZwOtMCgbpce00DaET4y/UzsBNBFsZNTUBCACfQfpSsWJZyi+SHoRdVyX5 J6rI7okc4+b571a7RXD5UhS9dlVRVVAtrU9ANSLqPTQKGVxHrqD39XSw8hxK61pw8p90pg4G /N3iuWEvyt+t0SxDDkClnGsDyRhlUyEWYFEoBrrCizbmahOUwqkJbNMfzj5Y7n7OIJOxNRkB IBOjPdF26dMP69BwePQao1M8Acrrex9sAHYjQGyVmReRjVEtv9iG4DoTsnIR3amKVk6si4Ea X/mrapJqSCcBUVYUFH8M7bsm4CSxier5ofy8jTEa/CfvkqpKThTMCQPNZKY7hke5qEq1CBk2 wxhX48ZrJEFf1v3NuV3OimgsF2odzieNABEBAAHCwXwEGAEKACYCGwwWIQSpQNQ0mSwujpkQ PVAiT6fnzIKmZAUCZ8gcVAUJFhTonwAKCRAiT6fnzIKmZLY8D/9uo3Ut9yi2YCuASWxr7QQZ lJCViArjymbxYB5NdOeC50/0gnhK4pgdHlE2MdwF6o34x7TPFGpjNFvycZqccSQPJ/gibwNA zx3q9vJT4Vw+YbiyS53iSBLXMweeVV1Jd9IjAoL+EqB0cbxoFXvnjkvP1foiiF5r73jCd4PR rD+GoX5BZ7AZmFYmuJYBm28STM2NA6LhT0X+2su16f/HtummENKcMwom0hNu3MBNPUOrujtW khQrWcJNAAsy4yMoJ2Lw51T/5X5Hc7jQ9da9fyqu+phqlVtn70qpPvgWy4HRhr25fCAEXZDp xG4RNmTm+pqorHOqhBkI7wA7P/nyPo7ZEc3L+ZkQ37u0nlOyrjbNUniPGxPxv1imVq8IyycG AN5FaFxtiELK22gvudghLJaDiRBhn8/AhXc642/Z/yIpizE2xG4KU4AXzb6C+o7LX/WmmsWP Ly6jamSg6tvrdo4/e87lUedEqCtrp2o1xpn5zongf6cQkaLZKQcBQnPmgHO5OG8+50u88D9I rywqgzTUhHFKKF6/9L/lYtrNcHU8Z6Y4Ju/MLUiNYkmtrGIMnkjKCiRqlRrZE/v5YFHbayRD dJKXobXTtCBYpLJM4ZYRpGZXne/FAtWNe4KbNJJqxMvrTOrnIatPj8NhBVI0RSJRsbilh6TE m6M14QORSWTLRg== In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam05 X-Stat-Signature: gigk1x4suob8y3jarjtgj1fgmkhcykyj X-Rspam-User: X-Rspamd-Queue-Id: C563D2000C X-HE-Tag: 1760120852-880697 X-HE-Meta: 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 hBYTvZWh 56k6E4W3GcIgJbYhtwuf5i0MnTnEzNyjHmkXGLJoGgY5Yiqi93yRj3N+BPBUEZw0IP0In5bacCPmlp85UNz2AbmBgGmdp4nzQ4sfqGVTSR3agnBJ1hfLOS3isS8r20sGYMXz026RCGT6lvPtKHojDWbKeP53anKaedCy17ug8eKLSQFJ3pWiR+lY/nZTa8+BUoPlxV6lnukdf1Z2Qby5XmZjaQpGvz64FOwhJ/lQFSTdprWjk2QWaEWKd/TKA9YUm+iIcI/6TFBJieXZ41DjEdcIz5W8h6Ug0raDoCmI8gqs3ze5v4FB8b8yEEQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 10/10/25 20:19, Linus Torvalds wrote: > On Fri, 10 Oct 2025 at 08:11, Phil Auld wrote: >> >> After several days of failed boots I've gotten it down to these two >> commits. >> >> 59faa4da7cd4 maple_tree: use percpu sheaves for maple_node_cache >> 3accabda4da1 mm, vma: use percpu sheaves for vm_area_struct cache >> >> The first is such an early failure it's silent. With just 3acca I >> get : >> >> [ 9.341152] BUG: kernel NULL pointer dereference, address: 0000000000000040 >> [ 9.348115] #PF: supervisor read access in kernel mode >> [ 9.353264] #PF: error_code(0x0000) - not-present page >> [ 9.358413] PGD 0 P4D 0 >> [ 9.360959] Oops: Oops: 0000 [#1] SMP NOPTI >> [ 9.365154] CPU: 21 UID: 0 PID: 818 Comm: kworker/u398:0 Not tainted 6.17.0-rc3.slab+ #5 PREEMPT(voluntary) >> [ 9.374982] Hardware name: Dell Inc. PowerEdge R7425/02MJ3T, BIOS 1.26.0 07/30/2025 >> [ 9.382641] RIP: 0010:__pcs_replace_empty_main+0x44/0x1d0 >> [ 9.388048] Code: ec 08 48 8b 46 10 48 8b 76 08 48 85 c0 74 0b 8b 48 18 85 c9 0f 85 e5 00 00 00 65 48 63 05 e4 ee 50 02 49 8b 84 c6 e0 00 00 00 <4c> 8b 68 40 4c 89 ef e8 b0 81 ff ff 48 89 c5 48 85 c0 74 1d 48 89 > > That decodes to > > 0: mov 0x10(%rsi),%rax > 4: mov 0x8(%rsi),%rsi > 8: test %rax,%rax > b: je 0x18 > d: mov 0x18(%rax),%ecx > 10: test %ecx,%ecx > 12: jne 0xfd > 18: movslq %gs:0x250eee4(%rip),%rax > 20: mov 0xe0(%r14,%rax,8),%rax > 28:* mov 0x40(%rax),%r13 <-- trapping instruction > 2c: mov %r13,%rdi > 2f: call 0xffffffffffff81e4 > 34: mov %rax,%rbp > 37: test %rax,%rax > 3a: je 0x59 > > which is the code around that barn_replace_empty_sheaf() call. > > In particular, the trapping instruction is from get_barn(), it's the "->barn" in > > return get_node(s, numa_mem_id())->barn; > > so it looks like 'get_node()' is returning NULL here: > > return s->node[node]; > > That 0x250eee4(%rip) is from "get_node()" becoming > > 18: movslq %gs:numa_node(%rip), %rax # node > 20: mov 0xe0(%r14,%rax,8),%rax # ->node[node] > > instruction, and then that ->barn dereference is the trapping > instruction that tries to read node->barn: > > 28:* mov 0x40(%rax),%r13 # node->barn > > but I did *not* look into why s->node[node] would be NULL. > > Over to you Vlastimil, Thanks, yeah will look ASAP. I suspect the "nodes with zero memory" is something that might not be handled well in general on x86. I know powerpc used to do these kind of setups first and they have some special handling, so numa_mem_id() would give you the closest node with memory in there and I suspect it's not happening here. CPU 21 is node 6 so it's one of those without memory. I'll see if I can simulate this with QEMU and what's the most sensible fix > Linus