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Content-Language: en-US To: Kuniyuki Iwashima , Andrew Morton Cc: Christoph Lameter , David Rientjes , Roman Gushchin , Harry Yoo , Alexei Starovoitov , Kuniyuki Iwashima , linux-mm@kvack.org, syzbot+a6f4d69b9b23404bbabf@syzkaller.appspotmail.com References: <20251007052534.2776661-1-kuniyu@google.com> 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: <20251007052534.2776661-1-kuniyu@google.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Action: no action X-Rspamd-Queue-Id: D72721A0012 X-Rspamd-Server: rspam11 X-Rspam-User: X-Stat-Signature: b9oyw6hr8xhgehszuia65tm7xxwfsg8o X-HE-Tag: 1759823162-545166 X-HE-Meta: U2FsdGVkX1/mYYJZ9KtH/pAdQjbsmLZxkc5Zsytzcfb6+YwQZBD3TnZmi60mWrme6U8MXDHjhgWKEmzpx/hCPpKTUs3p7MP3wyRUny84NZHIJ9FSrFqLun5wKq2H3PijVEV/6m2vMwX9EAM7dvkoV04N99iV/FNfuAVV31iW4hXb8TxGVbPu5rBbnw1dHrb3pZxQ6bNCic+VbL5FHbGgemEahb+Iu2sKfMziqtX0ALa2+U/sxLCfSrH3lBqEAAit9A/APad96FgjmIyHsuTOey4wwZtQ3c225BdxN8TlIFzWkaCpMm+kweynNw3xmn6pgPKc8vJZRxGbbgodUn6M7d83VJGcqfbnOwytywnhW+yrm2YvDYgNHAaP2qdfUMgA5oFWjivFpkFq0JzT5I52KOBBsi+q2u3hTl3g+IkVHJpYtCIU8T41EtwrXhB1Bn9Jdd6RSqWcqr6y2Gu8a9zlbEzE8vPKD0MFt0S9w40f42gMpSVGosYGTKmhXIiMPTf4WfGEHIxzthC8JEukQBY7+dHkRG4X3Vsd+lgq+YokS6dD6fr6i39/ShDWmkTFOhwT013eGrDbY5i57XPhby7pbARtRN97BUYdsQyX5ogY4Uh3qUAQZiq0tP66dg+0GOVsXEppCuNoxjtEelLVfF4LqS9o4e+hgq7B+yn9RGtnaHbch+a3A7GA3FjUFuaK0ZXFHp9xagXlHbyQCXBdWUEz4GKH4VKm/Y1T7hxJ4JfQ1xe/HGOFDtj8+ZLW/25zs1vq3zJFLLhxyqZ9G5bLqX3553gTGCbBEU//hw+Y1l3leROka9+QoYj1h1iD8Fk5eLqq/wmQh++sVjNzF2vKDZR1B1xQNyigUD0HC110zQ1FsnnieRlrW7Y6jaFJSk03ojEW069oHjUCYjqi/MZBwjzC4e1KspQpAwMAQN4nOl+5neAwVt+93Aw6G5D2lMWp7jeSP2E6+A3D5LeR44Fv21y czpZeUJ6 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 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 10/7/25 07:25, Kuniyuki Iwashima wrote: > syzbot reported the lockdep splat below in __kmem_cache_release(). [0] > > The problem is that __kmem_cache_release() could be called from > do_kmem_cache_create() before init_kmem_cache_cpus() registers > the lockdep key. > > Let's move lockdep_unregister_key() from __kmem_cache_release() > to slab_kmem_cache_release() and do_kmem_cache_create(). > > [0]: > WARNING: CPU: 1 PID: 6128 at kernel/locking/lockdep.c:6606 lockdep_unregister_key+0x2ca/0x310 kernel/locking/lockdep.c:6606 > Modules linked in: > CPU: 1 UID: 0 PID: 6128 Comm: syz.4.21 Not tainted syzkaller #0 PREEMPT_{RT,(full)} > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 > RIP: 0010:lockdep_unregister_key+0x2ca/0x310 kernel/locking/lockdep.c:6606 > Code: 50 e4 0f 48 3b 44 24 10 0f 84 26 fe ff ff e8 bd cd 17 09 e8 e8 ce 17 09 41 f7 c7 00 02 00 00 74 bd fb 40 84 ed 75 bc eb cd 90 <0f> 0b 90 e9 19 ff ff ff 90 0f 0b 90 e9 2a ff ff ff 48 c7 c7 d0 ac > RSP: 0018:ffffc90003e870d0 EFLAGS: 00010002 > RAX: eb1525397f5bdf00 RBX: ffff88803c121148 RCX: 1ffff920007d0dfc > RDX: 0000000000000000 RSI: ffffffff8acb1500 RDI: ffffffff8b1dd0e0 > RBP: 00000000ffffffea R08: ffffffff8eb5aa37 R09: 1ffffffff1d6b546 > R10: dffffc0000000000 R11: fffffbfff1d6b547 R12: 0000000000000000 > R13: ffff88814d1b8900 R14: 0000000000000000 R15: 0000000000000203 > FS: 00007f773f75e6c0(0000) GS:ffff88812712f000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007ffdaea3af52 CR3: 000000003a5ca000 CR4: 00000000003526f0 > Call Trace: > > __kmem_cache_release+0xe3/0x1e0 mm/slub.c:7696 > do_kmem_cache_create+0x74e/0x790 mm/slub.c:8575 > create_cache mm/slab_common.c:242 [inline] > __kmem_cache_create_args+0x1ce/0x330 mm/slab_common.c:340 > nfsd_file_cache_init+0x1d6/0x530 fs/nfsd/filecache.c:816 > nfsd_startup_generic fs/nfsd/nfssvc.c:282 [inline] > nfsd_startup_net fs/nfsd/nfssvc.c:377 [inline] > nfsd_svc+0x393/0x900 fs/nfsd/nfssvc.c:786 > nfsd_nl_threads_set_doit+0x84a/0x960 fs/nfsd/nfsctl.c:1639 > genl_family_rcv_msg_doit+0x212/0x300 net/netlink/genetlink.c:1115 > genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] > genl_rcv_msg+0x60e/0x790 net/netlink/genetlink.c:1210 > netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2552 > genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 > netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] > netlink_unicast+0x846/0xa10 net/netlink/af_netlink.c:1346 > netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896 > sock_sendmsg_nosec net/socket.c:727 [inline] > __sock_sendmsg+0x219/0x270 net/socket.c:742 > ____sys_sendmsg+0x508/0x820 net/socket.c:2630 > ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2684 > __sys_sendmsg net/socket.c:2716 [inline] > __do_sys_sendmsg net/socket.c:2721 [inline] > __se_sys_sendmsg net/socket.c:2719 [inline] > __x64_sys_sendmsg+0x1a1/0x260 net/socket.c:2719 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7f77400eeec9 > Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007f773f75e038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e > RAX: ffffffffffffffda RBX: 00007f7740345fa0 RCX: 00007f77400eeec9 > RDX: 0000000000008004 RSI: 0000200000000180 RDI: 0000000000000006 > RBP: 00007f7740171f91 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 > R13: 00007f7740346038 R14: 00007f7740345fa0 R15: 00007ffce616f8d8 > > > Fixes: 83382af9ddc3 ("slab: Make slub local_(try)lock more precise for LOCKDEP") > Reported-by: syzbot+a6f4d69b9b23404bbabf@syzkaller.appspotmail.com > Closes: https://lore.kernel.org/all/68e4a3d1.a00a0220.298cc0.0471.GAE@google.com/ > Signed-off-by: Kuniyuki Iwashima Thanks, added to slab/for-next-fixes