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Cheers, Lorenzo [0]: https://lore.kernel.org/linux-mm/cover.1768569863.git.lorenzo.stoakes@oracle.com/ On Fri, Jan 16, 2026 at 05:51:01AM -0800, syzbot ci wrote: > syzbot ci has tested the following series > > [v1] add and use vma_assert_stabilised() helper > https://lore.kernel.org/all/cover.1768558900.git.lorenzo.stoakes@oracle.com > * [PATCH 1/2] mm/vma: add vma_is_*_locked() helpers > * [PATCH 2/2] mm: add + use vma_is_stabilised(), vma_assert_stabilised() helpers > > and found the following issue: > kernel BUG in anon_vma_name > > Full report is available here: > https://ci.syzbot.org/series/a3867085-bae4-4416-9704-3b23ef9c6006 > > *** > > kernel BUG in anon_vma_name > > tree: mm-new > URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/akpm/mm.git > base: eeb33083cc4749bdb61582eaeb5c200702607703 > arch: amd64 > compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 > config: https://ci.syzbot.org/builds/2e5b4d7e-a1a9-48c8-ae3b-654d3ac32e5c/config > > Loaded X.509 cert 'Build time autogenerated kernel key: 65176d093d4baf94ab1e788ee9f46804766f83ba' > ima: Allocated hash algorithm: sha256 > ima: No architecture policies found > evm: Initialising EVM extended attributes: > evm: security.selinux (disabled) > evm: security.SMACK64 (disabled) > evm: security.SMACK64EXEC (disabled) > evm: security.SMACK64TRANSMUTE (disabled) > evm: security.SMACK64MMAP (disabled) > evm: security.apparmor > evm: security.ima > evm: security.capability > evm: HMAC attrs: 0x1 > PM: Magic number: 10:472:582 > tty ptyc0: hash matches > netconsole: network logging started > gtp: GTP module loaded (pdp ctx size 128 bytes) > rdma_rxe: loaded > cfg80211: Loading compiled-in X.509 certificates for regulatory database > Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7' > Loaded X.509 cert 'wens: 61c038651aabdcf94bd0ac7ff06c7248db18c600' > clk: Disabling unused clocks > ALSA device list: > #0: Dummy 1 > #1: Loopback 1 > #2: Virtual MIDI Card 1 > check access for rdinit=/init failed: -2, ignoring > md: Waiting for all devices to be available before autodetect > md: If you don't use raid, use raid=noautodetect > md: Autodetecting RAID arrays. > md: autorun ... > md: ... autorun DONE. > EXT4-fs (sda1): mounted filesystem b4773fba-1738-4da0-8a90-0fe043d0a496 ro with ordered data mode. Quota mode: none. > VFS: Mounted root (ext4 filesystem) readonly on device 8:1. > devtmpfs: mounted > Freeing unused kernel image (initmem) memory: 26044K > Write protecting the kernel read-only data: 212992k > Freeing unused kernel image (text/rodata gap) memory: 388K > Freeing unused kernel image (rodata/data gap) memory: 1776K > x86/mm: Checked W+X mappings: passed, no W+X pages found. > x86/mm: Checking user space page tables > x86/mm: Checked W+X mappings: passed, no W+X pages found. > Failed to set sysctl parameter 'max_rcu_stall_to_panic=1': parameter not found > Run /sbin/init as init process > vma ffff888175272d80 start 00007fffffffe000 end 00007ffffffff000 mm ffff888100079880 > prot 8000000000000025 anon_vma ffff888110bf8000 vm_ops 0000000000000000 > pgoff 7fffffffe file 0000000000000000 private_data 0000000000000000 > refcnt 1 > flags: 0x8118173(read|write|mayread|maywrite|mayexec|growsdown|seqread|randread|account|softdirty) > ------------[ cut here ]------------ > kernel BUG at ./include/linux/mmap_lock.h:476! > Oops: invalid opcode: 0000 [#1] SMP KASAN PTI > CPU: 0 UID: 0 PID: 1 Comm: init Not tainted syzkaller #0 PREEMPT(full) > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 > RIP: 0010:anon_vma_name+0x253/0x260 > Code: ff 4c 89 ff e8 8e 7d 0a 00 e9 e9 fe ff ff e8 34 db a2 ff eb 0c e8 2d db a2 ff eb 05 e8 26 db a2 ff 48 89 df e8 6e 77 08 ff 90 <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 > RSP: 0000:ffffc90000067550 EFLAGS: 00010286 > RAX: 000000000000014c RBX: ffff888175272d80 RCX: 37717524f4bb9000 > RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 > RBP: 0000000000000003 R08: 0000000000000003 R09: 0000000000000004 > R10: dffffc0000000000 R11: fffffbfff1c3ae40 R12: dffffc0000000000 > R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000001 > FS: 0000000000000000(0000) GS:ffff88818e405000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: ffff88823ffff000 CR3: 0000000110c5a000 CR4: 00000000000006f0 > Call Trace: > > vma_modify_flags+0x203/0x330 > mprotect_fixup+0x46a/0xa50 > setup_arg_pages+0x565/0xae0 > load_elf_binary+0xc5e/0x2980 > bprm_execve+0x93d/0x1410 > kernel_execve+0x8ef/0x9e0 > try_to_run_init_process+0x13/0x60 > kernel_init+0xad/0x1d0 > ret_from_fork+0x51b/0xa40 > ret_from_fork_asm+0x1a/0x30 > > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:anon_vma_name+0x253/0x260 > Code: ff 4c 89 ff e8 8e 7d 0a 00 e9 e9 fe ff ff e8 34 db a2 ff eb 0c e8 2d db a2 ff eb 05 e8 26 db a2 ff 48 89 df e8 6e 77 08 ff 90 <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 > RSP: 0000:ffffc90000067550 EFLAGS: 00010286 > RAX: 000000000000014c RBX: ffff888175272d80 RCX: 37717524f4bb9000 > RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 > RBP: 0000000000000003 R08: 0000000000000003 R09: 0000000000000004 > R10: dffffc0000000000 R11: fffffbfff1c3ae40 R12: dffffc0000000000 > R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000001 > FS: 0000000000000000(0000) GS:ffff88818e405000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: ffff88823ffff000 CR3: 0000000110c5a000 CR4: 00000000000006f0 > > > *** > > If these findings have caused you to resend the series or submit a > separate fix, please add the following tag to your commit message: > Tested-by: syzbot@syzkaller.appspotmail.com > > --- > This report is generated by a bot. It may contain errors. > syzbot ci engineers can be reached at syzkaller@googlegroups.com.