Dear Liam, dear Matthew, dear all, The reproducer for the 'memory leak in __anon_vma_prepare' bug (see https://elisa-builder-00.iol.unh.edu/syzkaller-next/report?id=3113810b9abd3dfeb581759df93d3171d1a90f18) is reproducible, it is triggering the memory leak on the current mainline (commit 60bb8154d1d7), and it was not triggering on v6.0. My build config is a x86_64 defconfig. My git bisection showed that: 524e00b36e8c547f5582eef3fb645a8d9fc5e3df is the first bad commit commit 524e00b36e8c547f5582eef3fb645a8d9fc5e3df Author: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx> Date: Tue Sep 6 19:48:48 2022 +0000 The git bisect log is below, note that the commits 7fdbd37da5c6, d0cf3dd47f0d and 0c563f148043 are marked good in the git bisect as they caused bugs "BUG: Bad rss-counter state mm: ... type:MM_ANONPAGES val:2". This bug report might have overshadowed the actual issue, and hence the bug might have been introduced earlier, but was only visible once the Bad rss-counter state bug disappeared. git bisect start # bad: [60bb8154d1d77042a5d43d335a68fdb202302cbe] Merge tag 'xfs-6.1-for-linus' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux git bisect bad 60bb8154d1d77042a5d43d335a68fdb202302cbe # good: [4fe89d07dcc2804c8b562f6c7896a45643d34b2f] Linux 6.0 git bisect good 4fe89d07dcc2804c8b562f6c7896a45643d34b2f # good: [ff6862c23d2e83d12d1759bf4337d41248fb4dc8] Merge tag 'arm-drivers-6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc git bisect good ff6862c23d2e83d12d1759bf4337d41248fb4dc8 # good: [e8bc52cb8df80c31c73c726ab58ea9746e9ff734] Merge tag 'driver-core-6.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core git bisect good e8bc52cb8df80c31c73c726ab58ea9746e9ff734 # good: [4899a36f91a9f9b06878471096bd143e7253006d] Merge tag 'powerpc-6.1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux git bisect good 4899a36f91a9f9b06878471096bd143e7253006d # good: [0e0073eb1b60f4ec6faecea034a6772fe1409a88] Merge tag 'hyperv-next-signed-20221009' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux git bisect good 0e0073eb1b60f4ec6faecea034a6772fe1409a88 # bad: [2f3568017268fc34eb0b6b4b3163c0f2e619fde6] kasan: move kasan_get_*_meta to generic.c git bisect bad 2f3568017268fc34eb0b6b4b3163c0f2e619fde6 # good: [354ed597442952fb680c9cafc7e4eb8a76f9514c] mm: multi-gen LRU: kill switch git bisect good 354ed597442952fb680c9cafc7e4eb8a76f9514c # bad: [b3541d912a84dc40cabb516f2deeac9ae6fa30da] mm: delete unused MMF_OOM_VICTIM flag git bisect bad b3541d912a84dc40cabb516f2deeac9ae6fa30da # bad: [67e7c16764c3cbf84a57d441fba3474217ac08d6] mm/mmap: change do_brk_munmap() to use do_mas_align_munmap() git bisect bad 67e7c16764c3cbf84a57d441fba3474217ac08d6 # good: [e15e06a8392321a19d8ebdbdd7643b7fa8874c17] lib/test_maple_tree: add testing for maple tree git bisect good e15e06a8392321a19d8ebdbdd7643b7fa8874c17 # bad: [3b0e81a1cdc9afbddb0543d08e38edb4e33c4baf] mmap: change zeroing of maple tree in __vma_adjust() git bisect bad 3b0e81a1cdc9afbddb0543d08e38edb4e33c4baf # good: [7fdbd37da5c6ff002dc6d15e89a7708c2df4928e] mm/mmap: use the maple tree for find_vma_prev() instead of the rbtree git bisect good 7fdbd37da5c6ff002dc6d15e89a7708c2df4928e # good: [d0cf3dd47f0d5d3bc366063f455215b99b06d62b] damon: convert __damon_va_three_regions to use the VMA iterator git bisect good d0cf3dd47f0d5d3bc366063f455215b99b06d62b # bad: [524e00b36e8c547f5582eef3fb645a8d9fc5e3df] mm: remove rb tree. git bisect bad 524e00b36e8c547f5582eef3fb645a8d9fc5e3df # good: [0c563f148043569c81724ee0f9c5bad5a36b115a] proc: remove VMA rbtree use from nommu git bisect good 0c563f148043569c81724ee0f9c5bad5a36b115a # first bad commit: [524e00b36e8c547f5582eef3fb645a8d9fc5e3df] mm: remove rb tree. If there is more information needed or other bisection to be done, please let me know. Best regards, Lukas
