================================================================== BUG: KCSAN: data-race in generic_write_end / next_uptodate_page write to 0xffff88810a1c0700 of 8 bytes by task 5490 on cpu 0: i_size_write include/linux/fs.h:905 [inline] generic_write_end+0xb4/0x360 fs/buffer.c:2241 ext4_da_write_end+0x4df/0x690 fs/ext4/inode.c:3010 generic_perform_write+0x253/0x3d0 mm/filemap.c:3934 ext4_buffered_write_iter+0x234/0x3e0 fs/ext4/file.c:289 ext4_file_write_iter+0xd7/0x10e0 call_write_iter include/linux/fs.h:1868 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x47b/0x780 fs/read_write.c:584 ksys_write+0xeb/0x1a0 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __x64_sys_write+0x42/0x50 fs/read_write.c:646 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd read to 0xffff88810a1c0700 of 8 bytes by task 5491 on cpu 1: i_size_read include/linux/fs.h:883 [inline] next_uptodate_page+0x47b/0x560 mm/filemap.c:3454 next_map_page mm/filemap.c:3479 [inline] filemap_map_pages+0x73c/0x860 mm/filemap.c:3551 do_fault_around mm/memory.c:4493 [inline] do_read_fault mm/memory.c:4525 [inline] do_fault mm/memory.c:4659 [inline] do_pte_missing mm/memory.c:3647 [inline] handle_pte_fault mm/memory.c:4947 [inline] __handle_mm_fault mm/memory.c:5089 [inline] handle_mm_fault+0x1120/0x2c60 mm/memory.c:5243 faultin_page mm/gup.c:925 [inline] __get_user_pages+0x363/0xc30 mm/gup.c:1147 populate_vma_page_range mm/gup.c:1543 [inline] __mm_populate+0x23d/0x370 mm/gup.c:1652 mm_populate include/linux/mm.h:3153 [inline] vm_mmap_pgoff+0x1a3/0x240 mm/util.c:548 ksys_mmap_pgoff+0x2ac/0x320 mm/mmap.c:1440 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd value changed: 0x0000000000deb000 -> 0x0000000000dec000 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 5491 Comm: syz-executor.0 Not tainted 6.4.0-rc1-syzkaller-00012-g16a8829130ca #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 ================================================================== syz-executor.0 invoked oom-killer: gfp_mask=0xcc0(GFP_KERNEL), order=0, oom_score_adj=1000 CPU: 0 PID: 5491 Comm: syz-executor.0 Not tainted 6.4.0-rc1-syzkaller-00012-g16a8829130ca #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xda/0x130 lib/dump_stack.c:106 dump_stack+0x15/0x20 lib/dump_stack.c:113 dump_header+0x95/0x3c0 mm/oom_kill.c:460 out_of_memory+0xa30/0xc30 mm/oom_kill.c:1163 mem_cgroup_out_of_memory+0x139/0x190 mm/memcontrol.c:1749 memory_max_write+0x1e3/0x270 mm/memcontrol.c:6597 cgroup_file_write+0x16b/0x310 kernel/cgroup/cgroup.c:4071 kernfs_fop_write_iter+0x1ca/0x2b0 fs/kernfs/file.c:334 call_write_iter include/linux/fs.h:1868 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x47b/0x780 fs/read_write.c:584 ksys_write+0xeb/0x1a0 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __x64_sys_write+0x42/0x50 fs/read_write.c:646 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7ff0252d0169 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff024622168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007ff0253f0050 RCX: 00007ff0252d0169 RDX: 0000000000000012 RSI: 0000000020000080 RDI: 000000000000000b RBP: 00007ff02532bca1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff3d8cac5f R14: 00007ff024622300 R15: 0000000000022000 memory: usage 80kB, limit 0kB, failcnt 192 swap: usage 0kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /syz1: anon 0 file 53248 kernel 28672 kernel_stack 0 pagetables 0 sec_pagetables 0 percpu 0 sock 0 vmalloc 0 shmem 53248 file_mapped 53248 file_dirty 0 file_writeback 0 swapcached 0 inactive_anon 0 active_anon 53248 inactive_file 0 active_file 0 unevictable 0 slab_reclaimable 5248 slab_unreclaimable 16944 slab 22192 workingset_refault_anon 0 workingset_refault_file 4 workingset_activate_anon 0 workingset_activate_file 0 workingset_restore_anon 0 workingset_restore_file 0 workingset_nodereclaim 4 pgscan 8442 pgsteal 1124 pgscan_kswapd 0 pgscan_direct 8442 pgscan_khugepaged 0 pgsteal_kswapd 0 pgsteal_direct 1124 pgsteal_khugepaged 0 pgfault 19930 pgmajfault 9242 pgrefill 4355 pgactivate 4081 pgdeactivate 3669 pglazyfree 0 pglazyfreed 0 Out of memory and no killable processes...