ci starts bisection 2023-02-24 22:48:07.523777756 +0000 UTC m=+32211.726355670 bisecting fixing commit since a962b54e162c2977ff37905726cab29728380835 building syzkaller on feb5635181eb12a6e3516172a3f5af06a3bc93e1 ensuring issue is reproducible on original commit a962b54e162c2977ff37905726cab29728380835 testing commit a962b54e162c2977ff37905726cab29728380835 gcc compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 09c3aadf65ab7897ca7989c6f097b1b90af02b3c9108b43b5d8c3b7d93f376fc run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in corrupted run #6: crashed: INFO: rcu detected stall in corrupted run #7: crashed: INFO: rcu detected stall in corrupted run #8: crashed: INFO: rcu detected stall in corrupted run #9: crashed: INFO: rcu detected stall in corrupted run #10: crashed: INFO: rcu detected stall in corrupted run #11: crashed: INFO: rcu detected stall in corrupted run #12: crashed: INFO: rcu detected stall in corrupted run #13: OK run #14: OK run #15: OK run #16: OK run #17: OK run #18: OK run #19: OK testing current HEAD a93e884edf61f9debc9ca61ef9e545f0394ab666 testing commit a93e884edf61f9debc9ca61ef9e545f0394ab666 gcc compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 9bce163a08d347eeb9d5ebbe749f19835c2eb579f8faee513c7b05cbc27a8529 all runs: crashed: KASAN: out-of-bounds Write in end_buffer_read_sync revisions tested: 2, total time: 34m53.650668334s (build: 13m31.226443615s, test: 20m32.248284344s) the crash still happens on HEAD commit msg: Merge tag 'driver-core-6.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core crash: KASAN: out-of-bounds Write in end_buffer_read_sync ================================================================== BUG: KASAN: out-of-bounds in instrument_atomic_read_write include/linux/instrumented.h:102 [inline] BUG: KASAN: out-of-bounds in atomic_dec include/linux/atomic/atomic-instrumented.h:257 [inline] BUG: KASAN: out-of-bounds in put_bh include/linux/buffer_head.h:323 [inline] BUG: KASAN: out-of-bounds in end_buffer_read_sync+0x5c/0x90 fs/buffer.c:161 Write of size 4 at addr ffffc9000b86f9a8 by task ksoftirqd/0/15 CPU: 0 PID: 15 Comm: ksoftirqd/0 Not tainted 6.2.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x60/0xa0 lib/dump_stack.c:106 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:319 print_report mm/kasan/report.c:430 [inline] kasan_report+0x118/0x130 mm/kasan/report.c:536 check_region_inline mm/kasan/generic.c:181 [inline] kasan_check_range+0x13d/0x180 mm/kasan/generic.c:187 instrument_atomic_read_write include/linux/instrumented.h:102 [inline] atomic_dec include/linux/atomic/atomic-instrumented.h:257 [inline] put_bh include/linux/buffer_head.h:323 [inline] end_buffer_read_sync+0x5c/0x90 fs/buffer.c:161 end_bio_bh_io_sync+0xa9/0xf0 fs/buffer.c:2703 req_bio_endio block/blk-mq.c:795 [inline] blk_update_request+0x31f/0x1320 block/blk-mq.c:927 blk_mq_end_request+0x46/0x70 block/blk-mq.c:1054 blk_complete_reqs+0xa0/0xd0 block/blk-mq.c:1132 __do_softirq+0x2df/0xadf kernel/softirq.c:571 run_ksoftirqd kernel/softirq.c:934 [inline] run_ksoftirqd+0x2d/0x60 kernel/softirq.c:926 smpboot_thread_fn+0x548/0x8f0 kernel/smpboot.c:164 kthread+0x294/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 The buggy address belongs to the virtual mapping at [ffffc9000b868000, ffffc9000b871000) created by: kernel_clone+0xb8/0x720 kernel/fork.c:2684 The buggy address belongs to the physical page: page:ffffea000070b400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1c2d0 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x102dc2(GFP_HIGHUSER|__GFP_NOWARN|__GFP_ZERO), pid 18192, tgid 18192 (syz-executor116), ts 443352929422, free_ts 443211991052 prep_new_page mm/page_alloc.c:2552 [inline] get_page_from_freelist+0x1190/0x2f80 mm/page_alloc.c:4325 __alloc_pages+0x1c7/0x5b0 mm/page_alloc.c:5591 vm_area_alloc_pages mm/vmalloc.c:2943 [inline] __vmalloc_area_node mm/vmalloc.c:3011 [inline] __vmalloc_node_range+0x7c8/0xf50 mm/vmalloc.c:3181 alloc_thread_stack_node kernel/fork.c:311 [inline] dup_task_struct kernel/fork.c:984 [inline] copy_process+0x10db/0x6c40 kernel/fork.c:2100 kernel_clone+0xb8/0x720 kernel/fork.c:2684 __do_sys_clone+0xa1/0xe0 kernel/fork.c:2825 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1453 [inline] free_pcp_prepare+0x65a/0xb40 mm/page_alloc.c:1503 free_unref_page_prepare mm/page_alloc.c:3387 [inline] free_unref_page_list+0x172/0xcd0 mm/page_alloc.c:3528 release_pages+0x31c/0x10c0 mm/swap.c:1042 tlb_batch_pages_flush+0x85/0x160 mm/mmu_gather.c:97 tlb_flush_mmu_free mm/mmu_gather.c:292 [inline] tlb_flush_mmu mm/mmu_gather.c:299 [inline] tlb_finish_mmu+0x110/0x6c0 mm/mmu_gather.c:391 exit_mmap+0x1cc/0x620 mm/mmap.c:3047 __mmput+0xf3/0x440 kernel/fork.c:1209 exit_mm kernel/exit.c:563 [inline] do_exit+0x885/0x2500 kernel/exit.c:856 do_group_exit+0xb0/0x250 kernel/exit.c:1019 __do_sys_exit_group kernel/exit.c:1030 [inline] __se_sys_exit_group kernel/exit.c:1028 [inline] __x64_sys_exit_group+0x35/0x40 kernel/exit.c:1028 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffffc9000b86f880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc9000b86f900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 >ffffc9000b86f980: f1 f1 f1 f1 01 f2 00 f2 f2 f2 00 00 00 00 00 00 ^ ffffc9000b86fa00: 00 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 ffffc9000b86fa80: 00 f1 f1 f1 f1 00 f3 f3 f3 00 00 00 00 00 00 00 ==================================================================