ci starts bisection 2023-03-27 10:07:23.687588472 +0000 UTC m=+4456.089544735 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: 37b88f06552a11f2d2c27513f05813ff2e047bdbae6836fffc262d6c62617ea2 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: crashed: INFO: rcu detected stall in corrupted run #14: crashed: INFO: rcu detected stall in corrupted run #15: crashed: INFO: rcu detected stall in corrupted run #16: crashed: INFO: rcu detected stall in corrupted run #17: crashed: BUG: unable to handle kernel paging request in inode_wait_for_writeback run #18: OK run #19: OK testing current HEAD 197b6b60ae7bc51dd0814953c562833143b292aa testing commit 197b6b60ae7bc51dd0814953c562833143b292aa gcc compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 7e6f172111f2ac7c40f0149046dec56215cb46381eb2248ee782fa97afeacef5 all runs: crashed: KASAN: out-of-bounds Write in end_buffer_read_sync revisions tested: 2, total time: 33m9.069043993s (build: 14m11.662477918s, test: 18m7.724173907s) the crash still happens on HEAD commit msg: Linux 6.3-rc4 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 ffffc900053ef9a8 by task ksoftirqd/0/15 CPU: 0 PID: 15 Comm: ksoftirqd/0 Not tainted 6.3.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 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+0x2ee/0x1180 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+0x1d0/0x901 kernel/softirq.c:571 run_ksoftirqd kernel/softirq.c:934 [inline] run_ksoftirqd+0x2d/0x60 kernel/softirq.c:926 smpboot_thread_fn+0x548/0x8c0 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 [ffffc900053e8000, ffffc900053f1000) created by: kernel_clone+0xb8/0x5f0 kernel/fork.c:2679 The buggy address belongs to the physical page: page:ffffea000072a800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1caa0 memcg:ffff88801bbad682 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000001ffffffff ffff88801bbad682 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 14691, tgid 14691 (syz-executor.0), ts 278614232458, free_ts 278528469919 prep_new_page mm/page_alloc.c:2553 [inline] get_page_from_freelist+0x1190/0x2e20 mm/page_alloc.c:4326 __alloc_pages+0x1c7/0x490 mm/page_alloc.c:5592 vm_area_alloc_pages mm/vmalloc.c:2953 [inline] __vmalloc_area_node mm/vmalloc.c:3029 [inline] __vmalloc_node_range+0x7ed/0xfc0 mm/vmalloc.c:3199 alloc_thread_stack_node kernel/fork.c:311 [inline] dup_task_struct kernel/fork.c:979 [inline] copy_process+0x10db/0x6b40 kernel/fork.c:2095 kernel_clone+0xb8/0x5f0 kernel/fork.c:2679 __do_sys_clone+0xa1/0xe0 kernel/fork.c:2820 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:1454 [inline] free_pcp_prepare+0x5c7/0xa30 mm/page_alloc.c:1504 free_unref_page_prepare mm/page_alloc.c:3388 [inline] free_unref_page+0x19/0x480 mm/page_alloc.c:3483 vfree+0x120/0x730 mm/vmalloc.c:2742 delayed_vfree_work+0x46/0x70 mm/vmalloc.c:2663 process_one_work+0x865/0x13f0 kernel/workqueue.c:2390 worker_thread+0x598/0xec0 kernel/workqueue.c:2537 kthread+0x294/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Memory state around the buggy address: ffffc900053ef880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc900053ef900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffc900053ef980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffffc900053efa00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc900053efa80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================