ci starts bisection 2023-06-26 16:49:48.18564948 +0000 UTC m=+888.556166499
bisecting fixing commit since e8bc52cb8df80c31c73c726ab58ea9746e9ff734
building syzkaller on aea5da898f473385f3b66c94f8aa49ca9a1c9744
ensuring issue is reproducible on original commit e8bc52cb8df80c31c73c726ab58ea9746e9ff734

testing commit e8bc52cb8df80c31c73c726ab58ea9746e9ff734 gcc
compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 4917a41d867de220c6a62a8f01d23680db3b86504e44c22520e9594cdd2f9221
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: OK
run #7: OK
run #8: OK
run #9: OK
run #10: OK
run #11: OK
run #12: OK
run #13: OK
run #14: OK
run #15: OK
run #16: OK
run #17: OK
run #18: OK
run #19: OK
reproducer seems to be flaky
testing current HEAD 6995e2de6891c724bfeb2db33d7b87775f913ad1
testing commit 6995e2de6891c724bfeb2db33d7b87775f913ad1 gcc
compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: d561115434841561509e0f26cce1d9f5a85c8b33978991fc985da68d612e4da9
all runs: crashed: KASAN: out-of-bounds Write in end_buffer_read_sync
crash still not fixed/happens on the oldest tested release
Reproducer flagged being flaky
revisions tested: 2, total time: 38m39.788745071s (build: 15m30.166787448s, test: 21m53.499408216s)
crash still not fixed on HEAD or HEAD had kernel test errors
commit msg: Linux 6.4
crash: KASAN: out-of-bounds Write in end_buffer_read_sync
==================================================================
BUG: KASAN: out-of-bounds in end_buffer_read_sync+0x89/0x90
Write of size 4 at addr ffffc9000abb7800 by task ksoftirqd/0/15

CPU: 0 PID: 15 Comm: ksoftirqd/0 Not tainted 6.4.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
Call Trace:
 <TASK>
 dump_stack_lvl+0x167/0x220
 print_report+0x163/0x540
 kasan_report+0x176/0x1b0
 kasan_check_range+0x283/0x290
 end_buffer_read_sync+0x89/0x90
 end_bio_bh_io_sync+0x8d/0xe0
 blk_update_request+0x3fb/0x1080
 blk_mq_end_request+0x48/0x260
 blk_done_softirq+0x83/0x120
 __do_softirq+0x2ab/0x908
 run_ksoftirqd+0xc5/0x120
 smpboot_thread_fn+0x534/0x890
 kthread+0x276/0x2f0
 ret_from_fork+0x1f/0x30
 </TASK>

The buggy address belongs to the virtual mapping at
 [ffffc9000abb0000, ffffc9000abb9000) created by:
 copy_process+0x40a/0x3bf0

The buggy address belongs to the physical page:
page:ffffea0000950340 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2540d
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
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 21701, tgid 21701 (syz-executor393), ts 486555143246, free_ts 486514933342
 get_page_from_freelist+0x321c/0x33a0
 __alloc_pages+0x255/0x670
 __vmalloc_node_range+0x7bb/0x1090
 dup_task_struct+0x5c3/0x720
 copy_process+0x40a/0x3bf0
 kernel_clone+0x19a/0x5f0
 __x64_sys_clone+0x253/0x2a0
 do_syscall_64+0x41/0xc0
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
page last free stack trace:
 free_unref_page_prepare+0x8fe/0xa10
 free_unref_page+0x37/0x3f0
 vfree+0x11f/0x240
 delayed_vfree_work+0x3c/0x70
 process_one_work+0x797/0xe20
 worker_thread+0x8c9/0xfd0
 kthread+0x276/0x2f0
 ret_from_fork+0x1f/0x30

Memory state around the buggy address:
 ffffc9000abb7700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc9000abb7780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc9000abb7800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                      ^
 ffffc9000abb7880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc9000abb7900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================