loop2: p3 size 2 extends beyond EOD, truncated loop2: p4 size 32768 extends beyond EOD, truncated loop2: p5 start 1024 is beyond EOD, truncated loop2: p6 size 32768 extends beyond EOD, truncated ================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:71 [inline] BUG: KASAN: null-ptr-deref in atomic64_read include/asm-generic/atomic-instrumented.h:837 [inline] BUG: KASAN: null-ptr-deref in atomic_long_read include/asm-generic/atomic-long.h:29 [inline] BUG: KASAN: null-ptr-deref in percpu_ref_exit+0x102/0x1f0 lib/percpu-refcount.c:136 Read of size 8 at addr 0000000000000000 by task syz-executor.2/8290 CPU: 0 PID: 8290 Comm: syz-executor.2 Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x198/0x1fd lib/dump_stack.c:118 __kasan_report mm/kasan/report.c:517 [inline] kasan_report.cold+0x5/0x37 mm/kasan/report.c:530 check_memory_region_inline mm/kasan/generic.c:186 [inline] check_memory_region+0x13d/0x180 mm/kasan/generic.c:192 instrument_atomic_read include/linux/instrumented.h:71 [inline] atomic64_read include/asm-generic/atomic-instrumented.h:837 [inline] atomic_long_read include/asm-generic/atomic-long.h:29 [inline] percpu_ref_exit+0x102/0x1f0 lib/percpu-refcount.c:136 hd_free_part block/partitions/../blk.h:391 [inline] part_release+0x9d/0xc0 block/partitions/core.c:262 device_release+0x9f/0x240 drivers/base/core.c:1802 kobject_cleanup lib/kobject.c:708 [inline] kobject_release lib/kobject.c:739 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x171/0x270 lib/kobject.c:756 put_device+0x1b/0x30 drivers/base/core.c:3031 add_partition+0x648/0xb00 block/partitions/core.c:493 blk_add_partition block/partitions/core.c:685 [inline] blk_add_partitions+0x9db/0xe00 block/partitions/core.c:761 bdev_disk_changed+0x208/0x390 fs/block_dev.c:1417 loop_reread_partitions+0x29/0x50 drivers/block/loop.c:658 loop_set_status+0x6da/0x1010 drivers/block/loop.c:1427 loop_set_status64 drivers/block/loop.c:1547 [inline] lo_ioctl+0x900/0x1690 drivers/block/loop.c:1715 __blkdev_driver_ioctl block/ioctl.c:224 [inline] blkdev_ioctl+0x28c/0x700 block/ioctl.c:620 block_ioctl+0xf9/0x140 fs/block_dev.c:1870 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d427 Code: 48 83 c4 08 48 89 d8 5b 5d c3 66 0f 1f 84 00 00 00 00 00 48 89 e8 48 f7 d8 48 39 c3 0f 92 c0 eb 92 66 90 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 bd b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f3e4dd1b9f8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000020000080 RCX: 000000000045d427 RDX: 00007f3e4dd1bac0 RSI: 0000000000004c04 RDI: 0000000000000004 RBP: 000000000118cf80 R08: 0000000020000098 R09: 0000000000000000 R10: 00000000000001c0 R11: 0000000000000202 R12: 000000000118cf4c R13: 00007ffc342c6d2f R14: 00007f3e4dd1c9c0 R15: 000000000118cf4c ==================================================================