ci starts bisection 2023-01-31 06:00:52.602143781 +0000 UTC m=+730166.548205839 bisecting fixing commit since 1b929c02afd37871d5afb9d498426f83432e71c2 building syzkaller on 44712fbc6b687170984c3562336a415b56d82607 ensuring issue is reproducible on original commit 1b929c02afd37871d5afb9d498426f83432e71c2 testing commit 1b929c02afd37871d5afb9d498426f83432e71c2 gcc compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 27ccc7db394d70ccc9b77118549f25c7988e26883dd80577bf03493384f5f51e all runs: crashed: KASAN: use-after-free Read in gsm_cleanup_mux testing current HEAD c0b67534c95c537f7a506a06b98e5e85d72e2b7d testing commit c0b67534c95c537f7a506a06b98e5e85d72e2b7d gcc compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 34ed6068b37b5d6a594cf6618a84d1f7f69b3f298fee36a91546032f319020a3 all runs: crashed: KASAN: use-after-free Read in gsm_cleanup_mux revisions tested: 2, total time: 27m25.469253619s (build: 20m23.952018009s, test: 6m18.379327942s) the crash still happens on HEAD commit msg: Merge tag 'cgroup-for-6.2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup crash: KASAN: use-after-free Read in gsm_cleanup_mux ================================================================== BUG: KASAN: use-after-free in gsm_cleanup_mux+0x6a5/0x730 drivers/tty/n_gsm.c:2833 Read of size 4 at addr ffff888016abc00c by task syz-executor.0/5947 CPU: 1 PID: 5947 Comm: syz-executor.0 Not tainted 6.2.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x5b/0x81 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:306 [inline] print_report+0x15e/0x45d mm/kasan/report.c:417 kasan_report+0xbf/0x1f0 mm/kasan/report.c:517 gsm_cleanup_mux+0x6a5/0x730 drivers/tty/n_gsm.c:2833 gsm_config drivers/tty/n_gsm.c:3104 [inline] gsmld_ioctl+0x3bb/0x1100 drivers/tty/n_gsm.c:3471 tty_ioctl+0x6fa/0x1250 drivers/tty/tty_io.c:2784 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x123/0x190 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f4c9488c0a9 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:00007f4c95506168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f4c949ac050 RCX: 00007f4c9488c0a9 RDX: 0000000020000040 RSI: 00000000404c4701 RDI: 0000000000000005 RBP: 00007f4c948e7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd63bdc65f R14: 00007f4c95506300 R15: 0000000000022000 Allocated by task 5944: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] ____kasan_kmalloc mm/kasan/common.c:330 [inline] __kasan_kmalloc+0xa5/0xb0 mm/kasan/common.c:380 kmalloc include/linux/slab.h:580 [inline] kzalloc include/linux/slab.h:720 [inline] gsm_dlci_alloc+0x41/0x790 drivers/tty/n_gsm.c:2399 gsm_activate_mux drivers/tty/n_gsm.c:2880 [inline] gsm_config drivers/tty/n_gsm.c:3132 [inline] gsmld_ioctl+0x682/0x1100 drivers/tty/n_gsm.c:3471 tty_ioctl+0x6fa/0x1250 drivers/tty/tty_io.c:2784 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x123/0x190 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 5944: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:518 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807 slab_free mm/slub.c:3787 [inline] __kmem_cache_free+0xaf/0x3b0 mm/slub.c:3800 dlci_put drivers/tty/n_gsm.c:2462 [inline] gsm_dlci_release drivers/tty/n_gsm.c:2495 [inline] gsm_cleanup_mux+0x2b7/0x730 drivers/tty/n_gsm.c:2854 gsm_config drivers/tty/n_gsm.c:3104 [inline] gsmld_ioctl+0x3bb/0x1100 drivers/tty/n_gsm.c:3471 tty_ioctl+0x6fa/0x1250 drivers/tty/tty_io.c:2784 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x123/0x190 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Last potentially related work creation: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:488 __call_rcu_common.constprop.0+0x99/0x820 kernel/rcu/tree.c:2755 netlink_release+0xacb/0x1810 net/netlink/af_netlink.c:828 __sock_release+0xbb/0x270 net/socket.c:650 sock_close+0x13/0x20 net/socket.c:1365 __fput+0x1fa/0x9a0 fs/file_table.c:320 task_work_run+0x12f/0x220 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888016abc000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 12 bytes inside of 2048-byte region [ffff888016abc000, ffff888016abc800) The buggy address belongs to the physical page: page:ffffea00005aae00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x16ab8 head:ffffea00005aae00 order:3 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff888011442000 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 1631629675, free_ts 0 prep_new_page mm/page_alloc.c:2531 [inline] get_page_from_freelist+0x119c/0x2ce0 mm/page_alloc.c:4283 __alloc_pages+0x1cb/0x5b0 mm/page_alloc.c:5549 alloc_page_interleave+0xf/0x1c0 mm/mempolicy.c:2119 alloc_slab_page mm/slub.c:1851 [inline] allocate_slab+0x25f/0x350 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3193 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3292 __slab_alloc_node mm/slub.c:3345 [inline] slab_alloc_node mm/slub.c:3442 [inline] __kmem_cache_alloc_node+0x1a4/0x430 mm/slub.c:3491 kmalloc_trace+0x26/0x60 mm/slab_common.c:1062 kmalloc include/linux/slab.h:580 [inline] kzalloc include/linux/slab.h:720 [inline] acpi_os_allocate_zeroed include/acpi/platform/aclinuxex.h:57 [inline] acpi_ds_create_walk_state+0x78/0x1e0 drivers/acpi/acpica/dswstate.c:518 acpi_ds_call_control_method+0xc2/0x4fe drivers/acpi/acpica/dsmethod.c:498 acpi_ps_parse_aml+0x26e/0x6fe drivers/acpi/acpica/psparse.c:503 acpi_ps_execute_method+0x51e/0x57a drivers/acpi/acpica/psxface.c:190 acpi_ns_evaluate+0x64f/0x889 drivers/acpi/acpica/nseval.c:205 acpi_ut_evaluate_object+0xe1/0x330 drivers/acpi/acpica/uteval.c:60 acpi_rs_get_method_data+0x69/0xb9 drivers/acpi/acpica/rsutils.c:650 acpi_walk_resources drivers/acpi/acpica/rsxface.c:616 [inline] acpi_walk_resources+0xf2/0x148 drivers/acpi/acpica/rsxface.c:594 page_owner free stack trace missing Memory state around the buggy address: ffff888016abbf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888016abbf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888016abc000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888016abc080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888016abc100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================