ci2 starts bisection 2023-06-27 14:06:04.842773964 +0000 UTC m=+83983.933121822 bisecting fixing commit since a343b0dd87b42ba9d508fbf7d0c06f744c2e0954 building syzkaller on cf1845599c0bdab59c69518eaa0ecb960ec7ddf0 ensuring issue is reproducible on original commit a343b0dd87b42ba9d508fbf7d0c06f744c2e0954 testing commit a343b0dd87b42ba9d508fbf7d0c06f744c2e0954 gcc compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 8d41dd0365ad2eecfcb1c9535518c45acb55c06d7b5a801c443c54eead48a9a1 all runs: crashed: KASAN: use-after-free Read in gsm_cleanup_mux testing current HEAD e84a4e368abe42cf359fe237f0238820859d5044 testing commit e84a4e368abe42cf359fe237f0238820859d5044 gcc compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 785982627573b487f53be99418690c190bc0b584171d61d34d1b821445f59953 all runs: crashed: KASAN: use-after-free Read in gsm_cleanup_mux crash still not fixed/happens on the oldest tested release revisions tested: 2, total time: 1h4m47.940926145s (build: 57m21.929388152s, test: 6m29.160444029s) crash still not fixed on HEAD or HEAD had kernel test errors commit msg: Linux 6.1.35 crash: KASAN: use-after-free Read in gsm_cleanup_mux ================================================================== BUG: KASAN: use-after-free in gsm_cleanup_mux+0x624/0x6e0 drivers/tty/n_gsm.c:2491 Read of size 4 at addr ffff0000c41f900c by task syz-executor.0/4718 CPU: 1 PID: 4718 Comm: syz-executor.0 Not tainted 6.1.35-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Call trace: dump_backtrace+0x100/0x150 arch/arm64/kernel/stacktrace.c:158 show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x90/0xc8 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x174/0x4c0 mm/kasan/report.c:395 kasan_report+0xd4/0x130 mm/kasan/report.c:495 __asan_report_load4_noabort+0x2c/0x38 mm/kasan/report_generic.c:350 gsm_cleanup_mux+0x624/0x6e0 drivers/tty/n_gsm.c:2491 gsm_config drivers/tty/n_gsm.c:2754 [inline] gsmld_ioctl+0x758/0x159c drivers/tty/n_gsm.c:3117 tty_ioctl+0x56c/0x9b8 drivers/tty/tty_io.c:2782 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0x110/0x14c fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x7c/0x258 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x160/0x1e4 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x54/0x178 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 Allocated by task 4713: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] kmalloc_trace+0x7c/0x94 mm/slab_common.c:1050 kmalloc include/linux/slab.h:553 [inline] kzalloc include/linux/slab.h:689 [inline] gsm_dlci_alloc+0x5c/0x30c drivers/tty/n_gsm.c:2064 gsm_activate_mux+0x28/0x208 drivers/tty/n_gsm.c:2538 gsm_config drivers/tty/n_gsm.c:2778 [inline] gsmld_ioctl+0x8c8/0x159c drivers/tty/n_gsm.c:3117 tty_ioctl+0x56c/0x9b8 drivers/tty/tty_io.c:2782 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0x110/0x14c fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x7c/0x258 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x160/0x1e4 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x54/0x178 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 Freed by task 4713: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516 ____kasan_slab_free+0x144/0x1c0 mm/kasan/common.c:236 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:244 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook mm/slub.c:1750 [inline] slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0x2c0/0x4b4 mm/slub.c:3674 kfree+0xcc/0x1b8 mm/slab_common.c:1007 gsm_dlci_free+0xec/0x134 drivers/tty/n_gsm.c:2110 tty_port_destructor drivers/tty/tty_port.c:296 [inline] kref_put include/linux/kref.h:65 [inline] tty_port_put+0xe4/0x14c drivers/tty/tty_port.c:311 dlci_put drivers/tty/n_gsm.c:2120 [inline] gsm_dlci_release drivers/tty/n_gsm.c:2153 [inline] gsm_cleanup_mux+0x360/0x6e0 drivers/tty/n_gsm.c:2512 gsm_config drivers/tty/n_gsm.c:2754 [inline] gsmld_ioctl+0x758/0x159c drivers/tty/n_gsm.c:3117 tty_ioctl+0x56c/0x9b8 drivers/tty/tty_io.c:2782 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0x110/0x14c fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x7c/0x258 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x160/0x1e4 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x54/0x178 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 The buggy address belongs to the object at ffff0000c41f9000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 12 bytes inside of 2048-byte region [ffff0000c41f9000, ffff0000c41f9800) The buggy address belongs to the physical page: page:00000000ceb99fb8 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1041f8 head:00000000ceb99fb8 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 0000000000000000 dead000000000122 ffff0000c0002900 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000c41f8f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000c41f8f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000c41f9000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000c41f9080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000c41f9100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== list_add corruption. prev is NULL. ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:24! Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 4718 Comm: syz-executor.0 Tainted: G B 6.1.35-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __list_add_valid+0xcc/0x110 lib/list_debug.c:23 lr : __list_add_valid+0xcc/0x110 lib/list_debug.c:23 sp : ffff80001c4278a0 x29: ffff80001c4278a0 x28: 1fffe00018c1ca83 x27: ffff0000c60e5418 x26: ffff0000c60e5410 x25: dfff800000000000 x24: 0000000000000000 x23: 0000000000000000 x22: ffff0000c60e53c8 x21: ffff0000dc66c000 x20: ffff0000dc66c008 x19: ffff0000c60e5000 x18: ffffffffffffffff x17: ffffffffffffffff x16: ffff800010e55424 x15: 0000000000000001 x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000001 x11: 0000000000000002 x10: 0000000000000000 x9 : c5940a29e5499000 x8 : c5940a29e5499000 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff80001c427198 x4 : ffff80001432a5a0 x3 : ffff8000084d2368 x2 : 0000000000000001 x1 : 0000000000000004 x0 : 0000000000000022 Call trace: __list_add_valid+0xcc/0x110 lib/list_debug.c:23 __list_add include/linux/list.h:69 [inline] list_add_tail include/linux/list.h:102 [inline] gsm_send+0x314/0x58c drivers/tty/n_gsm.c:726 gsm_command drivers/tty/n_gsm.c:789 [inline] gsm_dlci_begin_close drivers/tty/n_gsm.c:1933 [inline] gsm_cleanup_mux+0x168/0x6e0 drivers/tty/n_gsm.c:2492 gsm_config drivers/tty/n_gsm.c:2754 [inline] gsmld_ioctl+0x758/0x159c drivers/tty/n_gsm.c:3117 tty_ioctl+0x56c/0x9b8 drivers/tty/tty_io.c:2782 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0x110/0x14c fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x7c/0x258 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x160/0x1e4 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x54/0x178 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 Code: d4210000 f0037aa0 913e8000 95a45590 (d4210000) ---[ end trace 0000000000000000 ]---