bisecting cause commit starting from a4ccb5f9dc6c4fb4d4c0a9d73a911986f20ec88a building syzkaller on d28f4ce564ffeacac8c8c75085be79d9c99e2bbf testing commit a4ccb5f9dc6c4fb4d4c0a9d73a911986f20ec88a with gcc (GCC) 8.1.0 run #0: crashed: KASAN: use-after-free Read in add_uevent_var run #1: crashed: KASAN: use-after-free Read in add_uevent_var run #2: crashed: KASAN: use-after-free Read in add_uevent_var run #3: crashed: WARNING: refcount bug in kobject_get run #4: crashed: KASAN: use-after-free Read in add_uevent_var testing release v5.0 testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.1.0 run #0: crashed: KASAN: use-after-free Read in add_uevent_var run #1: crashed: KASAN: use-after-free Read in add_uevent_var run #2: crashed: WARNING: refcount bug in kobject_get run #3: crashed: KASAN: use-after-free Read in add_uevent_var run #4: crashed: KASAN: use-after-free Read in add_uevent_var testing release v4.20 testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0 run #0: crashed: WARNING: refcount bug in corrupted run #1: crashed: KASAN: use-after-free Read in add_uevent_var run #2: crashed: WARNING: refcount bug in kobject_get run #3: crashed: WARNING: refcount bug in kobject_get run #4: crashed: KASAN: use-after-free Read in add_uevent_var testing release v4.19 testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0 all runs: crashed: KASAN: use-after-free Read in add_uevent_var testing release v4.18 testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.1.0 run #0: crashed: KASAN: use-after-free Read in add_uevent_var run #1: crashed: WARNING: refcount bug in kobject_get run #2: crashed: WARNING: refcount bug in corrupted run #3: crashed: KASAN: use-after-free Read in add_uevent_var run #4: crashed: KASAN: use-after-free Read in add_uevent_var testing release v4.17 testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.1.0 run #0: crashed: KASAN: use-after-free Read in add_uevent_var run #1: crashed: KASAN: use-after-free Read in add_uevent_var run #2: crashed: KASAN: use-after-free Read in add_uevent_var run #3: crashed: WARNING: refcount bug in kobject_get run #4: crashed: KASAN: use-after-free Read in add_uevent_var testing release v4.16 testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0 run #0: crashed: KASAN: use-after-free Read in add_uevent_var run #1: crashed: KASAN: use-after-free Read in add_uevent_var run #2: crashed: KASAN: use-after-free Read in add_uevent_var run #3: crashed: WARNING: refcount bug in kobject_get run #4: crashed: KASAN: use-after-free Read in add_uevent_var testing release v4.15 testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.1.0 all runs: crashed: KASAN: use-after-free Read in add_uevent_var testing release v4.14 testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.1.0 run #0: crashed: KASAN: use-after-free Read in add_uevent_var run #1: OK run #2: OK run #3: OK run #4: OK testing release v4.13 testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0 all runs: OK # git bisect start v4.14 v4.13 Bisecting: 7300 revisions left to test after this (roughly 13 steps) [15d8ffc96464f6571ecf22043c45fad659f11bdd] Merge tag 'mmc-v4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc testing commit 15d8ffc96464f6571ecf22043c45fad659f11bdd with gcc (GCC) 8.1.0 all runs: OK # git bisect good 15d8ffc96464f6571ecf22043c45fad659f11bdd Bisecting: 3465 revisions left to test after this (roughly 12 steps) [e90937e756938f03d37d4cae7c82316a3a425944] Merge tag 'armsoc-devicetree' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc testing commit e90937e756938f03d37d4cae7c82316a3a425944 with gcc (GCC) 8.1.0 run #0: crashed: KASAN: use-after-free Read in add_uevent_var run #1: crashed: KASAN: use-after-free Read in add_uevent_var run #2: OK run #3: OK run #4: OK # git bisect bad e90937e756938f03d37d4cae7c82316a3a425944 Bisecting: 1917 revisions left to test after this (roughly 11 steps) [fd1d362600e2d2edb6262d8e05661424c1a315bf] ARM: implement memset32 & memset64 testing commit fd1d362600e2d2edb6262d8e05661424c1a315bf with gcc (GCC) 8.1.0 all runs: OK # git bisect good fd1d362600e2d2edb6262d8e05661424c1a315bf Bisecting: 972 revisions left to test after this (roughly 10 steps) [a59e57da49f7c3f3de8cf4b7568a0c6c82f5b242] Merge tag 'for-linus-20170904' of git://git.infradead.org/linux-mtd testing commit a59e57da49f7c3f3de8cf4b7568a0c6c82f5b242 with gcc (GCC) 8.1.0 run #0: crashed: WARNING: refcount bug in kobject_get run #1: OK run #2: OK run #3: OK run #4: OK # git bisect bad a59e57da49f7c3f3de8cf4b7568a0c6c82f5b242 Bisecting: 485 revisions left to test after this (roughly 9 steps) [fbf4432ff71b7a25bef993a5312906946d27f446] Merge branch 'akpm' (patches from Andrew) testing commit fbf4432ff71b7a25bef993a5312906946d27f446 with gcc (GCC) 8.1.0 all runs: OK # git bisect good fbf4432ff71b7a25bef993a5312906946d27f446 Bisecting: 243 revisions left to test after this (roughly 8 steps) [66ba772ee3119849fcdd8ac9766c6c25ede4a982] Merge branch 'for-4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux testing commit 66ba772ee3119849fcdd8ac9766c6c25ede4a982 with gcc (GCC) 8.1.0 all runs: OK # git bisect good 66ba772ee3119849fcdd8ac9766c6c25ede4a982 Bisecting: 120 revisions left to test after this (roughly 7 steps) [7151202b64c8c5eb163e41fa0adcb8239eea64aa] Merge tag 'rpmsg-v4.14' of git://github.com/andersson/remoteproc testing commit 7151202b64c8c5eb163e41fa0adcb8239eea64aa with gcc (GCC) 8.1.0 run #0: crashed: KASAN: use-after-free Read in add_uevent_var run #1: crashed: KASAN: use-after-free Read in add_uevent_var run #2: OK run #3: OK run #4: OK # git bisect bad 7151202b64c8c5eb163e41fa0adcb8239eea64aa Bisecting: 54 revisions left to test after this (roughly 6 steps) [d2d8f51e28fec278e9632cdd029facf813f579a3] Merge branch 'i2c/for-4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux testing commit d2d8f51e28fec278e9632cdd029facf813f579a3 with gcc (GCC) 8.1.0 run #0: crashed: WARNING: refcount bug in kobject_get run #1: OK run #2: OK run #3: OK run #4: OK # git bisect bad d2d8f51e28fec278e9632cdd029facf813f579a3 Bisecting: 33 revisions left to test after this (roughly 5 steps) [c50b2e9379df66eadc1b8b780dd4c287aba8da8f] dt-bindings: i2c: Add MediaTek MT7622 i2c binding testing commit c50b2e9379df66eadc1b8b780dd4c287aba8da8f with gcc (GCC) 8.1.0 run #0: crashed: KASAN: use-after-free Read in add_uevent_var run #1: crashed: KASAN: use-after-free Read in add_uevent_var run #2: OK run #3: OK run #4: OK # git bisect bad c50b2e9379df66eadc1b8b780dd4c287aba8da8f Bisecting: 16 revisions left to test after this (roughly 4 steps) [87b59ff8d1d9d809c014a4e20bc043064b6e0047] i2c: aspeed: add proper support fo 24xx clock params testing commit 87b59ff8d1d9d809c014a4e20bc043064b6e0047 with gcc (GCC) 8.1.0 run #0: crashed: KASAN: use-after-free Read in add_uevent_var run #1: OK run #2: OK run #3: OK run #4: OK # git bisect bad 87b59ff8d1d9d809c014a4e20bc043064b6e0047 Bisecting: 8 revisions left to test after this (roughly 3 steps) [0dbb9634e5355a27f4f25d0ceb3ed4ab2c8d17a5] i2c: rk3x: add support for rv1108 testing commit 0dbb9634e5355a27f4f25d0ceb3ed4ab2c8d17a5 with gcc (GCC) 8.1.0 all runs: OK # git bisect good 0dbb9634e5355a27f4f25d0ceb3ed4ab2c8d17a5 Bisecting: 4 revisions left to test after this (roughly 2 steps) [17a924bfe0af0f74625c19a41807e963a4f06936] i2c-cht-wc: Add Intel Cherry Trail Whiskey Cove SMBUS controller driver testing commit 17a924bfe0af0f74625c19a41807e963a4f06936 with gcc (GCC) 8.1.0 run #0: crashed: WARNING: refcount bug in kobject_get run #1: crashed: KASAN: use-after-free Read in add_uevent_var run #2: OK run #3: OK run #4: OK # git bisect bad 17a924bfe0af0f74625c19a41807e963a4f06936 Bisecting: 1 revision left to test after this (roughly 1 step) [6c448f04c83713c49be7baf341ed6a04d7493a15] dt-bindings: i2c: sh_mobile: Document r8a7743/5 support testing commit 6c448f04c83713c49be7baf341ed6a04d7493a15 with gcc (GCC) 8.1.0 all runs: OK # git bisect good 6c448f04c83713c49be7baf341ed6a04d7493a15 Bisecting: 0 revisions left to test after this (roughly 0 steps) [0a1c7959acd9674a0e4e59f911f3e5fbf25fd693] gpu: drm: tc35876x: move header file out of I2C realm testing commit 0a1c7959acd9674a0e4e59f911f3e5fbf25fd693 with gcc (GCC) 8.1.0 run #0: crashed: WARNING: refcount bug in kobject_get run #1: crashed: KASAN: use-after-free Read in add_uevent_var run #2: OK run #3: OK run #4: OK # git bisect bad 0a1c7959acd9674a0e4e59f911f3e5fbf25fd693 0a1c7959acd9674a0e4e59f911f3e5fbf25fd693 is the first bad commit commit 0a1c7959acd9674a0e4e59f911f3e5fbf25fd693 Author: Wolfram Sang Date: Wed May 17 17:22:18 2017 +0200 gpu: drm: tc35876x: move header file out of I2C realm include/linux/i2c is not for client devices. Move the header file to a more appropriate location. Signed-off-by: Wolfram Sang Acked-by: Patrik Jakobsson :040000 040000 b8e06448829aae07fa56c34cea412135c31f4099 5fea68980228a7d1de222778470eae6eff28140a M arch :040000 040000 c865247b459538f7fa3cbbc544dc2eeb97c45ae7 5c241c85d3e2eb19d79cc6c0fb9e766b51786548 M drivers :040000 040000 caa5c9678a7150aa64baf744b23f22352332d999 fe447649ad022f7d840dc53147bfa59b22553596 M include revisions tested: 24, total time: 6h10m4.074693839s (build: 2h11m43.681274089s, test: 3h49m43.988812027s) first bad commit: 0a1c7959acd9674a0e4e59f911f3e5fbf25fd693 gpu: drm: tc35876x: move header file out of I2C realm cc: ["airlied@linux.ie" "dri-devel@lists.freedesktop.org" "hpa@zytor.com" "linux-kernel@vger.kernel.org" "mingo@redhat.com" "patrik.r.jakobsson@gmail.com" "tglx@linutronix.de" "wsa@the-dreams.de" "x86@kernel.org"] crash: KASAN: use-after-free Read in add_uevent_var RDX: 0000000000000000 RSI: 00000000080daf20 RDI: 00000000080f0f84 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ================================================================== BUG: KASAN: use-after-free in string+0x2ea/0x310 lib/vsprintf.c:593 Read of size 1 at addr ffff88011e55df40 by task syz-executor064/13761 CPU: 0 PID: 13761 Comm: syz-executor064 Not tainted 4.13.0-rc3+ #1 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x145/0x1e1 lib/dump_stack.c:52 print_address_description.cold.7+0x9/0x1c9 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report.cold.8+0x121/0x2da mm/kasan/report.c:408 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:426 string+0x2ea/0x310 lib/vsprintf.c:593 vsnprintf+0x392/0x1820 lib/vsprintf.c:2184 add_uevent_var+0x11b/0x280 lib/kobject_uevent.c:538 input_dev_uevent+0x13f/0x6b0 drivers/input/input.c:1592 dev_uevent+0x2a0/0x700 drivers/base/core.c:922 kobject_uevent_env+0x3b1/0x9eb lib/kobject_uevent.c:401 kobject_uevent+0xb/0xd lib/kobject_uevent.c:515 kobject_cleanup lib/kobject.c:635 [inline] kobject_release lib/kobject.c:677 [inline] kref_put include/linux/kref.h:70 [inline] kobject_put.cold.10+0x147/0x2aa lib/kobject.c:694 put_device+0x12/0x20 drivers/base/core.c:1799 input_put_device include/linux/input.h:345 [inline] evdev_free+0x45/0x60 drivers/input/evdev.c:363 device_release+0x71/0x170 drivers/base/core.c:810 kobject_cleanup lib/kobject.c:648 [inline] kobject_release lib/kobject.c:677 [inline] kref_put include/linux/kref.h:70 [inline] kobject_put.cold.10+0x22a/0x2aa lib/kobject.c:694 cdev_default_release+0x39/0x50 fs/char_dev.c:582 kobject_cleanup lib/kobject.c:648 [inline] kobject_release lib/kobject.c:677 [inline] kref_put include/linux/kref.h:70 [inline] kobject_put.cold.10+0x22a/0x2aa lib/kobject.c:694 cdev_put.part.0+0x31/0x50 fs/char_dev.c:343 cdev_put+0xe/0x20 fs/char_dev.c:340 __fput+0x67a/0x900 fs/file_table.c:214 ____fput+0x9/0x10 fs/file_table.c:246 task_work_run+0x14e/0x230 kernel/task_work.c:116 exit_task_work include/linux/task_work.h:21 [inline] do_exit+0xca2/0x17d0 kernel/exit.c:865 do_group_exit+0x135/0x3b0 kernel/exit.c:969 SYSC_exit_group kernel/exit.c:980 [inline] SyS_exit_group+0x18/0x20 kernel/exit.c:978 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] do_fast_syscall_32+0x3cb/0xd95 arch/x86/entry/common.c:388 entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:124 RIP: 0023:0xf7f29ca9 RSP: 002b:00000000ffa67bbc EFLAGS: 00000296 ORIG_RAX: 00000000000000fc RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000080f1298 RDX: 0000000000000000 RSI: 00000000080daf1c RDI: 00000000080f12a0 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 13761: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:551 __do_kmalloc mm/slab.c:3725 [inline] __kmalloc_track_caller+0x143/0x7a0 mm/slab.c:3740 kstrndup+0x3c/0xc0 mm/util.c:98 uinput_dev_setup+0x1d1/0x330 drivers/input/misc/uinput.c:416 uinput_ioctl_handler.isra.10+0x10f1/0x1c10 drivers/input/misc/uinput.c:825 uinput_compat_ioctl+0x47/0x70 drivers/input/misc/uinput.c:1001 C_SYSC_ioctl fs/compat_ioctl.c:1595 [inline] compat_SyS_ioctl+0x148/0x2c90 fs/compat_ioctl.c:1542 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] do_fast_syscall_32+0x3cb/0xd95 arch/x86/entry/common.c:388 entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:124 Freed by task 13761: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3503 [inline] kfree+0xcc/0x270 mm/slab.c:3820 uinput_destroy_device+0xd0/0x1f0 drivers/input/misc/uinput.c:250 uinput_ioctl_handler.isra.10+0x110b/0x1c10 drivers/input/misc/uinput.c:821 uinput_compat_ioctl+0x47/0x70 drivers/input/misc/uinput.c:1001 C_SYSC_ioctl fs/compat_ioctl.c:1595 [inline] compat_SyS_ioctl+0x148/0x2c90 fs/compat_ioctl.c:1542 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] do_fast_syscall_32+0x3cb/0xd95 arch/x86/entry/common.c:388 entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:124 The buggy address belongs to the object at ffff88011e55df40 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 0 bytes inside of 32-byte region [ffff88011e55df40, ffff88011e55df60) The buggy address belongs to the page: page:ffffea0004795740 count:1 mapcount:0 mapping:ffff88011e55d000 index:0xffff88011e55dfc1 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffff88011e55d000 ffff88011e55dfc1 000000010000002d raw: ffffea000479b760 ffffea00045b2da0 ffff88012bc001c0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88011e55de00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff88011e55de80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc >ffff88011e55df00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ^ ffff88011e55df80: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc ffff88011e55e000: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ==================================================================