ci2 starts bisection 2023-05-20 23:09:25.126874795 +0000 UTC m=+46336.823778635 bisecting cause commit starting from cffbdd825e02688553e52f59f6dd2978f2357a17 building syzkaller on 4bce1a3e705a8b62de8194bdb28f5eef89c8feec ensuring issue is reproducible on original commit cffbdd825e02688553e52f59f6dd2978f2357a17 testing commit cffbdd825e02688553e52f59f6dd2978f2357a17 gcc compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 86df9156df2cbcc3851ec66d634b5597bc2274a9fbcccd697c828f3e2aafe77a all runs: crashed: KASAN: null-ptr-deref Write in __drop_extent_tree testing release v6.1.25 testing commit f17b0ab65d17988d5e6d6fe22f708ef3721080bf gcc compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: f3f86ca910f8a690eec6b56dde0038a64c47a02a9f3a90baeda541f73a00d888 all runs: OK # git bisect start cffbdd825e02688553e52f59f6dd2978f2357a17 f17b0ab65d17988d5e6d6fe22f708ef3721080bf Bisecting: 2804 revisions left to test after this (roughly 12 steps) [e4f264787cc9fbe1280fb4c4ad0e7e0d6a2a899b] Revert "FROMLIST: kbuild: Add dtc flag test" testing commit e4f264787cc9fbe1280fb4c4ad0e7e0d6a2a899b gcc compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: c20eece2e3ad440cfa552b392d9cd8cbc185e571ae011bfdae464ede61a8d7e3 all runs: basic kernel testing failed: UBSAN: object-size-mismatch in wg_xmit # git bisect skip e4f264787cc9fbe1280fb4c4ad0e7e0d6a2a899b Bisecting: 2803 revisions left to test after this (roughly 12 steps) [3b2102a17488ea2188c0050a7a6f467363461f32] ANDROID: db845c_gki.fragment: Enable QCOM_LMH and QCOM_IPCC testing commit 3b2102a17488ea2188c0050a7a6f467363461f32 gcc compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: f49b9466a39b849bee23b0fdad58fdc346422b61b060a5d8617e507201c2b981 all runs: basic kernel testing failed: UBSAN: object-size-mismatch in wg_xmit # git bisect skip 3b2102a17488ea2188c0050a7a6f467363461f32 Bisecting: 2803 revisions left to test after this (roughly 12 steps) [6e048866e5c7eb696a61cfc0e3980a5744edf4df] ANDROID: Add balsini@ to the FUSE OWNERS files testing commit 6e048866e5c7eb696a61cfc0e3980a5744edf4df gcc compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 3cee0cf1ec11f39e77df728e88fc8d6fa644886f36490bccc7b7949a14cda5ca run #0: basic kernel testing failed: UBSAN: object-size-mismatch in send4 run #1: basic kernel testing failed: UBSAN: object-size-mismatch in ip_send_unicast_reply run #2: basic kernel testing failed: UBSAN: object-size-mismatch in send4 run #3: basic kernel testing failed: UBSAN: object-size-mismatch in send4 run #4: basic kernel testing failed: KASAN: use-after-free Read in attach_pid run #5: basic kernel testing failed: UBSAN: object-size-mismatch in send4 run #6: basic kernel testing failed: UBSAN: object-size-mismatch in send4 run #7: basic kernel testing failed: UBSAN: object-size-mismatch in send4 run #8: basic kernel testing failed: KASAN: use-after-free Read in attach_pid run #9: basic kernel testing failed: KASAN: use-after-free Read in attach_pid # git bisect skip 6e048866e5c7eb696a61cfc0e3980a5744edf4df Bisecting: 2803 revisions left to test after this (roughly 12 steps) [3f48f34ca5d1ae44374555bd2fabff361be57a7b] ANDROID: iommu: Add a vendor field in iova_domain testing commit 3f48f34ca5d1ae44374555bd2fabff361be57a7b gcc compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: db0a63a4b37e423be13036ab48f6425529eac7e6b97b69ae3801bcdaa6ddb5a6 all runs: crashed: KASAN: null-ptr-deref Write in __drop_extent_tree # git bisect bad 3f48f34ca5d1ae44374555bd2fabff361be57a7b Bisecting: 2229 revisions left to test after this (roughly 11 steps) [5f339265fd1ad4b1a717ac5b0711113b3cf69afe] FROMLIST: fuse: Introduce passthrough for mmap testing commit 5f339265fd1ad4b1a717ac5b0711113b3cf69afe gcc compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: b690284ab15398face509a6997d80e7503170c934591ca1ec0a0152f5398eb6e run #0: basic kernel testing failed: KASAN: use-after-free Read in attach_pid run #1: basic kernel testing failed: UBSAN: object-size-mismatch in send4 run #2: basic kernel testing failed: KASAN: use-after-free Read in attach_pid run #3: basic kernel testing failed: KASAN: use-after-free Read in attach_pid run #4: basic kernel testing failed: UBSAN: object-size-mismatch in ip_send_unicast_reply run #5: basic kernel testing failed: KASAN: use-after-free Read in attach_pid run #6: basic kernel testing failed: KASAN: use-after-free Read in attach_pid run #7: basic kernel testing failed: KASAN: use-after-free Read in attach_pid run #8: basic kernel testing failed: KASAN: use-after-free Read in attach_pid run #9: basic kernel testing failed: UBSAN: object-size-mismatch in send4 # git bisect skip 5f339265fd1ad4b1a717ac5b0711113b3cf69afe Bisecting: 2229 revisions left to test after this (roughly 11 steps) [fac07550bdac9adea0dbe3edbdbec7a9a690a178] ANDROID: selinux: modify RTM_GETNEIGH{TBL} testing commit fac07550bdac9adea0dbe3edbdbec7a9a690a178 gcc compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 6a1176e8b66f3d09184b267e490ab8144d9b49d0705f671984bf880bbdce1ca4 run #0: basic kernel testing failed: KASAN: use-after-free Read in attach_pid run #1: basic kernel testing failed: KASAN: use-after-free Read in attach_pid run #2: basic kernel testing failed: KASAN: use-after-free Read in attach_pid run #3: basic kernel testing failed: KASAN: use-after-free Read in attach_pid run #4: basic kernel testing failed: KASAN: use-after-free Read in attach_pid run #5: basic kernel testing failed: KASAN: use-after-free Read in attach_pid run #6: basic kernel testing failed: KASAN: use-after-free Read in attach_pid run #7: basic kernel testing failed: UBSAN: object-size-mismatch in send4 run #8: basic kernel testing failed: UBSAN: object-size-mismatch in send4 run #9: basic kernel testing failed: KASAN: use-after-free Read in attach_pid # git bisect skip fac07550bdac9adea0dbe3edbdbec7a9a690a178 Bisecting: 2229 revisions left to test after this (roughly 11 steps) [7fac97c6e6a6fa54b6b9840793959754b5977ebf] Merge 665fe72a7d4f ("Merge tag 'linux-kselftest-kunit-5.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest") into android-mainline testing commit 7fac97c6e6a6fa54b6b9840793959754b5977ebf gcc compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: b0d227abef3744eb7b97b384be5b7267b0afc2ccc70dd333b4c624ffe3a691dd all runs: OK # git bisect good 7fac97c6e6a6fa54b6b9840793959754b5977ebf Bisecting: 351 revisions left to test after this (roughly 9 steps) [3196b641e01ba851ea03120b3a6dda62845de359] ANDROID: KVM: arm64: Add hyp per_cpu variable to track current physical cpu number testing commit 3196b641e01ba851ea03120b3a6dda62845de359 gcc compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 9b88519327fe01f3e2f33fe9ed626181fce18986432582d2e03a1a92f0f6514d all runs: OK # git bisect good 3196b641e01ba851ea03120b3a6dda62845de359 Bisecting: 175 revisions left to test after this (roughly 8 steps) [e3262b342c7dead031ac7c5792a8a358cffa7ab8] ANDROID: KVM: arm64: s2mpu: S2MPU V9 code testing commit e3262b342c7dead031ac7c5792a8a358cffa7ab8 gcc compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 83f5cfc009577ef062d8feebc61367a34706747f9def9ac8cb08eba545614582 all runs: OK # git bisect good e3262b342c7dead031ac7c5792a8a358cffa7ab8 Bisecting: 94 revisions left to test after this (roughly 7 steps) [628815291f91af92bb6fc9339359daad8f48f72c] f2fs: let's avoid panic if extent_tree is not created testing commit 628815291f91af92bb6fc9339359daad8f48f72c gcc compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 5847ceae4b4cfc13985431f2c8a057edb0595c21b536c43e8c4c145017716c6a all runs: crashed: KASAN: null-ptr-deref Write in __drop_extent_tree # git bisect bad 628815291f91af92bb6fc9339359daad8f48f72c Bisecting: 39 revisions left to test after this (roughly 5 steps) [9cd485417ad37039a807bbb5e69ad9317f419e29] f2fs: truncate blocks in batch in __complete_revoke_list() testing commit 9cd485417ad37039a807bbb5e69ad9317f419e29 gcc compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: fa7c437c43b508a56146ecfe21756d1c72d9ee5ef8fdde33c9dd13af0ec40446 all runs: OK # git bisect good 9cd485417ad37039a807bbb5e69ad9317f419e29 Bisecting: 19 revisions left to test after this (roughly 4 steps) [9d44110b4c4decd062548bc9bbad7ccadace16d7] f2fs: don't call f2fs_issue_discard_timeout() when discard_cmd_cnt is 0 in f2fs_put_super() testing commit 9d44110b4c4decd062548bc9bbad7ccadace16d7 gcc compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: b523bd4d69bac5b82404912f2087582dd81eedba63f5745c0f6918ae9a5ed97a all runs: crashed: KASAN: null-ptr-deref Write in __drop_extent_tree # git bisect bad 9d44110b4c4decd062548bc9bbad7ccadace16d7 Bisecting: 9 revisions left to test after this (roughly 3 steps) [71f36b65b9ad1fd0e94b4a89adaf7e1695390ea6] f2fs: remove F2FS_SET_FEATURE() and F2FS_CLEAR_FEATURE() macro testing commit 71f36b65b9ad1fd0e94b4a89adaf7e1695390ea6 gcc compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 6da6fe56a55285db1f8398bc32346c44c26629434633e5cdaf69d000be3181cd all runs: OK # git bisect good 71f36b65b9ad1fd0e94b4a89adaf7e1695390ea6 Bisecting: 4 revisions left to test after this (roughly 2 steps) [62488df1b92d4730f2270c73fcc26c72b56e2901] f2fs: refactor extent_cache to support for read and more testing commit 62488df1b92d4730f2270c73fcc26c72b56e2901 gcc compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 66c8f7bfabeaf95ccfea7674fe1a40eafe972822ffa1e39f1513b702371446af all runs: OK # git bisect good 62488df1b92d4730f2270c73fcc26c72b56e2901 Bisecting: 2 revisions left to test after this (roughly 1 step) [62ee04f1fd03e7410ff555e4d95de4f4b22c9b7e] f2fs: add block_age-based extent cache testing commit 62ee04f1fd03e7410ff555e4d95de4f4b22c9b7e gcc compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: abc3552e187b0c672299d1820e4f34ef8b16a5e54c827c70941a4039b183ea09 all runs: crashed: KASAN: null-ptr-deref Write in __drop_extent_tree # git bisect bad 62ee04f1fd03e7410ff555e4d95de4f4b22c9b7e Bisecting: 0 revisions left to test after this (roughly 0 steps) [5ce7de6415c02b5d02731c7b2f27ba10ad566c1a] f2fs: allocate the extent_cache by default testing commit 5ce7de6415c02b5d02731c7b2f27ba10ad566c1a gcc compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 64522068ed59cbb9fa0cb2b2488c1ccee4226f23df0e5af3e97cb5b13312d735 all runs: crashed: KASAN: null-ptr-deref Write in f2fs_drop_extent_tree # git bisect bad 5ce7de6415c02b5d02731c7b2f27ba10ad566c1a 5ce7de6415c02b5d02731c7b2f27ba10ad566c1a is the first bad commit commit 5ce7de6415c02b5d02731c7b2f27ba10ad566c1a Author: Jaegeuk Kim Date: Fri Dec 2 13:51:09 2022 -0800 f2fs: allocate the extent_cache by default Let's allocate it to remove the runtime complexity. Signed-off-by: Jaegeuk Kim fs/f2fs/extent_cache.c | 38 +++++++++++++++++++------------------- fs/f2fs/f2fs.h | 3 ++- fs/f2fs/inode.c | 6 ++++-- fs/f2fs/namei.c | 4 ++-- 4 files changed, 27 insertions(+), 24 deletions(-) culprit signature: 64522068ed59cbb9fa0cb2b2488c1ccee4226f23df0e5af3e97cb5b13312d735 parent signature: 66c8f7bfabeaf95ccfea7674fe1a40eafe972822ffa1e39f1513b702371446af revisions tested: 18, total time: 8h42m22.215247302s (build: 6h12m47.520552621s, test: 2h23m32.756531921s) first bad commit: 5ce7de6415c02b5d02731c7b2f27ba10ad566c1a f2fs: allocate the extent_cache by default recipients (to): ["jaegeuk@kernel.org"] recipients (cc): [] crash: KASAN: null-ptr-deref Write in f2fs_drop_extent_tree ================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:102 [inline] BUG: KASAN: null-ptr-deref in atomic_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:541 [inline] BUG: KASAN: null-ptr-deref in queued_write_lock include/asm-generic/qrwlock.h:98 [inline] BUG: KASAN: null-ptr-deref in __raw_write_lock include/linux/rwlock_api_smp.h:210 [inline] BUG: KASAN: null-ptr-deref in _raw_write_lock+0x97/0x170 kernel/locking/spinlock.c:300 Write of size 4 at addr 0000000000000030 by task syz-executor.0/8443 CPU: 1 PID: 8443 Comm: syz-executor.0 Not tainted 6.1.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x105/0x148 lib/dump_stack.c:106 print_report+0xe1/0x4e0 mm/kasan/report.c:398 kasan_report+0x13c/0x170 mm/kasan/report.c:495 kasan_check_range+0x294/0x2a0 mm/kasan/generic.c:189 __kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37 instrument_atomic_read_write include/linux/instrumented.h:102 [inline] atomic_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:541 [inline] queued_write_lock include/asm-generic/qrwlock.h:98 [inline] __raw_write_lock include/linux/rwlock_api_smp.h:210 [inline] _raw_write_lock+0x97/0x170 kernel/locking/spinlock.c:300 __drop_extent_tree fs/f2fs/extent_cache.c:974 [inline] f2fs_drop_extent_tree+0x1c1/0x3f0 fs/f2fs/extent_cache.c:990 f2fs_insert_range+0x339/0x450 fs/f2fs/file.c:1666 f2fs_fallocate+0x309/0x500 fs/f2fs/file.c:1840 vfs_fallocate+0x330/0x410 fs/open.c:323 ksys_fallocate fs/open.c:346 [inline] __do_sys_fallocate fs/open.c:354 [inline] __se_sys_fallocate fs/open.c:352 [inline] __x64_sys_fallocate+0xb3/0xe0 fs/open.c:352 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fbbaf28c169 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:00007fbbb00cb168 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007fbbaf3abf80 RCX: 00007fbbaf28c169 RDX: 0000000000000000 RSI: 0000000000000020 RDI: 0000000000000005 RBP: 00007fbbaf2e7ca1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000010000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe2418685f R14: 00007fbbb00cb300 R15: 0000000000022000 ================================================================== BUG: kernel NULL pointer dereference, address: 0000000000000030 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 1268db067 P4D 1268db067 PUD 113d28067 PMD 0 Oops: 0002 [#1] PREEMPT SMP KASAN CPU: 1 PID: 8443 Comm: syz-executor.0 Tainted: G B 6.1.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023 RIP: 0010:atomic_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:543 [inline] RIP: 0010:queued_write_lock include/asm-generic/qrwlock.h:98 [inline] RIP: 0010:__raw_write_lock include/linux/rwlock_api_smp.h:210 [inline] RIP: 0010:_raw_write_lock+0xb6/0x170 kernel/locking/spinlock.c:300 Code: ef be 04 00 00 00 e8 89 4c 1a fd 4c 89 ff be 04 00 00 00 e8 7c 4c 1a fd 43 0f b6 04 26 84 c0 75 7d 8b 44 24 20 b9 ff 00 00 00 41 0f b1 4d 00 75 33 48 c7 04 24 0e 36 e0 45 49 c7 04 1c 00 00 RSP: 0018:ffffc90002047be0 EFLAGS: 00010297 RAX: 0000000000000000 RBX: 1ffff92000408f7c RCX: 00000000000000ff RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc90002047c00 RBP: ffffc90002047c70 R08: dffffc0000000000 R09: 0000000000000003 R10: ffffffffffffffff R11: dffffc0000000001 R12: dffffc0000000000 R13: 0000000000000030 R14: 1ffff92000408f80 R15: ffffc90002047c00 FS: 00007fbbb00cb700(0000) GS:ffff8881f7300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000030 CR3: 0000000113a48000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __drop_extent_tree fs/f2fs/extent_cache.c:974 [inline] f2fs_drop_extent_tree+0x1c1/0x3f0 fs/f2fs/extent_cache.c:990 f2fs_insert_range+0x339/0x450 fs/f2fs/file.c:1666 f2fs_fallocate+0x309/0x500 fs/f2fs/file.c:1840 vfs_fallocate+0x330/0x410 fs/open.c:323 ksys_fallocate fs/open.c:346 [inline] __do_sys_fallocate fs/open.c:354 [inline] __se_sys_fallocate fs/open.c:352 [inline] __x64_sys_fallocate+0xb3/0xe0 fs/open.c:352 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fbbaf28c169 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:00007fbbb00cb168 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007fbbaf3abf80 RCX: 00007fbbaf28c169 RDX: 0000000000000000 RSI: 0000000000000020 RDI: 0000000000000005 RBP: 00007fbbaf2e7ca1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000010000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe2418685f R14: 00007fbbb00cb300 R15: 0000000000022000 Modules linked in: CR2: 0000000000000030 ---[ end trace 0000000000000000 ]--- RIP: 0010:atomic_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:543 [inline] RIP: 0010:queued_write_lock include/asm-generic/qrwlock.h:98 [inline] RIP: 0010:__raw_write_lock include/linux/rwlock_api_smp.h:210 [inline] RIP: 0010:_raw_write_lock+0xb6/0x170 kernel/locking/spinlock.c:300 Code: ef be 04 00 00 00 e8 89 4c 1a fd 4c 89 ff be 04 00 00 00 e8 7c 4c 1a fd 43 0f b6 04 26 84 c0 75 7d 8b 44 24 20 b9 ff 00 00 00 41 0f b1 4d 00 75 33 48 c7 04 24 0e 36 e0 45 49 c7 04 1c 00 00 RSP: 0018:ffffc90002047be0 EFLAGS: 00010297 RAX: 0000000000000000 RBX: 1ffff92000408f7c RCX: 00000000000000ff RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc90002047c00 RBP: ffffc90002047c70 R08: dffffc0000000000 R09: 0000000000000003 R10: ffffffffffffffff R11: dffffc0000000001 R12: dffffc0000000000 R13: 0000000000000030 R14: 1ffff92000408f80 R15: ffffc90002047c00 FS: 00007fbbb00cb700(0000) GS:ffff8881f7300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000030 CR3: 0000000113a48000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: ef out %eax,(%dx) 1: be 04 00 00 00 mov $0x4,%esi 6: e8 89 4c 1a fd callq 0xfd1a4c94 b: 4c 89 ff mov %r15,%rdi e: be 04 00 00 00 mov $0x4,%esi 13: e8 7c 4c 1a fd callq 0xfd1a4c94 18: 43 0f b6 04 26 movzbl (%r14,%r12,1),%eax 1d: 84 c0 test %al,%al 1f: 75 7d jne 0x9e 21: 8b 44 24 20 mov 0x20(%rsp),%eax 25: b9 ff 00 00 00 mov $0xff,%ecx * 2a: f0 41 0f b1 4d 00 lock cmpxchg %ecx,0x0(%r13) <-- trapping instruction 30: 75 33 jne 0x65 32: 48 c7 04 24 0e 36 e0 movq $0x45e0360e,(%rsp) 39: 45 3a: 49 rex.WB 3b: c7 .byte 0xc7 3c: 04 1c add $0x1c,%al