bisecting fixing commit since a03957ab0fd5d7d03b512a72ab9106a1749f556e building syzkaller on 1bfa09b9672821334a7ed926244ebc39910b84f4 testing commit a03957ab0fd5d7d03b512a72ab9106a1749f556e with gcc (GCC) 8.1.0 kernel signature: 6a829614ca278cab371b3a024c7d9e9ecfacc3d7d7bfd33d84af407bda0ffc5a run #0: crashed: general protection fault in flex_array_get run #1: crashed: general protection fault in corrupted run #2: crashed: general protection fault in flex_array_get run #3: crashed: general protection fault in flex_array_get run #4: crashed: general protection fault in flex_array_get run #5: crashed: general protection fault in flex_array_get run #6: crashed: general protection fault in flex_array_get run #7: crashed: general protection fault in flex_array_get run #8: crashed: general protection fault in flex_array_get run #9: crashed: general protection fault in flex_array_get testing current HEAD dce0f88600e49746b4bda873965b671a23ff4313 testing commit dce0f88600e49746b4bda873965b671a23ff4313 with gcc (GCC) 8.1.0 kernel signature: 8cfc4388735c6a2082b277c814a6de4e1066da40d8048fb6cad1b1c8cc85f393 run #0: crashed: general protection fault in flex_array_get run #1: crashed: general protection fault in flex_array_get run #2: crashed: general protection fault in flex_array_get run #3: crashed: general protection fault in flex_array_get run #4: crashed: general protection fault in flex_array_get run #5: crashed: general protection fault in flex_array_get run #6: crashed: general protection fault in flex_array_get run #7: crashed: general protection fault in corrupted run #8: crashed: general protection fault in corrupted run #9: crashed: general protection fault in flex_array_get revisions tested: 2, total time: 25m51.295300689s (build: 18m28.881208003s, test: 6m30.32868556s) the crash still happens on HEAD commit msg: Linux 4.19.132 crash: general protection fault in flex_array_get sctp_inq_push+0x1aa/0x240 net/sctp/inqueue.c:95 sctp_backlog_rcv+0x1ac/0x1280 net/sctp/input.c:356 sk_backlog_rcv include/net/sock.h:946 [inline] __release_sock+0x10c/0x360 net/core/sock.c:2344 general protection fault: 0000 [#1] PREEMPT SMP KASAN release_sock+0x4f/0x180 net/core/sock.c:2860 CPU: 1 PID: 7395 Comm: syz-executor.0 Not tainted 4.19.132-syzkaller #0 sctp_wait_for_connect+0x22c/0x4c0 net/sctp/socket.c:8632 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:flex_array_get+0x23/0x240 lib/flex_array.c:320 Code: 90 90 90 90 90 90 90 48 b8 00 00 00 00 00 fc ff df 55 48 89 fa 48 89 e5 48 c1 ea 03 41 56 41 55 41 54 53 48 89 fb 48 83 ec 10 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 8d 01 00 00 44 8b 33 45 85 f6 RSP: 0018:ffff8880985c75a8 EFLAGS: 00010282 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffff11015072a06 sctp_sendmsg_to_asoc+0x10e8/0x15d0 net/sctp/socket.c:1986 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff8880985c75d8 R08: ffff8880985c7908 R09: ffffed1015d64732 R10: ffffed1015d64732 R11: ffff8880aeb23993 R12: ffff88809cfee6c0 R13: ffff888071701d04 R14: ffff8880a17e7b80 R15: 1ffff110139fddc1 FS: 00007ff880b75700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 sctp_sendmsg+0xd3f/0x1680 net/sctp/socket.c:2132 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000040 CR3: 0000000082cdb000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: inet_sendmsg+0x10d/0x450 net/ipv4/af_inet.c:798 sctp_stream_out include/net/sctp/structs.h:1474 [inline] sctp_sched_dequeue_done+0x1d8/0x300 net/sctp/stream_sched.c:255 __sctp_outq_teardown+0x660/0xc30 net/sctp/outqueue.c:267 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xb7/0xf0 net/socket.c:632 ___sys_sendmsg+0x649/0x950 net/socket.c:2115 sctp_outq_free+0x9/0x10 net/sctp/outqueue.c:291 sctp_association_free+0x1d5/0x711 net/sctp/associola.c:361 sctp_cmd_delete_tcb net/sctp/sm_sideeffect.c:944 [inline] sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1332 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1199 [inline] sctp_do_sm+0x989/0x4e50 net/sctp/sm_sideeffect.c:1170 __sys_sendmsg+0xd9/0x180 net/socket.c:2153 sctp_primitive_SHUTDOWN+0x7c/0xc0 net/sctp/primitive.c:104 sctp_close+0x354/0x750 net/sctp/socket.c:1560 __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2160 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458e29 inet_release+0xb9/0x1b0 net/ipv4/af_inet.c:427 Code: 2d b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 fb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 __sock_release+0xc7/0x2a0 net/socket.c:579 RSP: 002b:00007f90d9310c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e sock_close+0x10/0x20 net/socket.c:1140 RAX: ffffffffffffffda RBX: 00007f90d9310c90 RCX: 0000000000458e29 __fput+0x24c/0x7f0 fs/file_table.c:278 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000003 ____fput+0x9/0x10 fs/file_table.c:309 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 task_work_run+0x10e/0x190 kernel/task_work.c:113 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f90d93116d4 get_signal+0x13ba/0x1a30 kernel/signal.c:2399 R13: 00000000004c6075 R14: 00000000004da858 R15: 0000000000000005 do_signal+0x87/0x1960 arch/x86/kernel/signal.c:821 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 7402 Comm: syz-executor.5 Not tainted 4.19.132-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 exit_to_usermode_loop+0x114/0x200 arch/x86/entry/common.c:163 Call Trace: prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x419/0x4e0 arch/x86/entry/common.c:296 __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x123/0x177 lib/dump_stack.c:118 entry_SYSCALL_64_after_hwframe+0x49/0xbe fail_dump lib/fault-inject.c:51 [inline] should_fail.cold.4+0x5/0x13 lib/fault-inject.c:149 RIP: 0033:0x458e29 Code: 2d b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 fb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ff880b74c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: 000000000001fff8 RBX: 00007ff880b74c90 RCX: 0000000000458e29 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff880b756d4 R13: 00000000004c6075 R14: 00000000004da858 R15: 0000000000000005 Modules linked in: FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 __should_failslab+0xba/0xf0 mm/failslab.c:32 should_failslab+0x9/0x14 mm/slab_common.c:1558 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] kmem_cache_alloc+0x47/0x730 mm/slab.c:3557 kmem_cache_zalloc include/linux/slab.h:699 [inline] fill_pool lib/debugobjects.c:134 [inline] __debug_object_init+0x7dc/0xd70 lib/debugobjects.c:379 debug_object_init+0x16/0x20 lib/debugobjects.c:431 debug_timer_init kernel/time/timer.c:704 [inline] debug_init kernel/time/timer.c:757 [inline] init_timer_key+0x2e/0x270 kernel/time/timer.c:806 sctp_association_init net/sctp/associola.c:153 [inline] sctp_association_new+0x9fd/0x1ef0 net/sctp/associola.c:317 sctp_make_temp_asoc+0x8b/0x1a0 net/sctp/sm_make_chunk.c:1606 sctp_sf_do_unexpected_init.isra.37+0x66c/0x1400 net/sctp/sm_statefuns.c:1554 sctp_sf_do_5_2_1_siminit+0xf/0x20 net/sctp/sm_statefuns.c:1695 sctp_do_sm+0x112/0x4e50 net/sctp/sm_sideeffect.c:1167 sctp_assoc_bh_rcv+0x27f/0x5c0 net/sctp/associola.c:1073 sctp_inq_push+0x1aa/0x240 net/sctp/inqueue.c:95 sctp_backlog_rcv+0x1ac/0x1280 net/sctp/input.c:356 sk_backlog_rcv include/net/sock.h:946 [inline] __release_sock+0x10c/0x360 net/core/sock.c:2344 release_sock+0x4f/0x180 net/core/sock.c:2860 sctp_wait_for_connect+0x22c/0x4c0 net/sctp/socket.c:8632 sctp_sendmsg_to_asoc+0x10e8/0x15d0 net/sctp/socket.c:1986 sctp_sendmsg+0xd3f/0x1680 net/sctp/socket.c:2132 inet_sendmsg+0x10d/0x450 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xb7/0xf0 net/socket.c:632 ___sys_sendmsg+0x649/0x950 net/socket.c:2115 __sys_sendmsg+0xd9/0x180 net/socket.c:2153 __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2160 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458e29 Code: 2d b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 fb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fdbb04ddc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fdbb04ddc90 RCX: 0000000000458e29 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 ---[ end trace ccd9bf7bc7a82ded ]--- R10: 0000000000000000 R11: 0000000000000246 R12: 00007fdbb04de6d4 R13: 00000000004c6075 R14: 00000000004da858 R15: 0000000000000005 CPU: 1 PID: 7405 Comm: syz-executor.3 Tainted: G D 4.19.132-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x123/0x177 lib/dump_stack.c:118 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold.4+0x5/0x13 lib/fault-inject.c:149 __should_failslab+0xba/0xf0 mm/failslab.c:32 should_failslab+0x9/0x14 mm/slab_common.c:1558 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] kmem_cache_alloc_trace+0x4b/0x750 mm/slab.c:3623 kmalloc include/linux/slab.h:515 [inline] kzalloc include/linux/slab.h:709 [inline] flex_array_alloc+0x19e/0x270 lib/flex_array.c:105 fa_alloc+0x14/0x50 net/sctp/stream.c:46 sctp_stream_alloc_out+0x24/0x390 net/sctp/stream.c:159 sctp_stream_init+0xd9/0x330 net/sctp/stream.c:225 sctp_association_init net/sctp/associola.c:249 [inline] sctp_association_new+0x1143/0x1ef0 net/sctp/associola.c:317 sctp_make_temp_asoc+0x8b/0x1a0 net/sctp/sm_make_chunk.c:1606 sctp_sf_do_unexpected_init.isra.37+0x66c/0x1400 net/sctp/sm_statefuns.c:1554 sctp_sf_do_5_2_1_siminit+0xf/0x20 net/sctp/sm_statefuns.c:1695 sctp_do_sm+0x112/0x4e50 net/sctp/sm_sideeffect.c:1167 RIP: 0010:flex_array_get+0x23/0x240 lib/flex_array.c:320 Code: 90 90 90 90 90 90 90 48 b8 00 00 00 00 00 fc ff df 55 48 89 fa 48 89 e5 48 c1 ea 03 41 56 41 55 41 54 53 48 89 fb 48 83 ec 10 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 8d 01 00 00 44 8b 33 45 85 f6 RSP: 0018:ffff8880985c75a8 EFLAGS: 00010282 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffff11015072a06 sctp_assoc_bh_rcv+0x27f/0x5c0 net/sctp/associola.c:1073 sctp_inq_push+0x1aa/0x240 net/sctp/inqueue.c:95 sctp_backlog_rcv+0x1ac/0x1280 net/sctp/input.c:356 sk_backlog_rcv include/net/sock.h:946 [inline] __release_sock+0x10c/0x360 net/core/sock.c:2344 release_sock+0x4f/0x180 net/core/sock.c:2860 sctp_wait_for_connect+0x22c/0x4c0 net/sctp/socket.c:8632 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 sctp_sendmsg_to_asoc+0x10e8/0x15d0 net/sctp/socket.c:1986 RBP: ffff8880985c75d8 R08: ffff8880985c7908 R09: ffffed1015d64732 sctp_sendmsg+0xd3f/0x1680 net/sctp/socket.c:2132 inet_sendmsg+0x10d/0x450 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xb7/0xf0 net/socket.c:632 ___sys_sendmsg+0x649/0x950 net/socket.c:2115 R10: ffffed1015d64732 R11: ffff8880aeb23993 R12: ffff88809cfee6c0 R13: ffff888071701d04 R14: ffff8880a17e7b80 R15: 1ffff110139fddc1 FS: 00007ff880b75700(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f64da908018 CR3: 0000000082cdb000 CR4: 00000000001406f0 __sys_sendmsg+0xd9/0x180 net/socket.c:2153 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2160 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe