On 12/8/19 6:51 AM, Eric Dumazet wrote: > > > On 12/7/19 9:45 PM, syzbot wrote: >> Hello, >> >> syzbot found the following crash on: >> >> HEAD commit: bf929479 Merge branch 'for-linus' of git://git.kernel.org/.. >> git tree: upstream >> console output: https://syzkaller.appspot.com/x/log.txt?x=123e91e2e00000 >> kernel config: https://syzkaller.appspot.com/x/.config?x=874c75a332209d41 >> dashboard link: https://syzkaller.appspot.com/bug?extid=4b1fe8105f8044a26162 >> compiler: gcc (GCC) 9.0.0 20181231 (experimental) >> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=120faee2e00000 >> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=178a0ef6e00000 >> >> IMPORTANT: if you fix the bug, please add the following tag to the commit: >> Reported-by: syzbot+4b1fe8105f8044a26162@xxxxxxxxxxxxxxxxxxxxxxxxx >> >> BUG: memory leak >> unreferenced object 0xffff88812a4082a0 (size 48): >> comm "syz-executor670", pid 6989, jiffies 4294952355 (age 19.520s) >> hex dump (first 32 bytes): >> 00 00 00 00 00 00 00 00 01 46 00 00 03 00 00 00 .........F...... >> 00 00 00 00 00 00 00 00 00 6b 05 1f 81 88 ff ff .........k...... >> backtrace: >> [<000000002a74b343>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline] >> [<000000002a74b343>] slab_post_alloc_hook mm/slab.h:586 [inline] >> [<000000002a74b343>] slab_alloc mm/slab.c:3319 [inline] >> [<000000002a74b343>] kmem_cache_alloc+0x13f/0x2c0 mm/slab.c:3483 >> [<00000000fa370506>] fasync_alloc fs/fcntl.c:895 [inline] >> [<00000000fa370506>] fasync_add_entry fs/fcntl.c:953 [inline] >> [<00000000fa370506>] fasync_helper+0x37/0xa9 fs/fcntl.c:982 >> [<000000006c3eaaf1>] sock_fasync+0x4d/0xa0 net/socket.c:1293 >> [<0000000098076f55>] ioctl_fioasync fs/ioctl.c:550 [inline] >> [<0000000098076f55>] do_vfs_ioctl+0x409/0x810 fs/ioctl.c:655 >> [<00000000df24d2b9>] ksys_ioctl+0x86/0xb0 fs/ioctl.c:713 >> [<000000003fec9c80>] __do_sys_ioctl fs/ioctl.c:720 [inline] >> [<000000003fec9c80>] __se_sys_ioctl fs/ioctl.c:718 [inline] >> [<000000003fec9c80>] __x64_sys_ioctl+0x1e/0x30 fs/ioctl.c:718 >> [<000000002bebbfe6>] do_syscall_64+0x73/0x1f0 arch/x86/entry/common.c:290 >> [<00000000722d8431>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 >> >> BUG: memory leak >> unreferenced object 0xffff888128cdf240 (size 48): >> comm "syz-executor670", pid 6990, jiffies 4294952942 (age 13.650s) >> hex dump (first 32 bytes): >> 00 00 00 00 00 00 00 00 01 46 00 00 03 00 00 00 .........F...... >> 00 00 00 00 00 00 00 00 00 d8 02 19 81 88 ff ff ................ >> backtrace: >> [<000000002a74b343>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline] >> [<000000002a74b343>] slab_post_alloc_hook mm/slab.h:586 [inline] >> [<000000002a74b343>] slab_alloc mm/slab.c:3319 [inline] >> [<000000002a74b343>] kmem_cache_alloc+0x13f/0x2c0 mm/slab.c:3483 >> [<00000000fa370506>] fasync_alloc fs/fcntl.c:895 [inline] >> [<00000000fa370506>] fasync_add_entry fs/fcntl.c:953 [inline] >> [<00000000fa370506>] fasync_helper+0x37/0xa9 fs/fcntl.c:982 >> [<000000006c3eaaf1>] sock_fasync+0x4d/0xa0 net/socket.c:1293 >> [<0000000098076f55>] ioctl_fioasync fs/ioctl.c:550 [inline] >> [<0000000098076f55>] do_vfs_ioctl+0x409/0x810 fs/ioctl.c:655 >> [<00000000df24d2b9>] ksys_ioctl+0x86/0xb0 fs/ioctl.c:713 >> [<000000003fec9c80>] __do_sys_ioctl fs/ioctl.c:720 [inline] >> [<000000003fec9c80>] __se_sys_ioctl fs/ioctl.c:718 [inline] >> [<000000003fec9c80>] __x64_sys_ioctl+0x1e/0x30 fs/ioctl.c:718 >> [<000000002bebbfe6>] do_syscall_64+0x73/0x1f0 arch/x86/entry/common.c:290 >> [<00000000722d8431>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 >> >> BUG: memory leak >> unreferenced object 0xffff888128cdff60 (size 48): >> comm "syz-executor670", pid 6991, jiffies 4294953529 (age 7.780s) >> hex dump (first 32 bytes): >> 00 00 00 00 00 00 00 00 01 46 00 00 03 00 00 00 .........F...... >> 00 00 00 00 00 00 00 00 00 63 05 1f 81 88 ff ff .........c...... >> backtrace: >> [<000000002a74b343>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline] >> [<000000002a74b343>] slab_post_alloc_hook mm/slab.h:586 [inline] >> [<000000002a74b343>] slab_alloc mm/slab.c:3319 [inline] >> [<000000002a74b343>] kmem_cache_alloc+0x13f/0x2c0 mm/slab.c:3483 >> [<00000000fa370506>] fasync_alloc fs/fcntl.c:895 [inline] >> [<00000000fa370506>] fasync_add_entry fs/fcntl.c:953 [inline] >> [<00000000fa370506>] fasync_helper+0x37/0xa9 fs/fcntl.c:982 >> [<000000006c3eaaf1>] sock_fasync+0x4d/0xa0 net/socket.c:1293 >> [<0000000098076f55>] ioctl_fioasync fs/ioctl.c:550 [inline] >> [<0000000098076f55>] do_vfs_ioctl+0x409/0x810 fs/ioctl.c:655 >> [<00000000df24d2b9>] ksys_ioctl+0x86/0xb0 fs/ioctl.c:713 >> [<000000003fec9c80>] __do_sys_ioctl fs/ioctl.c:720 [inline] >> [<000000003fec9c80>] __se_sys_ioctl fs/ioctl.c:718 [inline] >> [<000000003fec9c80>] __x64_sys_ioctl+0x1e/0x30 fs/ioctl.c:718 >> [<000000002bebbfe6>] do_syscall_64+0x73/0x1f0 arch/x86/entry/common.c:290 >> [<00000000722d8431>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 >> >> >> >> --- >> This bug is generated by a bot. It may contain errors. >> See https://goo.gl/tpsmEJ for more information about syzbot. >> syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. >> >> syzbot will keep track of this bug report. See: >> https://goo.gl/tpsmEJ#status for how to communicate with syzbot. >> syzbot can test patches for this bug, for details see: >> https://goo.gl/tpsmEJ#testing-patche > > > AF_SMC bug it seems.... > > Repro does essentially : > > socket(AF_SMC, SOCK_STREAM, SMCPROTO_SMC) = 3 > ioctl(3, FIOASYNC, [-1]) = 0 > sendmsg(3, {msg_name=NULL, msg_namelen=0, msg_iov=NULL, msg_iovlen=0, msg_controllen=0, msg_flags=0}, MSG_FASTOPEN) > > > console logs : > > __sock_release: fasync list not empty! > > Indeed, it's an SMC-problem. We will take care about it. Thanks, Eric! Regards, Ursula Braun
